Imidan used with a sticker and acidic water (ph 5) works when sprayed at the right time. Spray 2 or 3 times at 7 to 10 day intervals. If Imidan is not available try Triazicide with a sticker and acidic water instead and spray at 5 to 7 day intervals.
There is a very long discussion here: Plum Curculio
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