Small, yellow, green or black soft-bodied insects feed on the foliage. Rectangular yellow areas about 1/4 inch long may appear on the leaves. These yellow areas turn brown, and the affected leaves drop. In some cases, the youngest leaves are curled, twisted, and dying. A shiny or sticky substance, sometimes overgrown with black sooty mold, may coat the leaves. The pecan yield is often reduced. Severely infested trees may lose their leaves prematurely.
Spray infested trees with an insecticide labeled for these pests, following label directions.