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larvicide
A larvicide (alternatively larvacide) is an insecticide that is specifically targeted against the larval life stage of an insect. Their most common use is against mosquitoes. Larvacides may be contact poisons, stomach poisons, growth regulators, or (increasingly) biological control agents.
==Biological agents==
The biological control agent ''Bacillus thuringiensis'', also known as ''Bt'', is a bacterial disease specific to Lepidopteran caterpillars. ''Bacillus thuringiensis israelensis'', also known as ''Bti'', and ''Bacillus sphaericus'', which affect larval mosquitoes and some midges, have come into increasing use in recent times.
''Bti'' and ''B. sphaericus'' are both naturally occurring soil bacterium registered as larvicides under the names Aquabac, Teknar, Vectobac, LarvX, and VectoLex CG. Typically in granular form, pellets are distributed on the surface of stagnant water locations. When the mosquito larvae ingest the bacteria, crystallized toxins are produced which destroy the digestion tract, resulting in death. These larvicides will last only a few weeks in water and pose no danger to humans, non-targeted animal species, or the environment when used according to directions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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