Bacillus thuringiensis is a microbial insecticide used for biological control of caterpillars and various borer species. It operates by introducing bacterial spores and toxins into the insect larvae as they feed on plants. These toxins quickly disrupt the larvae's digestive system, causing them to stop eating within minutes and die within 2-5 days. With a 4-hour reentry interval (REI), Thuricide is well-suited for use on edible crops and in nurseries to manage pests such as gypsy moths, armyworms, inchworms, cankerworms, tent caterpillars, cabbage loopers, and tomato hornworms.