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Cliff Sadof, Extension Entomologist
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|Hawthorn Leafminer & Damaged Leaves|
Adults emerge in early May. Eggs will hatch a few days after being laid within the leaves. At the end of May, larvae will leave their mines and pupate within the soil. Overwintering will also take place in the soil. Hawthorn leafminers only have one generation a year. Controls should be applied around the first of May. Again, acephate is the recommended chemical for control. Caution, acephate may burn some varieties of hawthorns. Monitor trees for adult activity as well as egg laying scars on the leaves.Imidacloprid can be applied this fall to control hawthorn leaf miner in spring.It is sold under Bayer's Advanced Garden Tree and Shrub Insect control.It contains 1.47% imidacloprid. The directions are quite explicit on the label for trees and shrubs. Please note that this product can also control lacebugs, leafhoppers and aphids.
Plant and Pest Digital Library and Digitally Assisted Diagnosis, Purdue University, West Lafayette, Indiana.