Apple leaf (curling) midge
Dasineura mali (Kieffer)
The adult is a tiny dark brown fly (A), and the larva is a yellow-white maggot with a reddish tinge (B).
NB, QC, ON, NY, New England states.
Larvae attack leaves and flowers of apple trees, which can particularly impair the growth of young or grafted trees. Larvae spend most of their life within a rolled leaf (C), and then usually drop to the ground to pupate. Major symptoms of infestation are tightly rolled leaves, caused by early instar larval feeding. Leaves subsequently become brown and brittle (D) and drop from the tree.
Sprays are seldom required; generally not a problem in orchards receiving seasonal insecticide sprays for other pests, particularly in late spring, just as leaf symptoms would start to appear.
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the AgBioResearch, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.