These worms are really bad this year, they say its because of the amount of rain we got in so-cal. Personally I think they're bad every year. I don't care where I am , if I see a moth fly anywhere in an arms reach I will swatt it to the ground and put it out like a lit cigarette, and thats no joke. I even have my dog on it, she'll knock down anything in her path to put her teeth on em.Here the link online:.
Amazon.com: Thuricide Bacillus Thuringiensis 8 fl oz: Kitchen & Dining

They are Larvae from the Gypsy Moth, and its best to spray it at night because the UV from the sun breaks it down and it only last a week or so. So you have keep on doing it up to the end. its safe to spray a few days before harvest they say, but I stop about 2 weeks just like with nutrients and just keep a close eye on em