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  • Larval Control

    Larval Control

    Larviciding is the control of mosquitoes in their juvenile or larval stage of life in aquatic habitats. Larvicides are natural agents or chemical products that are specifically designed to kill mosquito larvae.

    The Collier Mosquito Control District uses several different chemicals for larval control as part of its Integrated Mosquito Management (IMM) program including, Bacillus thuringiensis israelensis (Bti), methoprene, and spinosad. The larvicides are used in both liquid and granular form by ground and by helicopter.

    Following is a picture of the District’s Buffalo Turbine, which would primarily be used to provide larvicide treatments in case of local transmission of the Zika virus.


    Additionally, the District is equipped to distribute larvicides by air.

    Bti acts as a stomach toxin and must be ingested to be effective. However, its mode of action is highly specific, and therefore creates little negative impact on non-target species in the aquatic environment.  Larval kills can be observed within one hour of ingestion; however, higher mortality is noted within twenty-four hours of application.

    Methoprene is a growth regulator that, when ingested by mosquito larva, mimics juvenile hormone. The presence of juvenile hormone does not allow the mosquito pupa to develop into an adult, so the mosquito dies during its pupal stage.

    Spinosad is a product derived from a naturally occurring soil bacterium that when ingested by mosquito larva causes involuntary nervous impulses that lead to paralysis and death. Spinosad is registered by the EPA as a reduced risk pesticide and it is the only reduced risk larvicide available for mosquito control because of its low toxicity to non- targets and humans alike.




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