Which larvicide is commonly used to target black fly larvae in streams?

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Study for the Mosquito, Black Fly, and Tick Pest Control Test. Utilize flashcards and multiple choice questions with hints and explanations. Prepare thoroughly for your certification!

Multiple Choice

Which larvicide is commonly used to target black fly larvae in streams?

Explanation:
Targeting black fly larvae in streams relies on a larvicide that acts in the water and is specific to dipteran larvae. Bacillus thuringiensis israelensis is a biological larvicide that, when ingested by the larvae, releases toxins in the gut that disrupt their midgut cells and kill them. It’s applied directly to streams as granules or briquets, so it affects the larvae where they live and minimizes harm to non-targets when used correctly. Pyrethroid ULV sprays are designed for adult mosquitoes, not larvae. Organophosphate sprays are broad-spectrum and not specialized for stream larval control, and DEET is a human repellent, not an insecticide for larvae.

Targeting black fly larvae in streams relies on a larvicide that acts in the water and is specific to dipteran larvae. Bacillus thuringiensis israelensis is a biological larvicide that, when ingested by the larvae, releases toxins in the gut that disrupt their midgut cells and kill them. It’s applied directly to streams as granules or briquets, so it affects the larvae where they live and minimizes harm to non-targets when used correctly. Pyrethroid ULV sprays are designed for adult mosquitoes, not larvae. Organophosphate sprays are broad-spectrum and not specialized for stream larval control, and DEET is a human repellent, not an insecticide for larvae.

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