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Let’s start the New Year with some unfinished business from the old. A few weeks ago, a short video appeared in the Bug of the Week email inbox from a concerned friend assailed by a horde of suspicious looking insects swarming near the front of his home. Dark amber in color, hyaline wings, vast numbers of insects scrambled near the house and took flight. Sights like this strike fear in the hearts of wooden-framed home owners across much of our country. Could this be an infestation of the “invisible destroyers”, eastern subterranean termites? In the natural world, eastern subterranean termites live in underground nests and arise from the earth to forage on fallen trees. Remarkable creatures are these, with the ability to perform a digestive magic trick unparalleled in the human world. They consume wood. To utilize nutrients tied up in a biopolymer hard enough to dull an axe blade, most termites rely on symbiotic bacteria in their gut to digest the rugged plant material called cellulose. Some primitive species of termites enlist unicellular organisms called protozoa to accomplish this feat. Termites have an unusual and rather crude way of passing these vital microbes from one termite to the next. They employ a process known as proctodeal trophallaxis. One termite excretes a droplet of microbe-packed fluid from its anus. This packet of goodies is consumed by another termite waiting at the rear end. Yum! In addition to the transfer of vital symbionts from one termite to the next, trophallaxis is also a way of disseminating chemical messages called pheromones that regulate the development and behavior of termites within the colony. With the advent of domestic structures, termites have discovered a bountiful source of food provided by humankind. Termites colonize and establish residence within a home if conditions of moisture and temperatures suffice. They reach the structural wood of buildings by constructing tunnels of soil, wood, saliva, and excrement from an outdoor colony, which are built up the side of foundation walls until they reach the wood of a sill plate or floor joist. Then they enter the home. The appearance of swarming winged termites near a home may be the harbinger of problems down the road and the presence of swarming termites inside your home is a sure-fire indication of an infestation. Eastern subterranean termites are estimated to cause several billion dollars of loss annually associated with repairs, treatments, and prevention of infestations. Little wonder my friend was concerned.

Whoa, is this holiday visit a swarm of termites? Nope, citronella ants like these make an annual appearance at my home during December here in the DMV. Watch winged adults with narrow waists, forewings and hindwings that differ in size and shape, and elbowed antennae mill around before taking flight. A few wingless orange workers also stroll by. Termites like these infesting steps in my backyard usually swarm in spring. With thorax and abdomen broadly joined, forewings and hindwings similar in size and shape, and antennae resembling a string of beads, they are easy to distinguish from ants.  

Ah, but the holiday season is not the usual time of year eastern subterranean termites swarm throughout most of our land. Here in the DMV my home-grown termites make their flighted appearance in spring, as we saw in a previous episode. But what to my wondering eyes did appear two days before Christmas in this very year? Swarms of citronella ants. The appearance of winged citronella ants emerging from beneath my front sidewalk was a welcome surprise in this somewhat dismal season for observing insects and their kin in the DMV.  Ants often emerge from the earth and swarm to mate and found new colonies in warmer months in temperate regions. However, ants in the genus Lasius have been observed emerging from the earth in Maryland in late autumn and, at my home, in early winter. Lasius ants go by many colorful names including citronella ant, yellow ant, and lemon ant. The lemony scent we know as citronella owes to a compound found in many plants, including lemon, lemon grass, and several species of eucalyptus. Special glands near the jaws of Lasius ants produce aromatic lemon-scented citronellal. When threatened by an intruder, citronella ants send out an alarm by releasing citronellal. This pheromone brings nest mates running to assist in the defense of the colony. In addition to the well-known insect repellency of citronella, citronella ants have one more chemical trick up their sleeve, or should we say, in their rear end. Glands near the tip of the abdomen produce irritating formic acid. Formic acid contacting the eyes or face of an attacking predator serves as a powerful deterrent. This type of chemical warfare is an important strategy used by many species of ants. Fortunately, Lasius ants are not wood destroyers like their cousins the carpenter ants. In addition to hunting soft-bodied prey, Lasius are herders. Yes, that’s right, they actually shepherd root-feeding aphids, moving them from the roots of one plant to another to optimize the production of nutrient rich honeydew excreted by the aphids, upon which the ants feed.

Now returning to the plight of my insect-plagued friend, a quick look at his video soon gave me to know he had nothing to dread. Termites can be readily differentiated from ants by examining these features: shape of the antennae, width of the waist (in bug-speak, where the thorax joins the abdomen), and, for winged adults, the size and shape of the wings. Termites have simple antennae that look like a string of many beads. Ants have jointed antennae with a prominent elbow near the middle. Termites have a broad waist where thorax meets abdomen. Ants have a narrow, a.k.a. wasp-waist, where thorax meets abdomen. Termites have forewings and hindwings similar in size, shape, and texture with many fine small veins. Ants have large forewings, smaller hindwings, both with few prominent veins.

If you see swarms of insects emerging from the earth during this mild winter, fear not as these are likely citronella ants. Later in the year be on the lookout for termite swarms outside or inside the home. Using the information in this episode, we hope you will be able to tell these rascals from each other.

Acknowledgements

Inspiration for this episode came from my friend Mike who shared his video of citronella ants. We also mourn the passing of our friend and colleague E. O. Wilson, whose love of insects and the natural world inspired entomologists, biologists, conservationists, and naturalists around the world for more than six decades. As a youngster, Ed Wilson studied citronella ants in Rock Creek Park here in the DMV. The study of ants became his life-long passion and ants served as a model for our understanding of insect and human societies. We also thank my friend and colleague Dr. Barbara Thorne who studied termites under her life-long mentor and friend E. O. Wilson. Dr. Nancy Breisch, one of Dr. Thorne’s students, assisted in creating this episode.

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Identify Tiny Flying Bugs That are Often Found in Homes

The humidity and rich soil of the Northeast United States is welcoming to a wide range of flora and fauna — or plants and animals — including insects.

