Answer: There are a few garden pests that like to feed on raspberry leaves; sawfly larvae and Japanese beetles are the most common. Neither do a great deal of harm to the plants so, especially since you've got a 2 year old gardener in tow, I'd suggest you just leave the plants to fend for themselves. You'll eventually be cutting down the bearing canes. As long as you remove all the debris from the garden, and if you cultivate the soil (shallowly) around the canes to expose any pupating insects to weather and birds, your plants should be just fine.
Hope you have a bountiful harvest!
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