Natural bacteria controls Japanese beetles permanently. 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 and after killing the initial grubs the spores actually multiply in the soil, becoming even more effective over time and remaining viable for many years. Compatible with lawn chemicals and harmless to people, pets, earthworms and insects other than white grubs. Apply any time soil is warm.