Insects such as small flies can easily enter a house or building unnoticed. Once inside, these seemingly harmless bugs can quickly grow into a troublesome infestation if allowed to multiply.

And it’s not just one type of tiny fly that tends to infiltrate the inside of a residence. The household pests that are most commonly found in New England homes include:

• Fungus Gnats: The tiny, mosquito-like flying bugs are attracted to moist soil. Buildings containing a lot of indoor plants may encounter swarms of fungus gnats.
• Fruit Flies: As the name implies, fruit flies gravitate towards rotten fruits, food waste, and residues.
• Drain Flies: Typically found breeding within a floor or sink drain, drain flies resemble miniature moths and thrive off of biosolids — the sludge that can build up on the sides of drain pipes.

While none of the small insects above are directly harmful to humans or animals, each one can transmit bacteria such as E. coli that can cause eye, skin, and diarrheal infections.

Having hordes of these tiny flying bugs swarming throughout a home or office can be a nightmare for any property owner. But as an indoor infestation of the disease-transmitting pests can occur at any time of year, vigilance is key.

For homeowners, learning how to identify the small flying bugs and understanding what attracts them to a house can be helpful in protecting a property from an infestation.

Fungus Gnats

Fungus gnats tend to infest the damp soil of potted plants in order to feed on the underlying roots or fungal growths.

The tiny flying bugs can easily be identified by the vein patterns on the wings and long legs.

Oftentimes, fungus gnats are brought indoors by way of an infected houseplant.

Identifying Fungus Gnats & Its Reproductive Cycle

The swarming bugs enjoy warm, moist climates. Spaces with indoor gardens or an abundance of houseplants and use heat lamps to stimulate growth can be paradises for fungus gnats to thrive.

A heat lamp can cause the area it illuminates to reach up to 80 degrees Fahrenheit while overwatered plants offer a bed of wet soil — both create perfect conditions for fungus gnats to repopulate.

Even more troublesome is how the insects congregate in large groups. Although swarming is a mating and survival strategy, it can also be an unsightly habit that makes fungus gnats easily visible.

The lifespan of a fungus gnat is only one month — just long enough to mate, reproduce, and in the case of female fungus gnats, lay eggs. A single female fungus gnat can lay up to 300 eggs in her lifetime.

These eggs are nestled on the surface of damp soil or can be found in the cracks of dry soil. The translucency and miniscule size of the ovular eggs make them difficult to spot until it’s too late.

In a mere three or four weeks, an indoor area can become infested with the tiny flying insects.

Upon reaching adulthood within 30 days, fungus gnats waste no time in forming sizeable swarms around light sources and windows.

Fruit Flies

Because of the farms and orchards scattered throughout the Northeastern region, fruit flies are a prevalent problem, particularly when the tiny flying bugs start invading the kitchen of a residential structure.

Attracted to rotting organic matter such as ripened fruits and fermenting vegetables, fruit fly populations can increase during the late summer and into early fall.

As an indoor household pest however, fruit flies are a year-round issue.

The tiny flies can typically be spotted near bowls of fruit, uncorked wine bottles, disposals, compost piles, and trash cans.

Basically, anywhere there is decaying food or residue is an ideal breeding ground for fruit flies.

Identifying Fruit Flies & Its Breeding Habits

Fruit flies essentially look similar to house flies, albeit much smaller in size. Coloring can range from black and brown to red.

Aside from decomposing organic materials, fruit flies can also survive in sludge-filled drain pipes and sewage lines. And even though fruit flies only live for a few weeks, the numbers of the pest remain high.

This is due to the fact that fruit flies can persist in variable conditions — from temperatures that are as low as 60 degrees Fahrenheit to as high as 85 degrees Fahrenheit.

The average temperature for most homes is approximately between 68 and 75 degrees Fahrenheit — a livable climate for fruit flies.

These insects are avid reproducers — one female fruit fly can lay up to 500 eggs during her lifespan. So, if homeowners start to see the tiny flies flitting about the home or office, they should be alarmed.

Drain Flies

Flies of any kind are unpleasant. But when the bugs come flying out of a drain, it makes the pests even eerier —a reality that those dealing with a drain fly infestation know all too well.

Also referred to as moth flies for their close resemblance, drain flies favor rooms with drains — kitchens, bathrooms, and basements being most popular.

But appliances that produce condensation such as air conditioners or objects containing stagnant water like pools or water bowls for pets are just as enticing.

Drain flies lay and store eggs in condensed, moist spaces where sludge or gelatinous slime forms. The bacteria, algae, and fungi that grow within these biosolids give drain flies nutrients.

Identifying Drain Fly Behavior & Mating Practices

Drain flies have a distinctive look — unlike fruit flies and gnats, the bugs possess thick, fuzzy bodies and antennae that set them apart from other kinds of flies that are commonly found in a home.

An adult drain fly only lives for an average of two weeks and makes the most of that time by reproducing at a break-neck pace. Full-grown female drain flies can lay anywhere between 30 to 100 eggs while alive.

Remove Household Pests with Catseye

Regardless of the type of household pest plaguing your indoor space, the seasoned professionals at Catseye Pest Control are prepared to design failsafe solutions and prevent reinfestation.

Through Catseye’s Fly Control and Removal program, household pests are targeted at every stage of development — eggs, larvae, pupae, and adult flies or gnats and all breeding sites are destroyed.

Because of the meticulous care put into every removal project, those who choose Catseye can take back control of their property with confidence.

To learn more about how the team at Catseye delivers foolproof pest management services to any property or to schedule a free inspection, contact us today.

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As the often-dreary days winter set in, you may be missing the antics and beauty of insects here in the DMV. Let’s take a quick trip to warmer climes to visit some gorgeous butterflies, longwinged heliconiids. Let’s head to Florida where several heliconiids reside or visit. 

