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Larvicides are a type of insecticide specifically designed to destroy larvae (insects in the larval stage). They are most commonly used against mosquitoes and flies. Larvicides have several methods of action: through contact, ingestion, or biological control agents. By using larvicides, the growth and development of the insects is impeded and infestations can be easily avoided.

Biological control agent Bacillus thuringiensis, also known as BT, is a bacterial disease of caterpillars specifically. Bacillus Thuringiensis Israeleniss is known as BTI and it affects the larvae of mosquitoes and flies. It has begun to be used more increasingly lately. BTI are naturally occurring soil bacteria, but there are products which are usually in the form of granules and pellets, which are spread on the surface of stagnant water. When mosquito larvae ingest the bacteria, toxins destroy their digestive tract.