Name a common aquatic pest target for algaecides.

• A. Mosquito larvae.
• B. Algae (e.g., pond scums, filamentous algae).
• C. Crayfish.
• D. Zooplankton.

Answer: (B)

Algae are the typical target of algaecides. These products are designed to control or reduce algae growth in water bodies, which helps prevent unsightly pond scums, filamentous mats, and the resulting problems like reduced light penetration and oxygen depletion. Algaecides work by inhibiting algae growth or killing the algae themselves, making them the go-to treatment for algae-related issues.

Mosquito larvae, crayfish, and zooplankton are not the usual focus of algaecides—they’re targeted by other pesticide types or management methods. So the best answer is algae, the common aquatic pest addressed by algaecides.