First on the list is the remarkable Zebra Longwinged butterfly, Heliconius charitonia. These beauties live up to six months. Zebras and their kin evolved an interesting strategy to gather nutritious pollen used to sustain their unusual longevity. Zebras fly a well-defined route through the forest visiting trusty plants presenting fresh pollen-laden blossoms each day. This fixed-route behavior is called traplining and is employed by many tropical pollinators including bees, hummingbirds, and bats. After collecting a gob of pollen on its long, coiled proboscis, the butterfly secretes specialized enzymes to release the amino acids and other nutrients in the pollen. Nutrients absorbed through the membranes lining the proboscis are used to produce eggs and maintain the high level of activity required to zoom about the forest. 

In addition to visiting flowers laden with pollen, the Zebra also searches for different species of plants in the passion vine genus, Passiflora. These tropical vines bear the magnificent passion flower. Several species of passion vine are used by the immature stages of the zebra and other heliconiid butterflies as a source of food. These larvae are voracious caterpillars and consume great quantities of leafy tissue on a daily basis. As a group, passion fruit plants are protected from most leaf-munching caterpillars and other vegan insects by a veritable witch’s brew of highly toxic chemicals including alkaloids, a family of toxins that includes strychnine and nicotine, and cyanogenic glycosides, chemicals that release cyanide upon entering the digestive tract of a caterpillar or human. 

However, members of the heliconiid clan, including the zebra longwing and the gorgeous Gulf Fritillary, turn the tables on passion fruit plants, bypassing the noxious defenses, and feasting with impunity on their leaves. Some longwings sequester cyanogenic glycosides from their food and others manufacture these compounds on their own, presumably for defense. The striking orange and black coloration of the Gulf Fritillary warns vertebrate predators not to mess with this beauty. In addition to any plant derived defenses, the Gulf Fritillary has one more bit of chemical trickery to help keep predators at bay. Glands on the abdomen produce and release a concoction of complex esters when the adult butterfly is disturbed. This stinky defensive fluid dissuades predators such as birds from making a meal of these dazzling butterflies. 

This very hungry caterpillar turns into the beautiful Zebra Longwing, with banded wing patterns resembling those of a zebra. In the Amazon Basin you might see the stunning Sara Longwing with striking white chevrons on its iridescent blue-black wings. In Central America and the southern tier of the United States, brilliant orange, black, and white Gulf Fritillaries sip nectar and collect pollen from a variety of plants.

With so much leaf-munching by the larvae of heliconiids, one wonders how the vines of Passiflora survive. It seems that the mobile and eagle-eyed butterflies locate passion-vine plants by the shape of their leaves. To fool these clever herbivores, tropical passion-vines have evolved leaves that vary dramatically in shape. In this way it is more difficult for butterflies to zero in on any one leaf shape as they search for food for their young. At least one species of Passiflora has taken this game of deception one step further. It has evolved a small structure on the tips of its leaves resembling the egg of a Heliconius butterfly. Larvae of Heliconius are known to be cannibalistic and female butterflies may avoid placing eggs on a leaf if it is already occupied by another caterpillar or by an egg about to hatch. By creating a structure that resembles an egg, the passion-vine hangs a sign that says “no vacancy” to the female butterfly looking for a spot to lay eggs. This remarkable act of mimicry helps the passion vine escape the ravages of very hungry caterpillars. 

Bug of the Week wishes you Happy Holidays and a Joyous and Healthy New Year!

 

 

Acknowledgements

References used in the preparation of this Bug of the Week include “Caterpillars of Eastern North America” by David L. Wagner;  “Coevolution of Animals and Plants” by Lawrence Gilbert and Peter Raven; “Gulf Fritillary Butterfly, Agraulis vanillae (Linnaeus)(Insecta: Lepidoptera: Nymphalidae)” by Jaret C. Daniels; and “Novel chemistry of abdominal defensive glands of nymphalid butterfly Agraulis vanilla” by Gary N. Ross,  Henry M. Fales, Helen A. Lloyd, Tappey Jones, Edward A. Sokoloski, Kimberly Marshall-Batty, and Murray S. Blum; “Passiflora (Passifloraceae) defenses against Heliconius cydno (Nymphalidae: Heliconiinae) oviposition” by Kim Khuc and “Heliconius Homepage” https://www.heliconius.org/biology/ecology/

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This week we dive into the Bug of the Week mailbag to learn about some fantastic aphids discovered on limbs of a beautiful oak tree near the Chesapeake Bay.

‘Twas two weeks before Christmas and what did I see, But some giant bark aphids on a leafless shade tree. 

Aphids are not usually known for their very large size, But these babes on tree limbs win the “big-aphid” prize. 

As steadfast sap-suckers they spent several past weeks Sipping plant-sap from branches through stout hollow beaks. 

Aphid moms slurp sweet phloem by night and by day, And transform it to nymphs – born alive, by the way. 

These strange spawning efforts are quite something to see, Bug-geeks call this birth-trick viviparity.  

As autumn days wane and cold winds start to blow These gals change their game-plan. They just seem to know. 

No more birthing of youngsters on twigs in the cold, They lay eggs on tree branches, many thousand all told. 

Tiny black aphid eggs seem the perfect life stage To brave wicked winter when vicious storms rage. 

And if aphids can dream, their fond hope might just be That no hungry egg-eaters find their young on the tree. 

In this season of darkness of cold and of gloom Not far off is a season when trees start to bloom.

Cast off fear giant aphids, be glad and be happy! Next spring eggs will hatch when trees get all sappy. 

Through millions of years your plan has been true What more can be said? Happy holidays to you!

Braving icy winds and freezing temperatures, giant willow aphids try to squeeze in one more generation before Old Man Winter puts an end to their season.

