Tuesday, September 10, 2013
Black-margined aphids coat pecan leaves with honeydew
The green lacewing lays its egg on a silken thread (photo at left). A single female produces 200 to 800 eggs and from the number of eggs I've found on our honeydew-covered trees, we've had plently of lacewing actively already. Unlike the green lacewing, brown lacewings lay eggs directly on the underside of leaves or in bark crevices. Both species are important biological controls of black-margined aphid.
At this late point in the season, I do not recommend trying to control black-margined aphid chemically. Eventually, lacewings and lady beetles will cause the aphid population to crash naturally. A good thunderstorm would also help in removing the honeydew from the foliage.