hi gerry, our street has about 6 silver birch trees, all around 20-25 yrs old . no troubles until now, but this year they are infested with white and green flies, we park under these trees and there is a sticky coating and flies all over the cars every day. the trees are as high as the houses--2 stories--so no chance of spraying!!. can you advise --or will a severe frost in the winter take care of the problem if we wait it out? thanks grerry.
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