Fall Webworm

Fall Webworm Update

This is the second posting on Fall Webworm this season. The first Alert posted on July 27 noted that fall webworm nests are late, but on the rise. However, several significant developments have occurred since that time.
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Joe Boggs
Fall Webworms Rise boggs.47@osu.edu Wed, 07/27/2022 - 15:37
Fall Webworm (Hyphantria cunea, family Erebidae) nests are becoming noticeable in southwest Ohio. Their arrival seemed to be unusually late this season until close inspections revealed the nests are housing the red-headed biotype. But more on that later.
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Joe Boggs
Extraordinary Fall Webworm Outbreak boggs.47@osu.edu Mon, 08/16/2021 - 14:46
Fall Webworm (Hyphantria cunea) has two overlapping generations per season in Ohio. The "fall" in the webworm's common name is based on the moth caterpillars becoming more apparent late in the season due to larger second-generation nests than those produced by the first generation.
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Joe Boggs
Fall Webworm Nests boggs.47@osu.edu Mon, 06/28/2021 - 19:17
Overwintered fall webworm (Hyphantria cunea) eggs have hatched in southwest Ohio and first-generation nests are becoming noticeable. Look for these hairy caterpillars inside small silk nests enveloping just a few leaves. The nests will rapidly expand over the next few weeks to include more leaves and become far more evident.
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Joe Boggs

Spectacular Fall Webworm Nests

Fall Webworm (Hyphantria cunea) has two overlapping generations per season in Ohio. The "fall" in the webworm's common name is based on large second-generation nests normally appearing late in the season. However, we are receiving reports that where localized webworm populations are high, the caterpillars are already producing some truly spectacular nests sometimes enveloping entire trees.
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Joe Boggs
Fall Webworm boggs.47@osu.edu Mon, 06/15/2020 - 10:14
Overwintered fall webworm (Hyphantria cunea) eggs are hatching and first-generation nests are appearing in southwest Ohio. Look for these hairy caterpillars inside small silk nests enveloping just a few leaves. The nests will rapidly expand over the next few weeks to include more leaves and become more evident.
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Authors
Joe Boggs
Fall Webworm: Second Generation boggs.47@osu.edu Tue, 08/06/2019 - 15:06
Participants at yesterday's Greater Cincinnati BYGLive! Diagnostic Walk-About observed second-generation Fall Webworm nests on a number of hosts including baldcypress. All of the nests were relatively small and populated with 1st or 2nd instar caterpillars.
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Joe Boggs

Rise of Fall Webworms

First-generation nests of the deceptively named fall webworm (Hyphantria cunea) are now becoming evident in Ohio. This native moth has two generations per season in Ohio with the first-generation appearing once the overwintered eggs hatch.
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Authors
Joe Boggs
Fall Webworm Update boggs.47@osu.edu Mon, 08/20/2018 - 14:56
Fall Webworm has two generations per season in Ohio. The "fall" in the webworm's common name is based on the appearance of second generation nests late in the season. The first generation began to appear in southern Ohio in late May (see, "Spring, Summer, Fall Webworms," June 13, 2018) and second generation caterpillars are now on the scene.
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Authors
Joe Boggs