The timing of application for granular insecticides targeting soil-dwelling larvae of beetles is crucial for effective control. These products work best when the larvae are small and actively feeding near the soil surface. Applying the treatment outside of this active feeding window, such as when the larvae are large or have already pupated, will significantly reduce its effectiveness. An example includes applications made in the late fall or winter when the larvae are dormant at lower soil depths.
Correct timing maximizes the insecticide’s impact, minimizing damage to turf and other susceptible plants. Historically, preventative treatments were common, but current best practices emphasize applications based on monitoring and predicted life cycles. Accurate application timing can reduce the overall amount of pesticide needed, decreasing environmental impact and cost.