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[Alan Haigh <alandhaigh@gmail.com>]

Eddy, how much you need to spray for PC has a lot to do with where you're located.  In the northeast only 2 Imidan sprays are generally needed- 1 at petal fall, the 2nd 10 to 14 days later.  Sevin is easier for the homeorchardist to find and should be used on a tighter schedule and sprayed 3 times for adequate control.  I have heard of others using Malathion affectively.  Still others get adequate control organically with Surround.