American Persimmon

If you look up while wandering in the woods in the fall, you may see bright orange ball-like fruit hanging like holiday ornaments from the bare branches of some deciduous trees. They are probably persimmons, the fruit of the American Persimmon (Diospyros virginiana) tree.

American Persimmon (Diospyros virginiana) fruit, Sourland Mountains, West Amwell, NJ

American Persimmon (Diospyros virginiana) fruit, Sourland Mountains, West Amwell, NJ

Male and female flowers are on separate trees, blooming in spring or early summer. Only the female trees bear fruit.  The eye-catching fruits are edible, very tasty and mildly sweet when they are ripe.  They can also be used for baking.

Humans are not the only ones who find these fruits desirable. Fox, raccoons, opossum, skunks and white-tailed deer are among the mammals that eat persimmons and help disperse their seeds.

Red Fox

Red Fox consume fruit, including persimmons

Birds that consume this tasty treat include Catbirds, American Robins, Cedar Waxwings, Mockingbirds,

Northern Mockingbird

Northern Mockingbird

Yellow-bellied Sapsuckers,

Yellow-bellied Sapsucker

Yellow-bellied Sapsucker

and the seasonally appropriate Wild Turkey.

Wild Turkey

Wild Turkey

The caterpillars of Luna, Regal and Hickory Horned Devil moths feed on American Persimmon leaves. The caterpillars may complete their metamorphosis to become moths, or they may become a meal for a hungry bird or other predator.

In addition to its fruit, American Persimmon can be recognized by its bark, which is deeply furrowed, forming rectangular blocks.

American Persimmon (Diospyros virginiana) bark, Sourland Mountains, West Amwell, NJ

American Persimmon (Diospyros virginiana) bark, Sourland Mountains, West Amwell, NJ

American Persimmon is a member of the ebony family, with wood that is very hard and shock resistant. It has been used to make textile shuttles, and for the heads of some golf clubs that are also called woods.

American Persimmon does well in a broad range of sites, from open fields to woodlands, in moist to dry soils, growing to a maximum height of about 50 feet (15 meters). Its native range is primarily the eastern and central United States, including parts of Massachusetts, Connecticut, and southern New York, as far west as Nebraska, and to the south from Texas to Florida.  It may also be found in parts of California and Utah.  Like Eastern Red Cedar (Juniperus virginiana), American Persimmon is considered a pioneer species, one that is an early colonizer in the transition from a field to a forest.  It may eventually be shaded out as a mature forest rises above it.

American Persimmon (Diospyros virginiana) fruit, Sourland Mountains, West Amwell, NJ

American Persimmon (Diospyros virginiana) fruit, Sourland Mountains, West Amwell, NJ

 

Resources

Martin, Alexander C.; Zim, Herbert S.; Nelson, Arnold L. American Wildlife & Plants A Guide to Wildlife Food Habits.  1951.

Wagner, David L.; Caterpillars of Eastern North America, 2005.

Illinois Wildflowers

USDA Forest Service

USDA NRCS Database

USDA NRCS Plant Guide

 

 

 

New England Asters – A Hotbed of Activity!

As the temperatures cool and the changing color of the leaves intensifies, plants in the Aster (Asteraceae) family continue to offer a bright display and food for flower visitors.

New England Asters (Symphyotrichum novae-angliae) with a flower fly (Eristalis transversa) and sweat bee (Agapostemom species)

New England Asters (Symphyotrichum novae-angliae) with a flower fly (Eristalis transversa) and sweat bee (Agapostemom species)

The Aster family is also called the composite family, because of the arrangement of their flowers. What looks to us like a single flower is actually a cluster of many flowers, often of two different types: ray flowers, which look like petals, and small tubular disk flowers in the center of the display.

Tricolored Bumble Bee (Bombus ternarius) feeding on New England Asters (Symphyotrichum novae-angliae)

Tricolored Bumble Bee (Bombus ternarius) feeding on New England Asters (Symphyotrichum novae-angliae)

Some aster family members, like dandelions (Taraxacum species), only have ray flowers.

Eastern-Tailed Blue butterfly drinking nectar from dandelion

Eastern-Tailed Blue butterfly drinking nectar from dandelion

Others have only disk flowers, like Mistflower (Conoclinium coelestinum).

