Evergreen Bagworm

Thyridopteryx ephemeraeformis

Evergreen Bagworm on planted Juniper

The Evergreen Bagworm (Thyridopteryx ephemeraeformis) is an interesting larva. It lives in a silken bag that it carries around. In the summer, you can see its head peeking out as it feeds. It overwinters as eggs in one of these silk bags, attached to a twig. Red-cedar (Juniperus sp.) and Arbor Vitae (Thuja occidentalis) are its favorite food but it will eat Pines (Pinus sp.), Spruce (Picea sp.), Willow (Salix sp.), Maple (Acer sp.), Cherry (Prunus sp.) and other woody plants. Bits of leaf and twig from the host plant decorate its bag.

Thyridopteryx ephemeraeformis

Bagworm cases on Juniper with surface close-up

Only the male moth leaves the safety of his bag to fly in search of females in their bags. Wingless and legless, the female lays approximately 1000 eggs in her bag then leaves it, falling to the ground to die. Overwintering as eggs, the larva hatch in late spring and begin to build their own bag homes. In late summer they pupate, emerging 4 weeks later as adult moths.

Thyridopteryx ephemeraeformi

Bagworm cases on ornamental cherry with surface close-up

I opened two bags this winter expecting to find eggs. I found a dead female moth in one and a pupa in the other. According to every book and website I consulted, they overwinter as eggs. Both of my stations are on ornamental plantings and might have been sprayed. I need to find a natural colony to observe.

Copyright 2014 by Donald Drife

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Wasp Mantidfly

Wasp Mantid Fly

Wasp Mantid Fly

The Wasp Mantidfly (Climaciella brunnea) is an insect that looks like a cross between a Praying Mantis and a Polistes Wasp. It is not related to either but is in the order Neuroptera along with the Common Lacewing and the Antlion.

Wasp Mantid fly profile

Wasp Mantid fly profile

Like the Praying Mantis it uses its front legs to catch other insects. I found it on a Common Milkweed hunting insects visiting the flowers. It is reported to feed on nectar.

The adults last only about a month. They lay several thousand short stalked eggs that hang under plant leaves looking like pins with heads. After hatching, the larva drops onto a passing spider and waits for it to lay its eggs. The larva enters the spiders egg mass and feeds on the eggs. This particular species of Mantidfly develops on Wolf Spider eggs.

I have only found one Mantidfly. It was near Grayling, Michigan along my favorite mile of road. They are widespread in Michigan but short lived. This is a species that I will look for in the future.
Copyright 2014 by Donald Drife

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Happy Groundhog Day

Marmota monax Woodchuck

Woodchuck

The first Groundhog Day at Gobbler’s Knob, Punxsutawney, Pennsylvania, was celebrated February 2, 1887. The day was celebrated elsewhere earlier and traces its tradition back to Candlemas Day. At a special church service (a Mass), the church would bless candles. The candles indicated how long the winter would be. Germans added a hedgehog as a weather predictor and used a groundhog once they settled in America. See history.com for more information.

Woodchuck eating corn

Woodchuck eating corn

Groundhogs (Marmota monax) are also called Woodchucks or Whistle-pigs. They are in the Squirrel Family (Sciuridae) and occur throughout Michigan. They have two to nine young per year but the average is around four. The mother is protective of her young and will stand on her hind feet (or tent peg as I call it) and watch for danger.

A Woodchuck has lived under our deck for the 25 years we have lived in this house. My first encounter happened the first weekend we lived here. I was sitting on the ground, repairing the siding along the bottom of the garage. I felt a cold spot on the small of my back and jumped up yelling to my wife “It’s a Woodchuck.” The Woodchuck turned, whistled, and dove under the deck. I try not to anthropomorphize but I think the whistle meant, “It’s a human.”

Mother Woodchuck keeping watch

Mother Woodchuck keeping watch

Our resident Woodchuck has been a lone male or a female with young. Seven young is our record. I have seen a mother Woodchuck charge and tree a Raccoon that she thought was too close to one of her babies. We have a fence around our vegetable garden that they could dig under or just climb but that has never happened. They will eat wildflowers that grow in the yard. Different Woodchucks prefer different plants. Some years our Bellwort (Uvularia grandiflora) is fine, other years it is mowed flat. The adults leave certain plants alone such as the wild Iris, but the young will bite a mouthful or two to try it. The years we have young in our yard each species of plant gets bites taken from it. The young try to eat everything. Violet leaves and flowers are a favorite Woodchuck food. Lucky our “lawn” is filled with violets.

