Michigan,
United States 
what is a good spray for apple trees? to keep the bugs off apples?
27 Apr, 2010
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Probably best to check with your local cooperative extension, since they are most familiar with the local pests and their life cycles. Because of past environmental damage, smart gardeners (and farmers) spray only what they need to spray for, when it is needed. The days of hosing everything down with DDT three times a year are over.
28 Apr, 2010