Everything about Larvicide totally explained
A
larvicide (alternatively
larvacide) is an
insecticide that's 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.
Methoprene is another biological agent that interrupts the growth cycle of insect larvae, preventing them from development beyond the
pupa stage. Altosid is the trade name for methoprene, which is usually applied to larger bodies of water in the form of time-release briquets which can last from one to five months. Use of this larvicide doesn't pose an unreasonable health risks to humans or other wildlife and it won't leach into the ground water supply. There is a small acute and chronic risk to some fish and freshwater invertebrate species.
Temephos, marketed as Abate and ProVect, is an
organophosphate which prevents mosquito larvae from developing resistance to bacterial larvicides. Due to the small amount needed and the fast rate that temephos breaks down in water, this type of larvicide doesn't pose an unreasonable health risk to humans, but at large doses it can cause nausea or dizziness. Similarly, there isn't a large risk to terrestrial species, but there's a toxic concern for non-targeted aquatic species. Therefore, temephos should be limited only to sites where less hazardous larvicides are ineffective and with intervals between applications.
Other techniques
Larviciding techniques can also include the addition of surface films to standing water to suffocate mosquito larvae, or the
genetic modification of plants so that they naturally produce a larvicide in plant tissues.
Further Information
Get more info on 'Larvicide'.
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