A long-lasting, grub control spreader that will solve all of your problems. 20 lb. Milky Spore, Grub Control Spreader Mix. This is a organic compound that attacks larvae of Japanese beetles. Apply with spreader anytime from spring through fall. Kills grubs for 15 to 20 years, providing you with the ultimate coverage. Harmless to all other living things and will not effect birds, bees, beneficial insects, fish, animals, plants, or humans. Provides up to 7,000 square feet of coverage.