The active ingredient in Monterey Garden Insect Spray is an organic compound called spinosad, which was found in soil at an abandoned rum distillery in 1982. Produced during fermentation, spinosad is fast acting and effective against the larvae of lily leaf beetles, caterpillars, thrips, leafminers, and other chewing insects on outdoor ornamentals, lawns, vegetables, and fruit trees. Because spinosad must be ingested to work, it doesn't affect sucking insects or predatory beneficial insects. This new chemical offers more effective pest control than Bt (the bacteria, Bacillus thuringiensis) and it does not persist in the environment. Listed by the Organic Materials Review Institute (OMRI).
Mix 4 tablespoons of Monterey Garden Insect Spray liquid concentrate per one gallon of water and apply with a hand-held sprayer to both upper and lower leaf surfaces. Prepare only as much as is needed for a single treatment. One pint (16 oz) of Monterey Garden Insect Spray concentrate makes 8 gallons of spray.