Zabulon Skipper nectaring from Mistflower (Conoclinium coelestinum)

Zabulon Skipper nectaring from Mistflower (Conoclinium coelestinum)

In the case of New England Asters (Symphyotrichum novae-angliae), the ray flowers’ function is primarily to add to the attraction of the floral display to entice potential pollinators to visit the flowers.  It’s the tiny disk flowers at the center of each flower cluster that offer the reward of nectar and pollen.

Tricolored Bumble Bee (Bombus ternarius) feeding on New England Asters (Symphyotrichum novae-angliae)

Tricolored Bumble Bee (Bombus ternarius) feeding on New England Asters (Symphyotrichum novae-angliae)

Even on cool, blustery days, Bumble Bees, like the Tricolored Bumble Bee (Bombus ternarius) in the photo above, forage for food. The hair on their bodies helps to keep them warm, and is a good vehicle to pick up pollen from one flower and transfer it to another.

Sweat Bees are still active in autumn, fueled by the nectar aster family members offer.

Sweat bee (Halictid family)

Sweat bee (Halictid family)

Sweat bee (Agapostemom species) feeding from New England Aster (Symphyotrichum novae-angliae)

Sweat bee (Agapostemom species) feeding from New England Aster (Symphyotrichum novae-angliae)

Sweat bee (Agapostemom species) feeding from New England Aster (Symphyotrichum novae-angliae)

Sweat bee (Agapostemom species) feeding from New England Aster (Symphyotrichum novae-angliae)

Bees are not the only flower visitors at this time of year. Flies are second only to bees in their importance as pollinators.  Some species can be seen throughout fall.

Flower fly (Eristalis transversa) feeding from New England Aster (Symphyotrichum novae-angliae)

Flower fly (Eristalis transversa) feeding from New England Aster (Symphyotrichum novae-angliae)

Many fly species have evolved to look like bees or wasps in an effort to frighten off potential predators, but if you look carefully you can see the short antennae and very large eyes that almost meet in the center of their faces that are typical of flies.

Flower fly (Eristalis arbustorum) feeding from New England Aster (Symphyotrichum novae-angliae)

Flower fly (Eristalis arbustorum) feeding from New England Aster (Symphyotrichum novae-angliae)

The fly below is masquerading as a small wasp, hoping to elude predators.  It’s larvae consume aphids, another benefit from this diminutive creature!

Flower fly (Sphaerophoria contigua) on New England Aster (Symphyotrichum novae-angliae)

Flower fly (Sphaerophoria contigua) on New England Aster (Symphyotrichum novae-angliae)

Flower fly (Sphaerophoria contigua) on New England Aster (Symphyotrichum novae-angliae)

Flower fly (Sphaerophoria contigua) on New England Aster (Symphyotrichum novae-angliae)

Moths and butterflies also use New England Aster flowers as a convenient energy drink.

Common Looper Moth (Autographa precationis) feeding on New England Aster (Symphyotrichum novae-angliae)

Common Looper Moth (Autographa precationis) feeding on New England Aster (Symphyotrichum novae-angliae)

Despite their name, New England Asters are native throughout much of the United States and several Canadian provinces. They grow along roadsides and in meadows, and make a great addition to a sunny garden with average to moist soil, even tolerating clay soil.

Take a look at the New England Asters in the photo below. How many visitors can you find on these flowers?

New England Asters (Symphyotrichum novae-angliae) with flower visitors. How many can you find?

New England Asters (Symphyotrichum novae-angliae) with flower visitors. How many can you find?

 

Related posts

Asters Yield a Treasure Trove

Resources

Eaton, Eric R.; Kauffman, Ken. Kaufman Field Guide to Insects of North America.  2007.

USDA Plant Database

Missouri Botanical Garden

Illinois Wildflowers

 

Benefits of Pawpaws

The large, luscious fruit of Pawpaw (Asimina triloba) trees is ripening now. Its flavor is a bit reminiscent of a tropical fruit, hinting at banana or mango. In addition to people, the fruits are eaten by many other mammals, including raccoons, fox, and squirrels. These animals help to distribute Pawpaw’s seeds.