Acknowledgements

 Bug of the Week extends apologies to Clement Clark Moore.  We also thank Dr. Catherine Carr for providing the inspiration and an image for this episode. Like woolly alder aphids, woolly beech aphids (aka beech blight aphids), and others we met in previous episodes, these aphids reproduce parthenogenetically, that is without males. To learn more about magnificent giant aphids on beech and willows, please visit the following websites:  

University of Florida Featured Creatures: giant bark aphid

InfluentialPoints.com: Tuberolachnus salignus, Giant willow aphid

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December 2021 will be remembered for many reasons, not the least of which is supply chain shortages that plague shoppers this holiday season. In addition to shortages of electronic devices and automobiles, choose-and-cut Christmas trees are somehow in short supply.  Ah, but my favorite trusty tree farm had no shortage of trees and, in what has become a regular event, my holiday tree had no shortage of spiders. This year my Nordmann fir had at least one tiny but very entertaining jumping spider.

Jumping spiders are unlike their cousins, the well-known orb weavers made famous by E. B. White in Charlotte’s Web. As their name implies, jumping spiders are hunters, relentlessly on the prowl for small insects and other spiders which they stalk, grab, subdue, and pulverize with powerful fangs. They are among the most intelligent of all arthropods. Their tiny brains are able to form spatial maps and plan circuitous routes to sneak up on unsuspecting prey. They are highly entertaining to watch as they explore their environment in search of prey. Their eight eyes, two of which are extraordinarily large, allow them to precisely track moving prey. Their mating rituals are spectacularly complex and rival those of vertebrates like Bower Birds. You can watch them hunt and court at this link: https://www.nationalgeographic.com/animals/article/160121-jumping-spiders-animals-science

After bringing a field-grown Christmas tree into the house, I found this little jumping spider touring my houseplants. Once the stare-down with the camera guy was finished, the spider continued its explorations. Watch how it takes a shortcut from one leaf to another at normal and one third speed, hence the name jumping spider!

Other spiders play important roles in the anthology of holiday trees and their decorations. Each year as we put the finishing touches on our holiday tree, a serious debate arises regarding the quantity of tinsel necessary to complete the task. Some years ago, I explored the murky origins of tinsel. To some, the silvery strands of unknown composition evoke images of glistening icicles or shimmering crystals of frost on evergreen branches. But how did tinsel become part of a holiday tradition in so many households? To aficionados of arachnids, the tradition of festive tinsel has several different origins. One Christian story tells of Mary’s harrowing escape from Roman soldiers as she and Jesus hid in the hills near Bethlehem. With Herod’s legion in hot pursuit, Mary entered a cave seeking refuge. Spiders quickly sealed the entrance with silk and when soldiers arrived and saw the undisturbed webs, they disregarded the cave as a hideaway and continued their search elsewhere. Often maligned spiders saved the day! Since that time, tinsel has been strung on Christmas trees to represent a glistening spider web and to commemorate the spider’s miraculous deed.

Other tinsel legends from Germany and the Ukraine tell of spiders escaping the lethal brooms of housekeepers by hiding in dark corners of the home during preparations for holiday celebrations.  After exiting their redoubts on Christmas Eve, spiders excitedly explored the evergreen trees that had been brought inside and then left behind glorious cloaks of gossamer webs. When Father Christmas arrived that night and saw the gray spider webs, he miraculously changed them into sparkling silver strands, much to the delight of families who viewed the trees on Christmas morning. Since that time, tinsel has been strung as a symbol of the remarkable event.

In the wild, jumping spiders prowl vegetation looking for prey and, apparently, amuse themselves by taking tiny bungee jumps from high places.

Many spiders survive winter’s chill as eggs protected in silken sacs. If the spider’s last haunt was a spruce or fir, then egg sacs may enter homes as stowaways on Christmas trees. In the warmth of holiday homes, eggs hatch and humans may be recipients of dozens of unexpected visitors. If you discover a spider egg sac on your Christmas tree or fresh evergreen boughs, simply pluck off a small piece of infested branch and place it and the egg sac outside on a shrub. This will allow the spiders to hatch just in time to deliver a deferred holiday gift of pest control in your garden. And as for my adorable jumping spider, well prey is scarce during winter months in my home. My spider was released on a hemlock where overwintering woolly adelgids may serve up a holiday treat for this clever hunter.

Acknowledgements

We thank the Maryland Christmas Tree Association for providing the inspiration for this episode. The fascinating article “The execution of planned detours by spider-eating predators” by Fiona R. Cross and Robert R. Jackson was used as a reference for this episode.

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By virtue of the intimate relationship between weather and insect activity, folklore abounds about the ability of insects to predict meteorological events – when hornets build their nests high, a cold winter is on the way, when ants construct tall mounds, heavy rains are just around the corner, stuff like that. An annual preoccupation for many naturalists is taking a guess at what Old Man Winter has in store for us in the upcoming months. Fact-packed sources like NOAA predict “above normal” temperatures for the mid-Atlantic region and the tried and true Old Farmer’s Almanac predicts a “Season of Shivers” with “positively bone-chilling, below-average temperatures across most of the United States”. Entomologists know the consummate soothsayer of upcoming winter weather is the banded woolly bear caterpillar, the larval stage of the Isabella tiger moth.

Exactly when and where the prognosticative abilities of woolly bears were discovered remains shrouded in mystery. However, Dr. Charles Howard Curran, an assistant curator at the American Museum of Natural History in New York City from 1947 until his retirement in 1960, popularized the forecasting skills of woolly bears. Dr. Curran made annual pilgrimages to nearby Bear Mountain Park each year between 1948 and 1956 to observe woolly bears and gather data on their color patterns. He measured the width of colored hair bands on the body of woolly bear caterpillars to forecast the severity of the upcoming winter. His observations gained notoriety when published in the New York Herald Tribune. He concluded that a wide orange or brown band in the middle of the caterpillar bordered by black bands at head and tail forecast a mild winter. Conversely, wider black segments with a narrow band of brown or orange in between forewarned of a long, severe winter. Several other entomological experts around the country have used various clues garnered from the woolly bears to predict the winter weather. Claims of 70-80% accuracy are not uncommon.

