Natural enemies occurring in the garden, primarily parasitic
wasps in the Diglyphus genus, often control
leafminers. Parasites are often killed by insecticides applied
to control other pests, and a secondary outbreak of leafminers
is not uncommon.
Diglyphus parasite larva feeding on leafminer
larva in leaf
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or in the U.S., contact your local Cooperative Extension office
May 31, 2013.