Wooly Bullies: Avoiding and combating woolly apple aphids

A nicely written article giving suggestions for combating woolly apple aphids -- from how to prune trees to minimize the impact of the aphids to better types of fertilizers to use -- this article gives some good tips for the backyard orchardist.

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Additional information from All About Apples
From the New York Integreated Pest Management Program, here is some detailed information on the Wooly Apple Aphid, with an excellent table summary of the types of rootstocks more susceptible to these pests.