Bti and Bs are described as what?

• A. Bacteria but Included in Chemical Control.
• B. Predators Used For Bio-Control.
• C. Mosquito Pathogens.
• D. Algae.

Answer: (A)

Bti and Bs are Bacillus bacteria used specifically to kill mosquito larvae. They act as microbial larvicides: when mosquito larvae ingest the spores and toxins produced by these bacteria in water, the toxins disrupt the larval gut and cause death. This makes them a biological control agent, distinct from predators or algae, and, in many control programs, they’re classified alongside chemical insecticides because the products are formulated and applied as microbial insecticides. So the correct description highlights that they are bacteria and are used within chemical control options to reduce mosquito populations.