Serpentine Webworm Moth

Herpetogramma aeglealis · Order: Lepidoptera · Family: Crambidae

Also called: Serpentine Webworm

Damages trees, gardens or crops. The larvae feed on a variety of herbaceous plants, including cultivated raspberry, so they can damage garden and crop plants.

Source: Wikipedia

Serpentine Webworm Moth
Photo: Christine Young, CC BY

Adults have a wingspan of about 27 to 34 mm, with males slightly larger than females. Males show dirty-white hindwings with dark grey markings, while females have a golden hue.

Source: Wikipedia

Size

Male wingspan ranges from 29 to 34 mm; female wingspan ranges from 27 to 31 mm.

Source: Wikipedia

Where it is found in the US

Recorded in 34 of 51 states and DC. Most records: Virginia, Pennsylvania, Vermont, New York, Connecticut, Massachusetts, Maryland, Michigan.

Darker = more records. Counts are museum and citizen-science records, not population size.

Source: GBIF

Status: native in North America; native in United States; native in Canada. Source: iNaturalist

Months it is reported in the US

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Source: GBIF

More photos

Serpentine Webworm Moth photo 2
Photo: Nick Block, CC BY
Serpentine Webworm Moth photo 3
Photo: Christine Young, CC BY
Serpentine Webworm Moth photo 4
Photo: pachips, CC BY
Serpentine Webworm Moth photo 5
Photo: Shirley Zundell, CC BY

Questions people ask

How large are adult Serpentine Webworm Moths?

Males have a wingspan of 29 to 34 mm and females 27 to 31 mm.

Source: Wikipedia

How can I tell male and female moths apart?

Males have dirty-white hindwings with dark grey markings; females show a golden hue.

Source: Wikipedia

Same family (Crambidae)

Box Tree MothBox Tree MothCydalima perspectalisDamages trees, gardens or cropsCelery Leaftier MothCelery Leaftier MothUdea rubigalisDamages trees, gardens or cropsElegant Grass-veneerElegant Grass-veneerMicrocrambus elegansHawaiian Beet Webworm MothHawaiian Beet Webworm MothSpoladea recurvalisDamages trees, gardens or cropsGarden Grass-veneerGarden Grass-veneerChrysoteuchia culmellaDamages trees, gardens or cropsBluegrass Webworm MothBluegrass Webworm MothParapediasia teterrellusDamages trees, gardens or crops

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Herpetogramma_aeglealis

Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia

Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.