I know this is an old message but figured I'd reply. I don't use sprays of any kind. My zucchini complex was about 5 ft high and as big as two cars side by side. Just when they were starting to produce a few, I noticed eggs...and larvae...and adults. LOTS of them. I only water sporadically but when you get them wet...or their refugia, they climb. That's when I do physical removal. I have killed hundreds in the last 4 weeks...maybe close to 2000. I really stepped up my game after I'd read that squash bugs can transmit squash mosaic. Within the last 2 weeks I lost 2/3 of my plants' leaves, and several fruits, but even as horrible as they look, they are producing. I now plan squash bug killings around watering. I stay on top of it now that they have found my new cantaloupe and butternut squash! I also just made up a garlic spray that I've often used as a deterrent for slugs on hostas out at my folks' house. Basically, the really cheap powdered garlic at several dollar type stores, and water. Let steep for a few days, add a small amount of dish soap, and load into a sprayer that I only use for this stuff. I am hesitant to use on the squashes because I like my squash bees. If you do use the garlic spray for anything, know that you must spray top and bottom surfaces of leaves. If it rains well, you'll need to reapply. Works on flea beetles on greens as well!