A woolly bear caterpillar bedecked with just a few black segments front and back, and many segments in the middle festooned with orange or brown is thought to be the harbinger of a mild winter. Conversely, a woolly bear with a narrow band of orange or brown sandwiched between large bands of black at head and tail signals a severe winter ahead. Having encountered representatives of both camps recently, perhaps the woolly bears are predicting a relatively mild winter with intermittent periods of severe cold. Clever meteorologists are these woolly bears.

I usually think of caterpillars as rather delicate creatures and wonder why woolly bears don’t spend winter in a more durable stage like an egg or pupa, as do many other moths and butterflies. Even in Maryland polar vortices sometimes visit and drop temperatures below zero. A fascinating study by Jack Layne and his colleagues revealed that woolly bear caterpillars survive winter’s cold through a process called supercooling. As temperatures drop in autumn and early winter, woolly bears and many other species of insects produce cryoprotectants, antifreeze-like compounds including glycerol and sorbitol, that prevent the formation of lethal ice crystals in their bodies. This brew of Mother Nature’s antifreeze allows caterpillars to survive even when ambient temperatures dip well below freezing. The ability to shrug off cold enables the partially grown woolly bear caterpillar to overwinter as a larva, and with the return of warm temperatures in spring and arrival of fresh leaves, the caterpillars resume feeding for a while before spinning a cocoon and completing the transformation to an adult moth.

Imagine my delight when on a recent trip to the field, I discovered a banded woolly bear caterpillar with virtually no black bands on its body save for a few dark segments near the head. What with wildly inflating fuel prices and my ancient furnace gulping gallons of fuel oil, the prospect of lower oil bills loomed large. These hopes were thoroughly dashed a week later when I spotted a banded woolly bear with but a few orange colored segments in the middle and wide black bands at head and tail sanctioning the Farmer’s Almanac forecast of severe weather ahead. Has discord so rampant in the world of humans spread to the realm of woolly bears as well? Let’s hope not. Perhaps these seemingly disparate meteorological predictions are reconciled like this: “Woolly bears are predicting a relatively mild winter with intermittent periods of severe cold.” Clever meteorologists are these woolly bears.

Acknowledgements

Bug of the Week thanks Sheri, Finn, and Iggy for inspiring this episode and Karin Burghardt for providing images and identifying featured caterpillars. David Wagner’s remarkable book, “Caterpillars of Eastern North America”, was used to prepare this story, as was the interesting article “Cold Hardiness of the Woolly Bear Caterpillar (Pyrrharctia isabella Lepidoptera: Arctiidae)” by Jack R. Layne, Jr., Christine L. Edgar, and Rebecca E. Medwith.

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Learn About the Damage Squirrels can Cause Each Year to Your Property & How to Prevent It

Squirrels may appear to be cute and harmless while scampering across your lawn — but the critter can actually cause quite a headache.

Residents and business owners in the Northeastern part of the United States may find their property littered with the quarter-sized holes squirrels dig in order to store food for winter.

Squirrel holes can be an eyesore and are generally an early sign that a scurry — or group of squirrels, has taken over the inside of the residence or building.

And even though these holes in the yard or garden might not cause a significant amount of damage, it could be an indication of a larger issue at hand.

In the Northeast, where winters are long and harsh, the region’s most prevalent squirrel species — the Eastern gray squirrel, the Southern flying squirrel, and the red squirrel, seek manmade structures for warmth.

These squirrels can take up residence in an attic or crawl spaces in a home or business, resulting in expensive infrastructural damage to the wiring, roof, siding, and insulation.

Homeowners and business owners should be aware of the affects a squirrel infestation can have on a property in addition to understanding how a nuisance wildlife management specialist can take care of the issue.

So, if you’ve spotted these quarter-sized holes in the landscape surrounding your home or office it’s essential to take action sooner rather than later as it can lead to significant damage for homeowners and business owners alike.

Why Do Squirrels Dig Holes in Your Yard?

The Northeast is home to tree-dwelling squirrels as opposed to ground squirrels, which are found on the west coast. This doesn’t mean, however, that a garden or lawn is completely safe from squirrel holes.

The holes that tree-dwelling squirrels dig in gardens or lawns are only an inch deep and typically no bigger than a coin — just large enough to store acorns, seeds, nuts, and other edible items.

Gray squirrels, Southern flying squirrels, and red squirrels create these food storage holes — called caches, in preparation for the lack of available food sources during the winter months.

Caches tend to pop up most frequently in the fall, from October to November.

For anyone that is trying to keep their lawn or garden looking picture-perfect, this can be an annoying trait — but squirrels do refill the caches with dirt. Likely, a lawn that’s been dug up by squirrels will be covered in these dirt-filled caches.

Because squirrel holes are so small and shallow, property owners don’t need to be concerned about irreparable or extensive harm to the outside. Generally, no long-term damage arises from squirrel holes in lawns or gardens.

In fact, the holes can actually help promote plant growth by naturally aerating the soil.

But squirrel holes in a yard or garden can be aesthetically unappealing and may indicate that a greater problem could soon arise — like squirrels infesting the inside of a home or business.

Manmade structures are particularly enticing to squirrels during the winter as the critters look for shelter from the cold.

Squirrels can access a home or building by using their teeth and claws to gnaw holes through drywall and roofing, then build nests in the attic or crawlspaces.

It can be quite costly to repair squirrel damage found in a home, business, or other structure. Reinsulating an attic after it has been destroyed by nesting squirrels can cost upwards of $1,500 or more — depending on the size of the attic.

