Yellow pecan aphid

Monelliopsis pecanis

All forms of the yellow aphid have a yellow or pale yellow background color. Unlike the blackmargined aphid, they have no markings on the wings or head. The wings are held roof-like over the body when they are at rest.
Symptoms: The most noticeable damage caused by yellow aphids is their deposits of honeydew on the foliage. Honeydew is a sticky fluid excreted by aphids, and it supports the growth of sooty mold fungi. This fungus reduces the amount of sunlight reaching the photosynthetic cells of the leaflets. Heavy spring infestations can injure a tree's vascular system and reduce chlorophyll development and leaflet size. Some studies show aphids also impair overall tree growth. Heavy late summer infestations can defoliate trees. If defoliation occurs too early in the season, from any source, nut size and fill can be adversely affected. Inaddition, if the leaf loss occurs too early, then the nut set for the next year can also be affected and winter injury could occur.

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