Microbial insecticides such as Bti (Bacillus thuringiensis israeliensis) can be effective. Bti is toxic to mosquito larvae but is not hazardous to non-target organisms. Bti may decrease midge populations and reduce fish food supply.
Commonly abbreviated as Bt, Bacillus thuringiensis is a species of insect-specific bacteria that has been developed as a microbial insecticide. Bt is not a contact insecticide. It has to be consumed by the target pest to become effective.
Bt (Bacillus thuringiensis) is a microbial insecticide that kills only moth and butterfly larvae and is harmless to most other insects and animals. However, don't spray throughout the garden or excessively.
The naturally occurring soil bacterium Bacillus thuringiensis var. israelensis (H-14 strain) is a commonly used microbial insecticide, sold as Gnatrol and Knock-Out Gnats and used to control fungus gnat larvae.
(Bacillus thuringiensis), a microbial insecticide that is specific for caterpillars. It is sold under various trade names including Caterpillar Attack, Thuricide, Dipel, etc.
 See also: Microbial, Insect, Insecticide, Natural, Care
  
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