Monterey B.t. Bacillus Biological Insecticide 1 pint.. The Monterey B.T. Bacillus is a powerful insecticide designed to target and eliminate pests such as the Cabbage Looper, Bagworm, Gypsy Moth, Fall Cankerworm, and Elm Spanworm. With its active ingredient, Bacillus Thuringiensis, this product ensures effective pest control. The 1 pt. jug container makes it convenient to use and store. Monterey, a trusted brand in the industry, guarantees the quality and reliability of this B.T. Bacillus insecticide. Say goodbye to unwanted pests and protect your plants and trees with the Monterey B.T. Bacillus, the ultimate solution for pest control in your landscape.