A property that is facing a squirrel infestation can face extensive — not to mention unsightly, damage. This situation can be a true nightmare for any homeowner or business owner.  

To prevent squirrels from digging holes or causing damage to the home or business, it’s important for property owners to understand how to keep them at bay until a professional can come resolve the issue.

Prevent Squirrels from Digging Up a Lawn & Garden

If a property owner suspects squirrels have infested the area, they should immediately contact a licensed pest and nuisance wildlife expert for help.

It’s not only inadvisable but also dangerous for untrained individuals to confront a squirrel infestation. Squirrels can spread diseases such as salmonella and leptospirosis — a disease that can cause liver damage in people or animals.

Although rare, squirrels can also carry rabies. A single bite from an infected squirrel can result in severe or even fatal health complications, including intense muscle spasms and paralysis.

Leaving the removal of a squirrel infestation to the professionals is the best way to ensure the problem is taken care of the first time.

But until a pest and nuisance wildlife technician can arrive, there are some simple measures property owners can take to prevent squirrels from causing further damage to a garden, yard, or landscaping.

The best way to keep squirrels at bay while waiting for a pest and nuisance wildlife expert to come is to eliminate any available food sources found throughout the property.  

This includes securing garbage can lids, barring off compost piles, taking down bird feeders with accessible birdseed, and quickly removing fallen nuts, seeds, or fruits.

Noisemakers like bells or windchimes can also scare squirrels away or deter them from returning to the area. It may also help to seal off any potential points of entry like open attic windows or roof vents.

Spraying essential oils — like peppermint, or mixtures of chili peppers and mint around the property can help to repel squirrels. These temporary solutions can be beneficial as the nuisance wildlife animal tends to dislike smelling or tasting such substances.

To discourage squirrels from digging holes and stealing seedlings, crops, or flower bulbs that are buried underneath the surface, install netting or fencing around the perimeters of flowerbeds and gardens.

While such preventative measures may not completely eliminate a squirrel infestation, it can help to temporarily control the situation.

Keep Squirrels Out with Professional Help

Ensuring squirrels remain outside of your house or business is a worthwhile investment, especially as winter approaches and squirrels are searching for warmth.

But this is not a job for non-professionals. It’s essential for individuals with properties that are struggling with a scurry or infestation to seek a pest and nuisance wildlife expert to safely remove the critters.

Those who lack the proper training risk exposing themselves and others to the harmful bacteria squirrels can carry should they attempt to confront a squirrel infestation alone.

And as untrained individuals don’t possess the education or tools to effectively handle a squirrel infestation, the chance of recurrence increases significantly.

Pest and nuisance wildlife control specialists at Catseye Pest Control can remove the squirrels in addition to creating and installing customized, manmade barriers that can shield a structure from squirrels or other nuisance wildlife.

These barriers, known as Cat-Guard Exclusion Systems, are tailored to fit the needs of a variety of areas and points of entry for nuisance wildlife.

The areas of a structure most vulnerable to squirrels includes eaves, soffits, wire chases, vents, attic windows, and piping.

Through professional pest management services like Catseye’s Cat-Guard program, owners can enjoy their property without being concerned about a pest or nuisance wildlife infestation.

Expert Squirrel Control & Removal with Catseye

Sharing a space with a scurry of squirrels is a terrible thought for any homeowner or business owner.

Keep your property protected from squirrels and other nuisance wildlife with the help of Catseye’s comprehensive squirrel control program.

Under this program, our pest and nuisance wildlife control specialists will conduct a thorough inspection of the affected area(s) in order to determine how the squirrels are accessing the property.

From there, tailor-made solutions are designed to get and keep squirrels — and other nuisance wildlife, outside where they belong.

Once the squirrels have been removed, a nuisance wildlife clean-up crew will return the affected area(s) to its former, non-infested state.

Allow the expert pest and nuisance wildlife control technicians at Catseye to help you regain and retain control of your property — whether it’s your home, business, or another structure. Contact us to schedule a free inspection today.

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During the last week or so numerous reports of home invasions by lady beetles have surfaced with a modicum of confusion about what these creatures are. Misleading headlines like “Ladybug lookalike invading area homes” surfaced. For starters, let’s untangle the moniker thing. The beetles invading homes in many parts of the country during this season belong to a family of beetles called the Coccinellidae. These beetles go by many names – ladybugs, lady beetles, lady bird beetles – and are among the most common beetles in the US. All of these names refer to members of the coccinellid clan, a clade some 5,000 species strong worldwide. The term “ladybug lookalikes” really doesn’t make too much sense as ladybugs and lady beetles are different names for the same group of insects.    

Lady beetles, also known as ladybugs and lady bird beetles, are members of a clan more than 5,000 species strong. Many species are important predators helping to reduce pest populations in gardens, landscapes, and crops. The Multicolored Asian Lady beetle, Harmonia axyridis, is a common home invader in autumn throughout much of North America. It seeks overwintering sites in human-made structures. In natural settings, large aggregations form on rocky outcroppings of mountains where they survive winter’s ire. Harmonia was very abundant in parts of the DMV this year, which caused quite a stir with the public.

The petite invaders recently seen on homes, schools, and office buildings throughout the DMV and in many parts of the country are multicolored Asian lady beetles (a.k.a. Halloween lady beetle) seeking winter refuge. Harmonia axyridis is a prodigious killer of aphids and other nasty pests in our gardens. In one grove of shrubs, I witnessed the annihilation of a booming aphid population. The dazzling lady beetle adults and their alligator-like spawn so completely attacked their prey that I could not find a single living aphid a couple of weeks after Harmonia discovered the aphid patch. Harmonia adults have been reported to consume more than 250 aphids each day, and a single larva may eat more than 1,200 during its development. In addition to eating large numbers of aphids, they devour other pests including adelgids, scales insects, and psyllids.

