Microbial insecticides are diseases (aka pathogens) that kill pests. A common example is Bacillus thuringiensis (Bt), which kills various species of caterpillars. Bt is easy to apply, harmless (unless you're a caterpillar), and very effective.
Each microbial is specific to particular pests. So, as with beneficial insects, you need to carefully match one to the other. Find out if microbial controls are effective against your particular pest by asking your local nursery what it recommends.
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