How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Hornworms

Damage by hornworm larvae is usually most common in midsummer, but there may also be a small population peak of larvae in the late summer. Infestations tend to be more severe in warm inland areas. The larval form is the only stage that causes damage. Eggs are laid singly on leaves. Larvae feed, then burrow into the soil to pupate. The adult develops over the winter and emerges.

Hornworm egg
Hornworm egg
Young larva
Young larva
Mature larva
Mature larva
Pupa
Pupa

Adult
Adult


Statewide IPM Program, Agriculture and Natural Resources, University of California
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