Which option describes a biological method of weed control?

Which option describes a biological method of weed control?

• A. Use of natural predators and pathogens
• B. An organic mulch
• C. Flaming weeds
• D. Soil solarization

Answer: (A)

Biological weed control relies on living organisms to reduce weed populations rather than using heat, chemicals, or physical barriers. Using natural predators and pathogens fits this idea because beneficial organisms—such as certain insects or diseases—attack weeds, helping to keep them in check as part of the ecosystem. This method can target specific weeds and often fits well with other sustainable practices, though it may require time for the biocontrol agents to establish and can carry considerations about non-target effects. The other methods use non-living means: an organic mulch blocks light and smothers seeds, flaming weeds applies direct heat, and soil solarization uses solar-generated heat to sterilize the soil.

Biological weed control relies on living organisms to reduce weed populations rather than using heat, chemicals, or physical barriers. Using natural predators and pathogens fits this idea because beneficial organisms—such as certain insects or diseases—attack weeds, helping to keep them in check as part of the ecosystem. This method can target specific weeds and often fits well with other sustainable practices, though it may require time for the biocontrol agents to establish and can carry considerations about non-target effects. The other methods use non-living means: an organic mulch blocks light and smothers seeds, flaming weeds applies direct heat, and soil solarization uses solar-generated heat to sterilize the soil.