Which set of practices best represents the components of integrated pest management (IPM) in rangelands?

• A. Economic analysis and risk assessment
• B. Chemical and physical methods only
• C. Cultural, mechanical, biological, and chemical methods
• D. Regulatory and policy measures only

Answer: (C)

Integrated pest management in rangelands means coordinating multiple control tactics based on monitoring and action thresholds to keep pests below damaging levels while protecting the ecosystem. The best representation includes cultural, mechanical, biological, and chemical methods. Cultural practices reduce pest problems through grazing management, rotation, site preparation, and promoting competitive, healthy vegetation that resists pest establishment. Mechanical methods physically remove or disrupt pests, such as mowing, tillage, or barriers. Biological methods rely on natural enemies—predators, parasitoids, pathogens—and habitat management or augmentation to enhance their effectiveness. Chemical methods are used selectively and strategically when thresholds are exceeded, choosing targeted, environmentally mindful products and applying them in a way that minimizes non-target effects and resistance. Together these components form an IPM approach rather than relying solely on chemicals or on policy and economics alone.