I'm in Canada, you can get BT. Safer's BTK Insecticide, 100-mL concentrate. Bottle must say Bacillus thuringiensis, since there are two different Safer BT products.. I've had caterpillar problems all summer too, finally got this
Seeds germinated on March 23rd. Put in ground around May 20th. I used the Tom Hill soil mix, recipe from the Cannabis Encyclopedia by Jorge Cervantes. I got my seeds from Crop King Seeds. Pictures taken on July 28th, 2021. Will take another set of pics on August 28th. I live in southern Ontario...