Which statement correctly describes timing for white grub insecticide effectiveness?

Which statement correctly describes timing for white grub insecticide effectiveness?

• A. Three to four weeks after peak adult flight
• B. During winter
• C. Before adult flight
• D. At the first sign of grub activity

Answer: (A)

White grubs are most vulnerable when they are young and actively feeding in the turf root zone. After the adult scarab beetles peak in flight and lay eggs, the eggs hatch into grub larvae within a short window, and these young grubs begin feeding right away. Applying grub insecticides about three to four weeks after that peak flight targets the grubs during their early instars when they are small, actively feeding, and easier for soil-applied products to reach. If you wait until winter, the grubs are dormant and protected; if you spray before adult flight, there aren’t active grubs yet; and waiting for the first sign of activity means feeding damage may already have started. So this timing aligns the product with the grubs’ most susceptible stage for effective control.

White grubs are most vulnerable when they are young and actively feeding in the turf root zone. After the adult scarab beetles peak in flight and lay eggs, the eggs hatch into grub larvae within a short window, and these young grubs begin feeding right away. Applying grub insecticides about three to four weeks after that peak flight targets the grubs during their early instars when they are small, actively feeding, and easier for soil-applied products to reach. If you wait until winter, the grubs are dormant and protected; if you spray before adult flight, there aren’t active grubs yet; and waiting for the first sign of activity means feeding damage may already have started. So this timing aligns the product with the grubs’ most susceptible stage for effective control.