How to use Bacillus thuringiensis (Bt) to Control Insect Pests

A pump sprayer is being used in a backyard setting to apply Bacillus thuringiensis (Bt) to control insect pests.

Bacillus thuringiensis (Bt) is a microbial insecticide that is highly specific for certain kinds of insects and safe against people and non-target animals. Certain strains control caterpillars, mosquitoes, black flies, and a few kinds of beetles. Read on to learn how to use this novel but natural insecticide.