Bacillus thuringiensis is a naturally occurring bacterium widely used in biological insect management. Certain strains produce insecticidal proteins that become active when susceptible insect larvae consume them. This mode of action makes Bt particularly relevant to larval pest management in agricultural and horticultural crops. Biological products containing Bacillus thuringiensis can be incorporated into integrated pest management programs alongside crop monitoring, sanitation, cultural practices, and other compatible methods. Application timing is important because the product works primarily when susceptible larvae consume the treated material. Using microbial crop protection according to label directions allows growers to incorporate a biological option into broader insect-management strategies.