How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Tomato pinworm

Eggs are laid on lower surfaces of leaves. Larvae usually begin to feed in leaf mines before moving to fruit. Larvae may complete development in leaf shelters, or they may leave to enter fruit, later pupating on the ground or in soil. Adults, which emerge from pupae after a few days, are active mostly at night. Mating occurs soon after emergence and females lay most of their eggs within 2 days. There can be as many as seven or eight overlapping generations per year; the life cycle takes less than a month in summer, but may take 3 to 4 months in winter. In mild winters, development continues as long as host plants are available; there is no diapause.

Pinworm eggs
Pinworm eggs
Larva in leaf shelters
Larva in leaf shelters
Pinworm adult
Pinworm adult
Larva in fruit
Larva in fruit

 


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