How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Leafminers

In warm weather, leafminers may be more active. The life cycle is only 2 weeks long. Eggs are inserted into leaves and larvae feed between leaf surfaces, creating a "mine." At high population levels, entire leaves may be covered with mines. Mature larvae leave the mines, dropping to the ground to pupate. There can be five to ten generations per year. Development continues all year, the population moving from one host to another as new host plants become available each season.

A leafminer larva
A leafminer larva
A leafminer pupa
A leafminer pupa
Leafminer mines
Leafminer mines
A leafminer pupa
An adult leafminer

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