I've been doing approx weekly for cole crops this year. I use the BT at spec (1 tbsp per gal for mine) so for a 1/2 gal hf sprayer it is a big teaspoon + a drop of dish soap + dribble ~1/2 tsp of molasses. It has been working really well, no worms at all on anything as yet.
I have yet to try it on tomatoes, not too many hornworms here. I'd definitely trust it for a week on cole crops.
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