Two young woodchucks

Two young woodchucks

I have coexisted with our Woodchuck friends because they are entertaining to watch and they too need a place to live. Enjoy Groundhog Day but remember, no self-respecting Groundhog would be awake in Michigan on February 2nd.
Copyright 2014 by Donald Drife

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National Squirrel Appreciation Day

Sciurus niger Eastern Fox Squirrel

Eastern Fox Squirrel

January 21 is National Squirrel Appreciation Day. Christy Hargrove, a wildlife rehabilitator, began the celebration. Mid-winter is a time when food becomes hard to find for our squirrel friends, so she felt that it was a good time to focus some attention (and food) on them.

Michigan has five species of squirrels. Northern and Southern Flying Squirrels (Glaucomys sabrinus and G. volans) are nocturnal and shy. I hear them calling on dark nights and seldom see them. The most reliable way to distinguish the two flying squirrel species is by their teeth. Both species are recorded from Oakland Co., Michigan.

The other three squirrel species are well known and often observed. They are Eastern Fox Squirrel (Sciurus niger), the Eastern Gray Squirrel (Sciurus carolinensis) including the Black Squirrel, and the much smaller Red Squirrel (Tamiasciurus hudsonicus).

Sciurus niger  Eastern Fox Squirrel

Eastern Fox Squirrel

The Eastern Fox Squirrel is the largest of our Michigan squirrels, 50-56 cm. (20-22 inches) long and weighing between 680 and 1360 grams (1.5 and 3 lbs). It differs from our other squirrels by its size and yellowish brown, with some reddish color. There are some color variations, including individuals that are much paler than normal. I have seen pure white albinos with pink eyes. This species and the Eastern Gray Squirrel both build leafy nests in trees and will use cavities in trees for nesting as well.

Sciurus carolinensis     Eastern Gray Squirrel

Eastern Gray Squirrel grey morph

Sciurus carolinensis  Eastern Fox Squirrel

Eastern Gray Squirrel black morph (Black Squirrel)

Both gray and black squirrels in Michigan are members of a single species, the Eastern Gray Squirrel. Ranging from 41 to 51 cm. (16 to 20 inches) long, and weighing between 340 and 680 grams (.75 and 1.5 lbs), it is slightly smaller than the Eastern Fox Squirrel. The gray morph is dark to pale gray on the back, with a light gray or buff belly. Some of the black morph animals have blond tails or reddish coloring in places. Though they appear very different, the two color morphs are often present in one litter. According to the Animal Diversity Web entry for this species, the black color morph is more common in the northern part of the squirrel’s range. Black animals lose less heat and have a lower basal metabolic rate, which should give them a survival advantage in cold winter temperatures.

We now see many Gray Squirrels in both color morphs in our yard. When we first moved here 22 years ago, there were only Eastern Fox and an occasional Red Squirrel. The Gray Squirrel has spread into the area and become dominant over the Fox, even though it is smaller.

Tamiasciurus hudsonicus Red Squirrel

Red Squirrel

The last squirrel in our area is the Red Squirrel. It is small, 28 to 35 cm. (11 to 14 inches), with a reddish back, white underside and broken white eye-ring. Even though it is smaller, size matters not. It is aggressive, and can and will run off larger squirrels.

Get out and watch squirrels. They are fascinating. One of the Fox Squirrel photos shows a squirrel on a garbage can that contains sunflower seeds. It was pulling on the chain trying to break in. They sprawl out on our deck railings to cool off on a hot day. They fluff up their fur in the cold and hold their tails over their bodies in the rain or snow. They run and jump through the trees. They are just fun to watch. Have a happy NSAD.

Copyright 2014 by Donald Drife

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Michigan’s Spruces (Picea)

Spruces have needles less than 20mm (3/4 inch) long with square cross-sections. They never occur in bunches, just one needle per node. They can be confused with Balsam Fir (Abies balsamea) but Firs have needles with flattened cross-sections. If you can roll a needle in your fingertips then it is a spruce.

Balsam Fir and Spruce Needles and Branchlets

Balsam Fir and Spruce Needles and Branchlets

Michigan has two native spruces, Black Spruce (Picea mariana) and White Spruce (P. glauca). Norway Spruce (P. abies) is now naturalized into the state.

