Fall-webworm

Guides

• Therion morio

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  Therion morio is a parasitic ichneumon wasp in the family Ichneumonidae. Females possess a short, spine-like ovipositor used exclusively for laying eggs inside caterpillar hosts, not for defense. The species is widespread across North America, ranging from Nova Scotia to Florida and west to Washington, Nevada, Kansas, and Mexico. It is considered a beneficial biological control agent of pest caterpillars, particularly the Fall Webworm (Hyphantria cunea).

  parasitoidbiological-controlichneumon-waspcaterpillar-parasiteforest-understoryNorth-AmericaFall-Webwormmimicry