Honeydew is deposited on the foliage and black sooty mold fungi develops. Damaged leaves may appear speckled or have patches that often turn brown and then die. Adult aphids are either yellow or black and have soft bodies with delicate wings and a pair of tubes projecting from their abdomen. Adults have wings and immatures are wingless and usually appear in colonies. Both species overwinter as eggs deposited in bark crevices.
Nymphs are active in the spring.
There may be 10 or more generations a year. Damaged leaves may appear speckled or have yellow patches that often turn brown and then die. Such feeding can cause leaves to drop prematurely. Insect Monitoring Monitoring in a systematic way allows one to know what pest and beneficial insect population levels exist in an orchard as well as where and when. Two monitoring techniques used in pecans are field surveys and insect trapping.