Picea mariana branchlets

Black Spruce Branchlets

Picea mariana pegs and cones

Black Spruce pegs and cones

Black Spruce has needles shorter than 16mm (5/8 inch) and densely pubescent, meaning furry, first year branchlets. The needle bases, which sit on a peg-like projection, are difficult to see. These peg-like projections stick out at 90 degrees to the twig. If cones are present, they are about as wide as they are long. In southern Michigan, Black Spruce grows only in cool bogs. North of Bay City, it will also grow in upland forests and interdunal swales. Even in the north, it prefers a damp habitat and often occurs with Tamarack (Larix laricina) and White Cedar (Thuja occidentalis). The common name refers to the dark needles this tree normally has.

Picea glauca needles and cone

White Spruce needles and cone

White Spruce has needles that are normally longer than 16mm (5/8 inch) and hairless first year branchlets. The needle bases are easily seen. The peg-like projections  point forward at approximately 60 degrees from the twig. Cones are two to three times longer than wide. The tree’s native range is north of West Branch. It grows in similar habitats as Black Spruce but will also thrive in drier locations. The common name refers to the waxy layer on the young needles.

Picea abies needles and cone

Norway Spruce needles and cone

The native range of Norway Spruce is central and northern Europe. It is escaping throughout Michigan. The branchlets droop and its cones are large, approximately 130mm (5 inch) long. Norway Spruce is commonly planted and beginning to escape into natural areas. Its needles are stiff and have rows of minute openings properly called stomata.

Picea abies stomata

Norway Spruce stomata

Copyright 2014 by Donald Drife

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Balsam Fir and Hemlock in Michigan

Balsam Fir and Spruce Needles and Branchlets

Balsam Fir and Spruce Needles and Branchlets

Balsam Fir, (Abies balsamea) is a common conifer in northern Michigan. It often grows with Aspen (Populus grandidentata & P. tremuloides), Jack Pine (Pinus banksiana), or Paper Birch (Betula papyrifera). It is also found in White Cedar (Thuja) swamps and bogs. Often the needles form flat branchlets but the needles can encircle a branch, resembling a spruce (Picea) branchlet. When I began to look for spruce trees to photograph I was surprised to find that many of the stands I thought were spruce actually were Balsam Fir with their needles encircling the twigs. Spruces have square needle cross-sections and Balsam Firs have rectangular cross-sections. The needle scar, that is the mark left on the twigs when the needle falls off, is round on the Balsam Fir. Its needles fall and leave a clean branch. Spruces leave rough projections along the branchlets after the needles fall. Balsam Firs tend to hold their dead needles on older branches and spruces shed their needles. Balsam Fir has distinctive pitch filled pockets under the surface of its bark.

Abies balsamea Branchlet and Bark

Balsam Fir Branchlet and Bark

Abies balsamea Balsam Fir Needles

Balsam Fir Needles

Although I spend much of my field time in the range of Balsam Fir, I seldom see it producing cones. Perhaps they are produced at the tops of tall firs and I miss them. The cones fall apart, dehisce is the technical term, while still attached to the branches, so no cones fall to the forest floor. I often see seedling Balsam Firs so they must be producing cones.

Tsuga canadensis Branchlet Stomata Cones

Eastern Hemlock Branchlet, Stomata, and Cones

Eastern Hemlock (Tsuga canadensis) is common north of Bay City and rarer in southern Michigan where it will grow in a protected hollow or ravine. In the north, it will grow with hardwood trees, White Pine, or in pure stands. Hartwick Pines State Park has an elevated, barrier free, “treetop” walkway leading into its Forest Center. The walkway leads through a nice Hemlock and American Beech (Fagus grandifolia) woods. I enjoy walking through the treetops and peering into the canopy. I photographed the Hemlock cones from this platform.

The needles are short, normally less than 13mm (1/2 inch), blunt, with a few teeth toward the tip. They are dark green above and have a white stripe on the lower surface. The white stripe is actually composed of minute openings in the leaf called stomata. These openings allow the plant to “breath.” Hemlocks also have needles that lay on the twig, with their lower surface pointing up. The needles appear to occur in flattened clusters but actually are produced from around the twig. The leaves bend, giving the branch its characteristic flattened look.

