In Central Texas, so no snow. Loopers have skeletonized my brassicas, even though I go squish them 3-4 times daily.
Aphids attacked my squash. Bottom of leaves were black with them. In desperation, I grabbed Lemon Crisp Clorox Disinfecting Wipes, and cleaned off the tops, and bottoms of the leaves, and also the stems, in case borer eggs were hiding.
In a few hours, they looked like happy plants. By the next day, they looked like healthy robust plants. I looked up the active ingredient in the wipes, and saw it listed in some plant products.
Anyone else try these for getting rid of aphids, powdery mildew? They are useless on cabbage loopers, BTW, except to wipe them off, doesn’t phase them.
Cabbage loopers are only good for one thing - fish bait !
After working in the garden, maybe you should take a lesson from nature , ..and go fishing ! LOL !
I’ve had luck covering brassicas with the thinnest remay I could find. Didn’t raise the temp but kept the little ‘tards off!