Our grapevines are attacked by grapeleaf skeletonizers every year about this time. If you don't address the problem quickly, these caterpillars can defoliate the vines overnight. We generally avoid the use of pesticides in our garden, but this is an exception....handpicking and squashing hundreds of these critters just doesn't work. It's extremely time consuming and we never get them all. As soon as they make their annual appearance, we spray the grapes with Thuricide, which is actually considered organic pest control because it's a bacteria, not a chemical.
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