Which agents are used as biological control for mosquitoes?

• A. Chemical Control
• B. Mechanical Control
• C. Mosquitofish and Bacillus thuringiensis israelensis
• D. ULV fogging

Answer: (C)

Biological control uses living organisms or products made by living organisms to reduce mosquito populations. Mosquitofish eat mosquito larvae in standing water, directly reducing the number of larvae that reach adulthood. Bacillus thuringiensis israelensis (Bti) is a bacterial larvicide that produces toxins when ingested by larvae, killing them with high specificity and minimal impact on humans, pets, or most other wildlife when used as labeled. This combination represents biology-based methods rather than chemical sprays or physical habitat changes. The other options rely on chemicals (pesticides) or physical/behavioral approaches (removing standing water, ULV fogging), which are not biological control.