The alligator-like larva of Harmonia may consume more than 1200 aphids during its development.

Like many predators, they also eat each other. In fact, Harmonia has been implicated in declines of indigenous lady beetle populations on oceanic islands where it has been introduced. As early as 1916, deliberate attempts were made to introduce Harmonia axyridis into the United States from their aboriginal home in Asia, to control aphids. We are not exactly sure how or when this lady beetle established, but by the mid-1980s, it was firmly entrenched in the southern United States. By 1993, it was reported in several Mid-Atlantic States, including Maryland. It is now distributed from Florida to Washington State. Reports of people being “bitten” by ladybugs abound and I confess that I have gotten a small nip from Harmonia every now and then. A recent study discovered that these tiny awesome predators, especially smaller native species of lady beetles, do indeed bite humans and in some cases drink mammalian blood under laboratory conditions. Yikes! Before you duck and cover your jugglers, take solace in the knowledge that Harmonia exhibited no tendency to drink blood.

There are a couple of cautions you might heed as you deal with home-invading lady beetles. When handled or disturbed, lady beetles can release a smelly, bitter secretion that may leave a faint yellow stain on your skin, wall, or curtain. The secretion is a witches’ brew of alkaloids and methoxypyrazines, potent feeding deterrents for would-be predators of lady beetles. There have been reports of pets, particularly dogs, eating lady beetles and becoming ill, so please remind Fido that these are not cicadas and don’t let him eat lady beetles.

Why are there so many lady beetles and what is the fascination with them invading our homes? Remember, these are predators and like many of the other members of their guild, when prey populations increase, populations of predators often follow. With abundant rainfall and lush plant growth providing food for aphids and other juicy prey this spring and summer, it appears that lady beetles had great success finding food, which elevated their survival and reproduction.

Are these lady beetles simply nosey or are we next on the menu now that the aphids are gone? As winter approaches, Harmonia seek protected locations such as crevices and cracks in rocky cliffs and outcroppings to escape the ravages of winter. Throughout the cities and suburbs of the DMV rocky cliffs are scarce, but homes and buildings are plentiful. Like the brown marmorated stink bug we met in previous episodes, this is the time that Harmonia fly to human-made structures and attempt to find refuge. Any cracks around windows, breaks in stone foundations, unscreened vents in the attic, or gaps in facer boards can allow entry into your home. Once inside the beetles settle-in and become dormant for the winter. Many will dehydrate or starve to death indoors, but on warm days in the late winter and early spring survivors may become active and find their way to sunny windows, where they attempt to escape. To prevent lady beetles and other invaders from entering your home, repair screens on your windows and vents, caulk your foundation, seal air conditioners, and eliminate points of entry to your home. Not only will this keep invaders out, but it will also help keep warm air in and reduce your heating costs. If you find the beetles are a problem indoors, carefully sweep or vacuum them up and release them in a protected spot outdoors such as a tool shed or wood pile.

One of the real delights of the season is to visit nearby summits such as the rocky crags of Old Rag Mountain in Virginia or Sugarloaf Mountain in Maryland to witness legions of multicolored Asian ladybeetles gathering on the sunny cliffs for one last bask in the sun before turning in for the winter. But you better hurry. The arrival of the multicolored Asian lady beetle is a sure sign that Old Man Winter is just around the corner.

Acknowledgements

Bug of the Week thanks Kevin Ambrose whose recent account of Harmonia in the Washington Post provided the inspiration for this episode. The interesting study by Sam Ramsey and John Losey entitled “Why is Harmonia axyridis the culprit in coccinellid biting incidents? “, “The chemical ecology of Harmonia axyridis” by John J. Sloggett, Alexandra Magro, François J. Verheggen, Jean-Louis Hemptinne, William D. Hutchison, and Eric W. Riddick, and “Multicolored Asian Lady Beetle” by Joe Boggs and Susan Jones were consulted to prepare this article.

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Autumn is the perfect season to explore Appalachian hiking trails and enjoy spectacular changes in foliage color as deciduous trees prepare to drop their leaves in preparation of winter’s chill. On a recent adventure to Savage River State Forest in Garrett County, Maryland, the westernmost county in the Free State, Fagus grandifolia, American beech, displayed its full glory sporting leaves of russet and gold. As I walked trails lined with these forest monarchs, I was surprised to see the usually unblemished smooth gray beech bark covered with cascades of fluffy white wax. Flocculant wax on leaves or bark is usually a bad sign, as it signals an infestation of some type of noxious sucking insect pest. Yes, this was indeed the case for our friends the American beech, who are in a mortal battle with an invasive insect pest from Europe called beech bark scale and a cabal of invasive fungal pathogens in the genus Neonectria. Together these aggressive pests cause a slowly developing but often lethal disease known as Beech Bark Disease, or BBD.

Beech bark scale belongs to a family of sucking insects called Eriococcidae. This rascal was identified as a pest of European beech trees in the mid-1800’s and was introduced into Nova Scotia in the 1890’s. Since then, it has spread throughout the range of American beech trees in eastern North America. Both adult and juvenile (nymph) beech bark scale insects insert tiny sucking mouthparts into nutritious cells beneath the outer bark of the tree. These stylets pierce and kill underlying cells. As thousands of scales feed, tissues beneath the bark die and bark cracks form. This allows the spores of Neonectria to enter the tree, multiply, and produce eruptive bark cankers, further spreading the fungus. The combined injury caused by thousands of scale insects bursting cells and fungi killing tissues beneath the bark eventually girdle the tree, resulting in a spiraling cycle of death that may take several years to kill their host.

White fluffy wax on the trunk of American beech trees is a good indication of an infestation of beech bark scale. Beneath the wax, tiny nymphs dormant throughout late fall and winter will resume feeding and develop into adults in the warmth of spring and summer next year. As thousands of adults and nymphs feed through the bark, their wounds allow fungal pathogens to enter, multiply, and produce a disease called beech bark disease (BBD). Over the span of several years, BBD can be lethal to infected trees.