Pawpaw (Asimina triloba) fruit

Pawpaw (Asimina triloba) fruit

Pawpaws contain more nutrients than many more commonly eaten fruits, including apples, grapes and peaches. They contain annonaceous acetogenins, chemical compounds that have anticancer properties. These compounds are able to sap cancer cells of their energy, and are thought to have potential in treating cancers that are resistant to other drugs. The compounds are also effective against malaria, as well as other microbial infections.

In addition to having fruit with a tropical taste, this woodland understory tree has a tropical look, with long, broad, tapering leaves.

Pawpaw (Asimina triloba) leaves

Pawpaw (Asimina triloba) leaves

Pawpaw reproduces easily through its root system, tending to form colonies. It’s appropriate for this tree and its fruit to hint of the tropics, since it is a member of the Custard Apple (Annonaceae) plant family, the majority of whose members are native to the tropics.

Pawpaw (Asimina triloba)

Pawpaw (Asimina triloba)

The leaves contain compounds that deter herbivores, so deer browsing is not a problem, and few insects eat the leaves. There are always exceptions, though. Zebra Swallowtail butterfly and Pawpaw Sphinx moth caterpillars can tolerate consuming these chemicals. As a result, the chemicals protect the caterpillars, pupae and adults of these species, making them less palatable to predators. As the trees prepare for their winter dormancy over the next few weeks, Pawpaw leaves will turn bright yellow before finally falling from their branches.

Look for the flowers of Pawpaw as the leaves unfold in spring, usually in early May.

Pawpaw (Asimina triloba) flowers

Pawpaw (Asimina triloba) flowers

Pawpaw’s dark reddish maroon flowers attract insects as pollinators, primarily flies that lay their eggs in carrion (dead rotting flesh!), where their larvae, called maggots, develop. Some Carrion beetles may also be pollinators for this species. Pawpaw has evolved to attract these insects as pollinators through deception. The flower color mimics the carrion these insects visit to lay their eggs.  But these flower visitors will have to keep searching to find the right food for their offspring.

Pawpaw (Asimina triloba) flowers with a fly, a possible pollinator

Pawpaw (Asimina triloba) flowers with a fly, a possible pollinator

Pollination is just one service these insects perform. Their larvae decompose and recycle the flesh of dead animals, a public sanitation function they share with vultures that is very important in helping to minimize the spread of disease.

Pawpaw trees can be found in rich, moist woods in the eastern United States from New York south to northern Florida, west across southern Ontario to Michigan, Illinois, and Iowa, south to Nebraska and eastern Texas. Kentucky State University has a full time research program aimed at developing and refining methods to cultivate Pawpaw as a viable commercial crop.

Pawpaw (Asimina triloba) flower

Pawpaw (Asimina triloba) flower

Resources

Beresford-Kroeger, Diana. Arboretum America: A Philosophy of the Forest. 2003

Illinois Wildflowers

Kentucky State University Pawpaw Program

The Alternative Medicine Pawpaw and Its Acetogenin Constituents Suppress Tumor Angiogenesis via the HIF-1/VEGF Pathway

USDA NRCS Plant Database

 

 

Combating Japanese Beetles

Japanese Beetle (Popillia japonica)

Japanese Beetle (Popillia japonica)

Japanese Beetles (Popillia japonica) are especially prolific this summer, voraciously consuming the leaves, flowers and buds of herbaceous (non-woody) plants, shrubs and trees. They were first discovered at a nursery in New Jersey in 1916, probably introduced here with imported nursery stock. Now widespread east of the Mississippi River in the United States and southern Canada, these insects are destructive pests in North America because the natural predators with which they evolved are not present here to keep them in check.

Red Chokeberry (Photinia Pyrifolia) leaves skeletonized by Japanese Beetles

Red Chokeberry (Photinia Pyrifolia) leaves skeletonized by Japanese Beetles

What can you do to combat these critters? Enlist the help of some predatory insects that are native to North America.

Scolia dubia on Boneset (Eupatorium species). Scolia dubia is known to prey on the larvae of Japanese Beetles.

Scolia dubia on Boneset (Eupatorium species). Scolia dubia is known to prey on the larvae of Japanese Beetles.

