St Gabriel Organics Milky Spore Grub Beetle Killer Powder Milky Spore Powder is a 1-time application using 1 teaspoonful every 4 feet in a checker board pattern on lawn. 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, beneficial insects, or the environment. Safe for use around wells, ponds, and streams. 10 year performance guarantee, can last up to 20 years. Apply any time ground is not frozen. OMRI Organic Materials Review Institute . Size 10 Oz., Concentrate or Ready To Use Ready To Use, Application Type Dispenser, Product Form Powder, Indoor/Outdoor Outdoor, Safe For Edibles Yes, Safe For Pets Yes, Coverage Area 2500 Sq. Ft., Pkg Qty 1, Package Type Box