From the ArcaMax Publishing, Gardening Newsletter:
http://www.arcamax.com/news/gardening/s-11597-959790
If you observe an accumulation of white, fuzzy deposits on branches and pruning wounds of crab apple, hawthorn, cherry, and pear trees, you have an invasion of woolly aphids. These fascinating insects will produce a protective, white covering that renders insecticides ineffective. One of the most effective ways to control the lint-like accumulations is to wash them off with a forceful spray of water.
This news arrived on: 08/19/2004