How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—California pear sawfly

The California pear sawfly overwinters as a pupa in the soil and adult wasps emerge in early spring. After mating, females insert tiny white eggs singly into leaf tissue, commonly at leaf margins on leaves in the lower part of the tree. Most eggs hatch by petal fall, and larvae immediately begin feeding on leaf tissue. Larvae mature on leaves during April and May, drop to the ground, and pupate in the soil. There is one generation a year; this insect is present on the trees only during spring months.

Larvae mature on leaves
Larvae mature on leaves

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