Scoliid wasps prey on the larvae of scarab beetles to feed their own larvae. Japanese Beetles are a species of scarab beetle. Female Japanese Beetles burrow a few inches into the ground to lay their eggs. Their larvae, often called grubs, develop underground and feed on the roots of plants. Female scoliid wasps find and enter the underground burrows of Japanese and other scarab beetles, and lay an egg on each grub. The wasp larva hatches and consumes the grub.  Two species of scoliid wasps are shown in this post, Scolia dubia and Scolia bicincta.

Scolia dubia on Grass-leaved Goldenrod (Euthamia graminifolia)

Scolia dubia on Grass-leaved Goldenrod (Euthamia graminifolia)

How can you entice these beneficial wasps to patrol your property? They can be bought with food. The adult wasps drink nectar from flowers, usually flowers that have short tubes, arranged in dense clusters that provide a landing platform for the wasp. Mountain mints and many aster family members fit this description. They seem especially partial to goldenrods and bonesets, in addition to the mountain mints.

Scolia bicincta on Hoary Mountain Mint (Pycnanthemum incanum). Scolia bicincta may also be a Japanese Beetle predator.

Scolia bicincta on Hoary Mountain Mint (Pycnanthemum incanum). Scolia bicincta may also be a Japanese Beetle predator.

These beneficial wasps are hairy, helping to make them to be effective pollinators of the plants they visit for nectar. The pollen is likely to adhere to their hairy bodies and be carried to another plant for deposit.

Scolia bicincta on Hoary Mountain Mint (Pycnanthemum incanum).

Scolia bicincta on Hoary Mountain Mint (Pycnanthemum incanum).

You may be worried about having wasps around, because of their reputation for stinging. While that reputation may be deserved for some social wasp species, like the Yellowjackets, it’s more a case of guilt by hasty generalization for solitary wasps like the scoliids. Social wasps live in colonies, which they aggressively defend from intruders. But scoliids, like many wasp species, are solitary. So there is no colony to defend. Stingers are really ovipositors (egg laying structures) that can be used for two purposes. Females may use the ovipositor to sting and subdue their prey, and also to lay their eggs. Male wasps and bees don’t lay eggs, so the don’t have ovipositors, and can’t sting. Solitary wasps like the scoliids are quite gentle, and would generally have no reason to sting a person.

Eastern Yellowjacket (Vespula maculifrons) on Goldenrod (Solidago species)

Eastern Yellowjacket (Vespula maculifrons) on Goldenrod (Solidago species)

The Wheel Bug (Arilus cristatus) is a type of assassin bug that is happy to devour adult Japanese Beetles. Wheel Bugs hunt their prey by blending in with a plant. They wait for a hapless victim to come close enough to grab it with their somewhat hairy and sticky front legs, then stab it with their beak, injecting enzymes that paralyze and then liquefy their victim’s innards. The Wheel Bug then slurps up the resulting insect smoothie, with the victim’s exoskeleton acting as a to-go cup.

Wheel Bug (Arilus cristatus) preying on Japanese Beetle; more Japanese Beetles continue to eat in upper left.

Wheel Bug (Arilus cristatus) preying on Japanese Beetle; more Japanese Beetles continue to eat in upper left.

Japanese Beetle grubs (larvae) are especially fond of eating the roots of lawn grasses. As a result, lawns are the favored location for Japanese Beetles to excavate a burrow for their eggs. Replacing as much lawn as possible with a mix of herbaceous plants, shrubs and trees will minimize the habitat available to Japanese Beetles for reproduction. Reduced habitat means fewer Japanese Beetles.

Japanese Beetles (Popillia japonica)

Japanese Beetles (Popillia japonica)

What can you do to combat Japanese Beetles?  In order to attract beneficial insects like those shown here, be sure you have a variety of plants native to your area. Take away the Japanese Beetle’s preferred habitat by minimizing the size of your lawn. There will be a corresponding reduction in the number of Japanese Beetles you see.

Spicebush (Lindera benzoin) leaf skeletonized by Japanese Beetles

Spicebush (Lindera benzoin) leaf skeletonized by Japanese Beetles

 

Related posts

Mountain Mints are Pollinator Magnets!

Asters Yield a Treasure Trove

Fall Allergies? Don’t Blame Goldenrod!

