Healthy earthworm populations assist in reducing overwintering populations of tentiform leafminers by dragging leaves underground, from where adults the next year cannot successfully emerge. When needed, acephate can be applied in early May and again in early June to control young leaf miner larvae. Imidacloprid, also registered in Connecticut for control of this pest, will provide season-long systemic control if applied in early spring as a soil drench. Consult the labels for dosage rates and safety precautions. Thorn limb borer, Saperda fayi .
Infested twigs break off in the wind.
The thorax has a white stripe on each side extending on the base of the wing covers. There is one annual generation and the beetles appear in June. Removing and destroying the infested twigs will provide some control. Twospotted spider mite, Tetranychus urticae. This pest infests the undersides of the leaves, which become light yellow in color, and the plants have a generally unhealthy appearance.