The chemical must get into the soil below the thatch, where the young grubs are feeding. If the lawn was not aerated in the spring and there is more than one-half inch of thatch, aeration may be needed before the insecticide is applied. Do this only when weather conditions are cool and moist. Granular formulation of insecticides are best, but solubles and emulsions may be used. Calibrate and apply as stated on the label.
Irrigation following application of the pesticide is essential.
Apply an inch of water immediately, then repeat watering every four to five days. This will move the insecticide into the grub feeding zone. A second application is not usually necessary.