 

Resources

Eaton, Eric R.; Kauffman, Ken. Kaufman Field Guide to Insects of North America. 2007.

USDA Japanese Beetles

Beneficial Insects in the Garden

 

 

Pearl Crescents: A Flirtation Consummated

Animal species instinctively behave in ways that help further the survival of their species. Inevitably, this means spending much of their time eating and reproducing. Recently I had the opportunity to observe such behavior in Pearl Crescent butterflies.

Pearl Crescent sipping nectar from Indian Hemp (Apocynum cannabinum)

Pearl Crescent sipping nectar from Indian Hemp (Apocynum cannabinum)

Pearl Crescents are named for the crescent shaped marking near the center of the submargin of their hind wing. They can often be seen together in groups, nectaring on a variety of flowers, feeding on minerals, and flirting.

Pearl Crescent female (top) with two males hoping to capture her interest; on Butterflyweed (Asclepias tuberosa)

Pearl Crescent female (top) with two males hoping to capture her interest; on Butterflyweed (Asclepias tuberosa).

In the photo below, a male Pearl Crescent is doing some serious courting of a female.  Ignoring him, she sips nectar from Indian Hemp (Apocynum cannabinum) flowers, a species of Dogbane, and  an important nectar source in June and early July.

Do you come here often?

Pearl Crescent male (right in photo) to female (left), “You look lovely in this light! Do you come here often?”

Still in search of food, the female Pearl Crescent flew off to find more nectar, stopping on another Indian Hemp plant.  The male followed closely behind. Still drinking, she turned to let him make his case.

Pearl Crescent male (right in photo) to female (left), "You won't find a finer specimen of Pearl Crescent manhood!" Unimpressed, she continued to drink nectar.

Pearl Crescent male (right in photo) to female (left), “You won’t find a finer specimen of Pearl Crescent manhood!” Unimpressed, she continued to drink nectar.

A few seconds later she flew off again, finally turning toward him with fluttering wings; a sign of rejection, at least for now.

Pearl Crescent female (left) to male (right), "I'm not ready to commit yet!  I'm still shopping around to see if I can do better."

Pearl Crescent female (left) to male (right), “I’m not ready to commit yet! I’m still shopping around to see if I can do better.”

Later, I spotted a female Pearl Crescent with her wings open.  She appeared to be basking. Then I noticed the two other butterflies with her.

Pearl Crescent female mating with one male while another continues to plead his case

Pearl Crescent female mating with one male while another continues to plead his case

She was mating with one male, while another, undeterred, continued to lobby for her favors. She remained steadfast.

Pearl Crescent female, above right, mating with male below her.  Male Pearl Crescent on left, "Hey baby, why don't you drop that loser and fly away with me?!"

Pearl Crescent female, above right, mating with male below her. Male Pearl Crescent on left, “Hey baby, why don’t you drop that loser and fly away with me?!”

The rejected male flew off, remaining close by in case the female changed her mind.

Rejected male to female, "I'll be waiting over here when you come to your senses."

Rejected male to female, “I’ll be waiting over here when you come to your senses.”

But she elected to stay with her original choice.

Mating Pearl Crescent butterflies

Mating Pearl Crescent butterflies

When they are finished, the female Pearl Crescent will seek out the select aster species that her offspring caterpillars will be able to digest. Among the acceptable species are Heath or Awl Aster (Symphyotrichum pilosum), Calico Aster (Symphyotrichum lateriflorum), Panicled Aster (Symphyotrichum lanceolatum), and Smooth Aster (Symphyotrichum laeve).

Pearl Crescent on aster

Pearl Crescent on aster

These bright little butterflies are active from April through November in the northern parts of their range, producing multiple broods.  In the south, they are active year-round.

Pearl Crescents can be found in most of the eastern two-thirds of the US; they are very common in the east.  Their range extends into Canada from southeastern Alberta to southern Ontario, and to the south in northeastern Mexico. Look for them in a meadow or garden near you!

Related Posts

What good is Dogbane?

Romance in the Meadow – Baltimore Checkerspots

Resources

Butterflies and Moths of North America

Cech, Rick; Tudor, Guy. Butterflies of the East Coast. 2005.