Caterpillar is a generic term for the immature stage of butterflies and moths. Two that are frequently found in food gardens are the cabbage looper and imported cabbageworm. While they can be removed by hand, they can be difficult to see. Fry offers an alternative solution. “There is an organically certified product called BTK (Bacillus thuringiensis kurstak),” says Fry. “The product name is Dipel, but there’s other products that have BTK.” BTK is a particular strain of soil bacterium that creates spores in response to adverse weather conditions. These spores come with parasporal crystalline bodies, which react to being inside the caterpillars’ gut by creating a toxin that binds with other proteins, eventually punching through the host’s gut. “It’s a really elegant tool for cabbage loopers and imported current worms,” says Fry.