Last year I used a diatomaceous earth (DE) suspension with some permethrin mixed in sprayed at the base of the squash plants and it seemed fairly effective, not 100% in ridding or at least cutting way back on squash bugs. It helped then, may not help this year, time will tell. Also, I discovered some Japanese beetles in my pear trees and sprayed them with the same treatment. The flew away like they were under machine gun attack and never returned.
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