I take it these are summer fruiting rasps? if so, they should have droppedtheir leaves by now! I'd strip off the leaves by hand. The fruit in the summer will be carried on new growth, and the plant doesn't normally take in chemicals through the bark.
If you don't want to risk eating them, pop 'em in the freezer, I'll drive over to pick 'em up at the end of the picking! ;) ;D ;D ;D