Name two non-chemical rangeland pest control options.

• A. Prescribed burning and grazing management (or mowing).
• B. Residual herbicides and insecticides.
• C. Chemical fertilizer applications.
• D. Irrigation scheduling and tillage.

Answer: (A)

Focusing on methods that reduce pests without using chemicals is about shaping the plants and environment to suppress pest problems. Prescribed burning and grazing management (or mowing) do exactly that by altering habitat, seed banks, and competitive dynamics to favor desirable forage and limit pest species.

Prescribed burning helps manage pests by reducing weed seeds and disrupting the life cycles of many forage pests and pathogens that depend on surface litter or dense cover. It also helps control woody encroachment and opens space for native grasses to reestablish, improving overall range health without applying pesticides.

Grazing management, including strategic stocking and rest-rotation, suppresses certain weeds through selective grazing, trampling, and reduced seed production. By keeping competitive native forages stronger and reducing opportunities for pest species to flourish, this approach lowers pest pressure without chemicals. Mowing can achieve similar effects by preventing seed set and weakening aggressive weeds, again relying on cultural timing and plant responses instead of pesticides.

The other options rely on chemicals or belong to practices that aren’t primarily pest-control tools in rangeland settings. Residual herbicides and insecticides are chemical controls. Chemical fertilizer doesn’t directly control pests and can even affect plant–pest dynamics in unintended ways. Irrigation scheduling and tillage influence water availability and soil disturbance, respectively, and aren’t standard pest-control tools in rangeland management.