Copyright 2013 by Donald Drife

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Viburnum Leafhopper (Enchenopa viburni)

Enchenopa viburni  Viburnum Leafhopper

Viburnum Leafhopper adult

I found this thorn mimic leafhopper last September on my Korean Spice Viburnum (Viburnum carlesii). To my eye, it did not blend in at all on this thornless shrub. The white masses are its eggs. This species was first named as a scale insect from a mistaken idea that these were insects and not eggs. After the mistake was noticed, the name was transferred to this genus.

When I found the eggs last September they were white and sticky. It is now December and the eggs are still white and sticky even on days when it is 10 degrees F. Perhaps this stickiness discourages birds from eating the eggs. I have seen Black-capped Chickadees in this shrub and they don’t seem to bother the eggs. The egg masses now have pieces of leaves and other dirt adhering to their surface but the egg masses themselves are still white and easy to notice. I expected them to darken with age so they would blend into the viburnum twigs better.

Enchenopa viburni eggs L-September R-December

Viburnum Leafhopper eggs L-September R-December

I know as a gardener I should destroy the egg masses, but I have never observed this species before and the egg masses are few in number. I want to study and photograph the nymph stage. I will monitor the insects in the spring to insure they are not serious garden pests.
Copyright 2013 by Donald Drife

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Poison Ivy Rust (Pileolaria brevipes) in Michigan

Pileolaria brevipesToxicodendron radicans

Poison Ivy Rust

When I found this growth on a poison ivy vine in Tenhave Woods, Royal Oak, Michigan, I did not know if it was an insect gall, a fungus growth, or a rust. Because it was growing on Poison Ivy (Toxicodendron radicans sensu stricto) , I did not closely examine it. I searched the internet for “rust Toxicodendron radicans,” “rust Rhus radicans,”  and “galls” using both names with no luck. I studied the growths during the remainder of the summer and I was fairly certain that it was a rust.

I recently revisited the photos. Winter months are spent sorting and identifying photos. After searching the Internet for “rust poison ivy,” I found what looked like my poison ivy rust on Iowa State University’s Ada Herbarium website. It was under the name Pileolaria brevipes. This name lead me to an article by David Senchina titled “Fungal and animal associates of Toxicodendron spp. (Anacardiaceae) in North America” with photographs of my poison ivy rust.

Poison IvyPileolaria brevipesToxicodendron radicans Flowers  Rust on flowering Poison Ivy

Poison Ivy Rust on flowering Poison Ivy

Rusts are a small group of parasitic fungi consisting of approximately 7000 species worldwide. Somewhere around 175 species occur in Michigan. Rusts are so-named because their spores are often orange or reddish-brown. They can cause severe damage to important agricultural and timber crops.

Rust fungi have fascinating and complex lifecycles. They can have up to six different spore states during their lifecycle and may need two distinct host plants during their lifecycle (heteroecious) or a single species (autoecious). A rust species usually grows on a specific host species or group of species.

Here is a simplified Wheat Rust lifecycle. It is a heteroecious species with Wheat and Barberry serving as hosts. Wheat Rust over-winters in the soil as a thick-walled spore. They germinate in the spring and produce other spores of two strains (or sexes) that are carried by the wind to the upper surface of Barberry leaves. These grow and produce another type of spore that infects the lower surface of the leaf. From this growth, spores are produced that the wind carries to Wheat. When the rust grows on its Wheat host it produces spores that can directly infect other Wheat plants and then in the fall it produces the over-wintering spores. For a detailed life-cycle of the Wheat Rust and more information on rusts see the University of Hawaii’s Botany Department website.

Poison Ivy Rust’s lifecycle is simpler having just three spore types and a single host plant. It is widespread across most of North America.

There is no popular field guide for Michigan’s rust species. George Cummins and Yasuyuki Hiratsuka produced an Illustrated Genera of Rust Fungi allowing the identification of rust to genus using microscopic characters. My research for this blog has taught me that I see more rust species than I have previously noticed.
Copyright 2013 by Donald Drife

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Split Gill Fungus

Schizophyllum commune Split Gill Gills Dry (l) Gills Wet(r)

Split Gill Gills Dry (l) Gills Wet (r)

Split Gill Fungus (Schizophyllum commune) is one of the world’s most widely spread fungi. Occurring on six continents (except Antarctica), it grows anywhere that dead wood is found. John Raper of Harvard studied this fungus for many years and tried without success to divide it into additional species. The genus does contain a few other local species.

