I have a flourishing crop of raspberries (I live on Long Island, NY) but last year and now this year I am seeing tiny little worms or caterpillars inside the raspberries. The insects are white and much, much smaller than the berry. I think the berries infected by these pests become very mushy, not to mention rather gross.
I sprayed the raspberry vines with an insecticidal soap, but it had no affect. I have a more powerful insecticide, but the directions say you cannot harvest fruit for 14 days after application. If I need to go that route I will, because last year these little worms spread to the whole crop and right now they are confined to one area. But since the vines are yielding a bowl of good fruit per day, I would rather not have to waste two weeks worth of fruit.
What could these little worms be? How can I get rid of them? Would food-grade DE be a good option? Should I just use more of insecticidal soap since it is fairly safe?
Related question: I recently discovered a large number of small flying beetles around the vines and on the berries. Could this be the same species as the little white caterpillars?