The yellow pecan aphid , Monelliopsis pecanis Bissel, has clear wings which are held roof-like over the back of the body. It is a more solitary species, and most infested leaves will have only a few aphids. Heavily injured leaves drop prematurely, which can negatively affect the current and following year s pecan production. The biology of this aphid is similar to the yellow pecan and blackmargined aphids. The life cycle of these species is similar.
Winter is spent in the egg stage in bark crevices and under loose bark.
When cooler weather arrives, eggs are produced for the winter. Adults and nymphs remove sap from the leaves. This energy-rich layer supports the development of a fungus called sooty mold. This black layer on leaves reduces the leaves ability for photosynthesis. Severely infested trees prematurely drop their leaves.