Insects Active at night

Fall Webworm Moth

Hyphantria cunea

iNaturalist Wikipedia

Famous for the massive silk 'tents' their caterpillars build in late summer, the adult Fall Webworm Moth is a stunning, snowy-white visitor to the night garden.

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Quick Identification

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Size

Wingspan of 30–42 mm (1.2–1.7 in); body length roughly 15–20 mm (0.6–0.8 in)

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Colors

Brilliant snowy white wings, occasionally marked with small black spots; legs often show orange or yellow at the base

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Key Features

Solid white or black-spotted white wings
Densely 'furry' white thorax
Orange or yellow markings on the femur of the front legs
Comb-like feathery antennae in males

When You’ll See Them

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Activity pattern Active at night

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Peak hours 10 PM - 3 AM

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Season May-August (Adults); August-October (Larvae/Nests)

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Diet Larvae are generalists eating leaves of over 600 hardwood species including mulberry, walnut, and hickory; adults typically do not feed.

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Habitat Deciduous forests, suburban backyards, orchards, and city parks with hardwood trees.

Behavior

The Fall Webworm Moth is best known for its gregarious larval stage. The caterpillars are famous for spinning expansive, silken tents over the tips of tree branches during the late summer months. These nests serve as both a communal dining hall and a fortress against predators. Unlike tent caterpillars, which build nests in the crotches of tree trunks, webworms start at the ends of branches and expand the silk as they consume more foliage.

As adults, these moths are strictly nocturnal and remarkably short-lived. Once they emerge from their cocoons, they typically do not eat, focusing their limited energy entirely on finding a mate and laying eggs on the undersides of leaves. While they are often viewed as pests due to the unsightly appearance of their larval nests, they rarely cause permanent damage to healthy, established trees, making them a fascinating, low-impact resident of the backyard ecosystem.

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Camera Tips

To capture high-quality images of the adult Fall Webworm Moth, your best strategy is to utilize their strong attraction to light. Set up a white sheet in your backyard and illuminate it with a UV 'black light' or a mercury vapor lamp. Mount your camera on a tripod approximately 2-3 feet from the sheet, using a macro lens or a camera with a short minimum focus distance. Because these moths are white, they can easily 'wash out' in photos; try reducing your exposure compensation or lowering the intensity of your flash to preserve the detail in their wings.

If you prefer a more natural setting, position your camera near known host trees like Mulberry, Black Walnut, or Pecan. Look for the distinctive silk nests during the day and set up your camera nearby for the evening. Adult moths often rest on the foliage surrounding these sites. Since they are most active in the middle of the night, ensure your camera's night vision or external flash is ready to trigger on small subjects.

For those using AI-powered backyard cameras, place the device near a porch light or an automated garden light. Because the moths are relatively small, you may need to adjust your camera's sensitivity settings to 'High' to ensure the motion sensor triggers. Early summer and late summer are the best times to catch the two main 'broods' of adults in most temperate regions.

Similar Species

Species that look similar or are commonly confused with Fall Webworm Moth.

Virginian Tiger Moth

Larger and has more distinct black spots on the wings and yellow-orange bands on the abdomen.

Eastern Tent Caterpillar Moth

The adult is reddish-brown with two pale diagonal stripes, unlike the snowy white Fall Webworm.

White Ermine

Has many more numerous and prominent black spots across the entire wing surface.

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Frequently Asked Questions

Adult Fall Webworm Moths are strictly nocturnal. They are most active during the darkest hours of the night, typically between 10 PM and 2 AM, when they fly in search of mates and host trees for egg-laying.

The most effective way to attract adults is using a light trap or a bright UV light against a white sheet. To encourage them to stay and breed, planting host trees like Mulberry, Walnut, Hickory, or Cherry will provide the necessary food for their larvae.

As caterpillars, they are generalist herbivores that eat the leaves of hundreds of hardwood tree species. As adults, however, they have vestigial mouthparts and generally do not eat at all, living only a few days to reproduce.

Yes, they are extremely common in suburbs. Their silk nests are a frequent sight in backyard fruit trees and ornamental hardwoods across North America every August and September.

Check the nest location! Fall Webworm nests are found at the tips of branches and enclose the leaves they are eating. Eastern Tent Caterpillar nests are found in the 'crotches' or forks of the tree trunk and the larvae leave the nest to feed.

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