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Yup this is the stuff you want to take care of any caterpillars... I spray at least once weekly, more if it rains after sometimes. Bottle will cost about 20 bucks for the season for me, I stop spraying so much once the buds are fat, at spray at night or am before direct light.
Make sure if/when you buy it you read the ingredients, there is a specific subspecies the B.t. is derived from, and "Kurstaki" is the one you want for caterpillars..
Also, it works wonders for tons of stuff so worth the money for sure.
I've seen 3 tiny caterpillars/inch worms all year on all my plants, They've been tiny too, like .25 inch to half inch at most.
As for latitude Im technically 41 basically 42 though... and all mine have been in flower for about 2 weeks or so, some are a little behind others but theyre all throwing a bunch of pistils, I'd call it week 1 or 2 if I were counting weeks which I dont. Dont worry NFG you'll get there.
If they arent going by the end of august Id start to worry a bit maybe, just because Im always flowering by now no matter what strain I grow usually.(prefer indicas and kush/diesel hybrids though, that could be why?) You're plants are mature yeah? They at least have a few pistils growing? What strain you running again I know ive seen your posts I just forget, and any excess on nitrogen by any chance?
Wish I had some barn swallows around!... One thing I do got is about 100 bats 20 ft away in a tree, they come out as the suns setting every night and just totally fuck the skies up. Im sure their guano has been having benefits near their tree as well, wish there was a way to harvest it. (Reminds me of a sweet documentary I saw the other night about a bat cave and like 1000 ft tall hill of pure bat guano from 1000s of years of billions of bats chillen in this cave... It was massive, like a literal mountain of just pure bat guano and then covered in cockroaches, but still.... crazy stuff.)
I dont think this was it, but looks similar just to give you a sense of scale.