Schizophyllum commune Split Gill upper - lower Wet

Split Gill upper – lower Wet

The fruiting bodies are long lived and –in spite of their delicate appearance–can last several years. The gills roll back in dry weather, protecting their spores. David Arora in his book Mushrooms Demystified reports that a specimen was rehydrated and shed spores after being stored for 50-years in a tube. The split gills are distinctive, changing color and shape as they dry and are rehydrated. They radiate from a single point on the undersides of the small shelf-like fruiting bodies. The white to light-brown, hairy upper surface appears to be leathery and inrolls the lower surface.

Schizophyllum commune Split Gill upper - lower Dry

Split Gill upper – lower Dry

Split Gill fungus has over 28,000 different sexes. This encourages crossing with non-relative fungus. See Tom Volk’s excellent “Fungus of the Month” page for more details.

Schizophyllum commune Split Gill Dry

Split Gill Dry

I have seen this fungus in several locations in Michigan, and it can be found throughout the winter. Look for it on you winter walks. I thank “Mushroom Mary” for showing me my first specimens.

Schizophyllum commune Split Gill

Split Gill (ul) wet to (lr)dry

Copyright 2013 by Donald Drife

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Review: “The Kirtland’s Warbler”

William Rapai’s book The Kirtland’s Warbler: The Story of a Bird’s Fight against Extinction and the People Who Saved It covers the first 170-years of the Kirtland’s Warbler from the first specimen in 1841 through the 2010 warbler census. The University of Michigan Press is to be commended as it continues its tradition of providing sound scientific writings in a readable format. The known population has fluctuated from approximately 330 birds in 1974 and 1987 to over 3500 by 2010. After the 1987 census Doug Middleton (an amateur ornithologist) remarked to me that there were more Kirtland’s Warblers in museum cabinets that currently alive. Since the book was written the population has increased to over 4000 birds.

As I write this review, I sit in the heart of “Kirtland Country.” I am only 15 miles from where Norman Wood discovered the first Kirtland’s Warbler nest. A small plaque marks the location. Across the road is Doug Middleton’s stone cabin used for many years as a base for his studies of the Kirtland’s and other Crawford County warblers. I’m in the Jack Pine Plains and during the spring I often hear Kirtland’s Warblers singing.

Nathan Leopold was one of the first to study the Kirtland’s life history. Leopold is better known for the Leopold and Loeb murder in 1924. Before committing this crime, Leopold collected and had mounted a Kirtland’s nest, young, and a male and female adult bird. Through Doug Middleton’s intervention, this habitat study was presented to the Cranbrook Institute of Science and was on display for many years. I saw it numerous times as a boy.

Rapai documents several unique attempts to study the bird. Both Josselyn Van Tyne (curator of birds at the University of Michigan Museum of Zoology) and Harold Mayfield (another amateur ornithologist) attempted unsuccessfully to hand rear young birds. Another plan put forward was to trap the warblers and keep them in captivity each winter. This would remove the hazards of migration and the mortality on the wintering grounds but the plan was never implemented.

In 1971, the Kirtland’s Warbler Advisory Committee was formed. They recommended a Cowbird trapping program and a plan for managing Jack Pine habitat. These have been the keys to the bird’s recovery.

The tragic 1980 Mack Lake fire is also mentioned. Started as a “controlled burn” it lost containment, burning 20,000 acres and killing one firefighter. I walked the area of the fire a week after it burned helping to assess the plant life. I also helped to cut cross-sections of downed, dead trees to determine their ages. I visited the area several times over the next few years as the Jack Pine and other vegetation regenerated.

Rapai points out that the Robin is not technically Michigan’s State Bird and chronicles the attempts to name the Kirtland’s Warbler as the state bird. The Robin was designated the “state bird” via a non-binding resolution and retains that status largely because of tradition.

Rapai mentions the past studies of the warbler’s droppings and current studies being done with pieces of warbler toenails, feathers, and blood samples. Isotopes from these samples reveal what types of food the birds eat, even months earlier when they were on their wintering grounds. He outlines future threats to the bird and calls for continued vigilance to protect the bird’s population

This excellent book preserves the story of the bird’s recovery and the people that worked to make it happen.

Reviewed by Donald Drife

Copyright 2013 by Donald Drife

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