Last year my late harvest raspberries had hundreds of very tiny white larvae or worms on them. Many I could see, and rinse off, but putting berries in water brought out scores more. I was reticent to eat any of the late harvest. How can I prevent this infestation? I live in lower Michigan and the berries have produced very well. I have never fertilized them. Should I? I usually prune to about 3-4 feet in late fall. I am unclear as to whether or not that is correct. My early-bearing a nd late-bearing berries have pretty much merged in their 15x6 foot plot. Thank you.
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