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Brassicas are always a challenge, I use seven garden dust early then switch to dawn dish soap spray later. My cabbage was hardly bothered this year but I have some brussel sprouts started for fall that are getting chewed up.
For loopers on brassica crops consider using some of the synthetic pyrethroids. Chemicals that end in -rin like cypermethrin, cyfluthrin, bifenthrin, cyhalothrin, etc. They are very quick acting and effective on a broad range of pests and labeled for use on most veg crops. Safe to humans and pets and have a very short PHI (pre harvest interval) usually from 0 to 3 days. They are toxic to bees, but you aren't spraying them on anything that bees will frequent.That may have been part of my problem. When I had my bees in the backyard, could not use sevin dust. Maybe the those 12 years without much control gave me a problem I cannot control now even with sevin. Have not tried cabbage in a few years now, but last time, unless I kept them picked off and used a constant coating of sevin on top AND bottom of leaf they were toast. And everytime it rained or I watered, I'd have to do it again - which ended up being most everyday - wasn't worth the trouble. Maybe the other problem is that NO ONE anywhere close grows veggies or fruit . All these hungry pests are concentrated on my yard because I'm the only one!
Many of the chemicals that are labeled for veg crops that you find on the shelf in stores are synthetic pyrethroids.
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