Easy-to-use granules stop grubs and other listed pests from further damaging your lawn. After granules are watered in, grubs and other listed insects are killed when they come in contact, delivering overnight results. Stops grubs from further damaging your lawn. Apply this product at the first sign of an infestation, when grubs are young and actively feeding near the soil surface. One application kills European crane flies in 24 hours. Larvae feed in grass roots in Spring and Summer, creating brown patches. Heaviest feeding occurs as larvae matures in the summer.