Controls Japanese Beetles permanently. Compatible with lawn chemicals, and harmless to people, pets, earthworms and insects other than white grubs. Apply this powder to your lawn where white grubs (beetle larvae) feed on grass roots. The number of beetles will drop dramatically the next season. Only one application is necessary since after killing the initial grubs, milky spores actually multiply in the soil, remaining viable for years. Apply any time the soil is warm. A 10 oz. can treats 2,500 sq. ft.