St Gabriel Organics St. Gabriel Organics Milky Spore Grub Beetle Killer Powder. Pack of 8 of St Gabriel Organics 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). No. 80010-9: Container 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 (Sq. Ft.): 2500, Active Ingredient: Spores of Bacillus popilliae, Pkg Qty: 1, Package Type: Box WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. This listing is for a pack of 8. WARNING: California Prop 65 - www.P65Warnings.ca.gov.