My zucchini and butternut squash have been having a really hard time this year. Their leaves get holes in them that enlarge and eventually nothing's left but the leaf stem and its veins. My beans seem affected as well. I've spotted these veerrrry tiny insects on the top of the leaf, but nothing on the bottom. They seem immune to neem oil. I'm in Colorado, USA. Any ideas how to stop them? BTW, I've never had insect pressure this badly before, and this is the first year I've used mulch (2 to 3 inches deep).
