For white grub control, timing is most effective after which event?

For white grub control, timing is most effective after which event?

• A. Three to four weeks after peak adult flight
• B. Before peak adult flight
• C. During peak adult flight
• D. During winter

Answer: (A)

Target the grubs when they’re small and actively feeding in the early instars. After the peak of adult beetle flight, eggs have been laid and begin to hatch, so about three to four weeks later the majority of grubs are in their early instars and still feeding on turf roots. At this stage they’re most susceptible to soil-applied insecticides or biological controls, giving the best chance of effective control with minimal damage to the lawn. If you apply too early, there aren’t many grubs yet to kill; if you wait too long, the grubs grow larger and harder to kill, and root damage can increase. Winter isn’t effective because grubs are dormant in cold soil.

Target the grubs when they’re small and actively feeding in the early instars. After the peak of adult beetle flight, eggs have been laid and begin to hatch, so about three to four weeks later the majority of grubs are in their early instars and still feeding on turf roots. At this stage they’re most susceptible to soil-applied insecticides or biological controls, giving the best chance of effective control with minimal damage to the lawn. If you apply too early, there aren’t many grubs yet to kill; if you wait too long, the grubs grow larger and harder to kill, and root damage can increase. Winter isn’t effective because grubs are dormant in cold soil.