how about horticultural fleece around the plant or around the whole bed to stop the little blighters getting in?
horticultural fleece? never heard of it. anything that would surround the base of the plants might have some chance of working...
obapinia - the only thing i've found concerning natural predators is trichogramma wasps. those might be something to keep in mind for next season, but i think it's too late for them to do much good now.
anyway, i have a little update- i was previously under the impression that these wicked moths oviposit below the surface of the stem, but yesterday found out that they lay small, brown eggs on the surface. immediately i went outside and started checking, and sure enough, every single one of my 50+ squash and pumpkin plants were just peppered with the things around the crown, especially around the very lowest part right at the soil line. so i spent the next two hours cussing and scraping them off with my pocketknife
i took a picture but will have to post it later. no doubt when i go out and look after work today, there will be more to be scraped off. maybe there's some sort of horticultural oil spray i could dowse with that would keep the eggs from adhering and/or keep the moths away in the first place?
(picture from u. of kentucky website) [img]https://www.uky.edu/Ag/Entomology/entfacts/images/svbadult.jpg[/img]
it's strange that these borers are so bad in my immediate area; they grow great gobs of pumpkins not far from here, and when i asked them last fall how they dealt with squash borers, they claimed to never have had a problem with them.
<edit - here's a picture of a pumpkin plant with borer eggs at the base; tiny brown things a little smaller than squash bug eggs >