Tuesday, June 14, 2011

Cottony Scale on Silver Maples

Cottony Scale has been an issue on the Silver Maples the last few years.  It is thought that mosquito control can kill the natural enemies (small parasitic wasps). Small outbreaks will not kill the tree but do produce honey dew.  We will be monitoring the scale population and if warranted apply an insecticide however they are difficult to control.
Egg cases of the Cottony Scale on Silver Maple.  In a few weeks they will hatch and begin sucking sap from the tree (click picture to enlarge)