Natural bacteria controls grub state of Japanese beetles. Remains dormant in soil until grubs begin feeding on grass roots to ingest it. Spore begins to multiply after ingested, killing grub from within. Will not harm humans, pets, shrubs, or beneficial insects. Safe for use around wells, ponds, and streams. Once established Milky Spore kills the Japanese beetle grub for 15 to 20 years. Use Milky Spore Grub Control applicator Model No. 80001-7 (SKU 700070), any time ground is not frozen. OMRI (Organic Materials Review Institute).