In a strange evolutionary twist that we have seen in other insects like beech blight aphids and some scale insects, beech bark scales are parthenogenic, meaning female scale insects skip the business of romance and reproduce without the service of males. These nasty girls rule! Inside their fluffy bundles of wax, nymphs pass the winter months and resume development when spring returns. Wingless adults are present in June and July and new batches of eggs are deposited that will later hatch into mobile nymphs called crawlers. Ok, if adults are wingless how is it that they have spread from Nova Scotia in the 1890’s to western Maryland between 2010 and 2015? Tiny crawlers hatch from eggs and become windborne where they join aerial plankton capable of traveling untold distances on currents of wind. These tiny vagabonds may also crawl onto the feet of birds and be transported from one tree to another as birds migrate and stopover on trees along their route. Some evidence points to human-assisted travel as campers move vehicles around the country with nearly invisibly tiny vagabonds hitching a ride.

Is there any good news for our imperiled beech trees? Yes! Very cold temperatures around 30 degrees below zero Fahrenheit that occur in parts of the range of American beech can be lethal to overwintering scale insects. But in a warming world, this may not be all that helpful. Variation in susceptibility of beech trees to infestations provides hope that some trees carry genes conferring resistance to the scale insect and that resistant cultivars of beech can be bred. Lady beetles, including the twice stabbed lady beetle (gotta love that name), feed on adult and immature beech bark scales, and several insecticides are effective in killing these noxious pests. Insecticides can certainly help for specimen trees in managed landscapes but this tactic is not a solution for the vast stands of beech trees in natural settings. Perhaps Mother Nature has another trick up her sleeve to help quell this invader from overseas. Let’s hope so, but in the meantime take a moment to visit and enjoy American beech trees, remarkable sovereigns of the forest.

Acknowledgements

We thank Dr. Shrewsbury for spotting several beech trees in Savage River State Park. Several enlightening references were used to prepare this episode. They include “Beech bark disease in North America: Over a century of research revisited” by Jonathan A. Calea, Mariann T. Garrison-Johnston, Stephen A. Tealec and John D. Castello, “ Beech Bark Disease” by Esther Kibbe and Enrico Bonello, and “Characterization of mating type genes in heterothallic Neonectria species, with emphasis on N. coccinea, N. ditissima, and N. faginata” by Cameron M. Stauder, Jeff R. Garnas, Eric W. Morrison and Catalina Salgado-Salazar.

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Autumn is a perilous time for many beneficial insects as they strive to collect food reserves to help them survive the approaching winter. In last week’s episode we watched honeybees taking advantage of an unusual source of food, honeydew produced by spotted lanternflies. Premier late season nectar sources for honeybees and many other beneficial insects are native goldenrods, brilliant members of the aster family widely distributed in North America. Rich in nectar and pollen, they help sustain many bees, wasps, and beetles preparing for winter. A few weeks ago, while visiting a favorite patch of goldenrod, I happened across a couple of very cute flies sporting orange and black bodies and feathery hind legs. These belong to a clan of parasitic flies known as tachinids. Some tachinids attack caterpillars, including the nefarious gypsy moth caterpillar, but feather-legged flies have a penchant for members of the “true bug” clan, insects with sucking mouthparts and immature stages called nymphs. Included in this clan are some very bad performers including the brown marmorated stink bug.

Goldenrods are super attractors for many beneficial insects, including feather-legged flies. Flies deposit eggs on many true bugs, like this hapless native leaffooted bug. Eggs hatch and fly larvae bore into the host to develop. With development complete they exit, drop to the ground and pupate in the soil. Adults emerge from the soil to feed, mate, and find new bugs to parasitize. They are known to attack invasive pests, including the nefarious brown marmorated stink bug.

As with many other tachinids, female Tricopoda flies seek hosts on which to deposit their eggs. Stink bugs, squash bugs, leaffooted bugs, and other true bugs are on the hit list. Upon hatching from the egg, tiny fly larvae drill their way through their egg shell and then through the outer skin of their buggy host. Inside their host they develop on the bug’s nutrient rich tissues. Once larval development is complete, maggots bore their way out of the host and drop to the soil below. A pupa forms within the skin of the final stage of the maggot and from this puparium the adult fly emerges ready to find food and a mate. As you might guess, hosts usually succumb to this parasitic invasion.

But how do these smallish flies find their hosts? Insects communicate in a variety of ways using sight, sound, and volatile chemicals to find and join other members of their species. Chemicals used for communication by members of the same species are called pheromones. In a series of fascinating studies, Jeff Aldrich and his colleagues discovered how these parasitic flies locate their victims. Many species of true bugs produce pheromones that serve as assembly calls for purposes of mating or defense. Tachinids use these aggregation pheromones for their own mischievous purpose, to find hosts that will serve as food for their parasitic offspring. While this tale may seem a little dark, the good news here is that native Trichopoda flies have joined other allies, including wheel bugs, garden spiders, robber flies, mantises, and wasps to stymie the shenanigans of invasive pests including the brown marmorated stink bug.      

Acknowledgements

The intriguing references “The biology of Trichopoda pennipes Fab. (Diptera, Tachinidae), a parasite of the common squash bug by Harlan Worthley, “Bug pheromones (Hemiptera, Heteroptera) and tachinid fly host-finding” by Jeff Aldrich, Ashot Khrimian, Aijun Zhang, and Peter Sherer, and “Parasitism of the Invasive Brown Marmorated Stink Bug, Halyomorpha halys (Hemiptera: Pentatomidae), by the Native Parasitoid, Trichopoda pennipes (Diptera: Tachinidae)” by Neelendra K. Joshi, Timothy W. Leslie, and David J. Biddinger were used to prepare this episode.

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