Sorry, Monterey BT. Do a search for it. You spray it on the entire plant. It's not a pesticide. It's specifically for killing worms and caterpillars. When the moth eggs hatch on your plant, the tiny worm will take one small bite, the BT spores will turn them brown and fall off the plant.
In my region moths lay eggs from early July to late October. So I have to treat my plants weekly until harvest.
Caterpillar will absolutely destroy plants. Heavy eaters, they tend to shit black grit in the nodes, urinate.
The key is to pre treat the plants before the eggs are laid and throughout the season. Without BT I wouldn't even be able to grow outdoors.