Which statement best describes the relationship between biorational methods and chemical control in the material?

Which statement best describes the relationship between biorational methods and chemical control in the material?

• A. Bti And Bs Are Bacteria But Are Included In Chemical Control.
• B. Biorational Methods Are Entirely Separate From Chemical Control.
• C. Physical Controls Are Only Used With Biological Agents.
• D. Gambusia Is A Predator Used As A Chemical Control.

Answer: (A)

Biorational methods include microbial larvicides such as Bacillus thuringiensis israelensis (Bti) and Bacillus sphaericus (Bs). These are bacteria that produce toxins when mosquito larvae ingest them, giving a targeted, environmentally friendlier way to reduce populations. They’re considered part of chemical control in many program classifications because they are applied substances used to suppress pests, even though they come from living organisms. This combination—living organisms or their toxins used as a applied control product—places Bti and Bs within chemical control, rather than as purely separate biological methods. Gambusia, a predator released to eat larvae, represents biological control, not chemical.

Biorational methods include microbial larvicides such as Bacillus thuringiensis israelensis (Bti) and Bacillus sphaericus (Bs). These are bacteria that produce toxins when mosquito larvae ingest them, giving a targeted, environmentally friendlier way to reduce populations. They’re considered part of chemical control in many program classifications because they are applied substances used to suppress pests, even though they come from living organisms. This combination—living organisms or their toxins used as a applied control product—places Bti and Bs within chemical control, rather than as purely separate biological methods. Gambusia, a predator released to eat larvae, represents biological control, not chemical.