Residual pesticides are beneficial because they reduce the number of applications required to control persistent pests.

• A. True
• B. False
• C. Not sure
• D. They increase the number of applications needed

Answer: (A)

Residual pesticides stay active after application, providing ongoing pest suppression for a period of time. That lingering activity means a persistent pest problem can be controlled with fewer spray events because the product continues to work between applications. In turfgrass management, this can translate to reduced application frequency once a product’s residual period aligns with the pest’s life cycle and pressure.

Keep in mind the benefit depends on factors like how long the residue lasts, rainfall or irrigation that can wash it off, the pest’s biology and emergence pattern, and the potential for resistance or non-target effects. If those conditions line up, fewer treatments are needed, making the statement true.