To control Japanese beetles, apply a teaspoon of Milky Spore powder directly on the ground every 4 feet in rows that are 4 feet apart. Once applied, treat with an even spray of water. A 10-ounce box of Milky Spore covers approximately 2,500 square feet of lawn.
Milky Spore powder must be applied directly to the lawn and not premixed with water and sprayed on. If possible, apply Milky Spore shortly before rainfall. If there is no sufficient rainfall available, water your lawn with a hose for 15 minutes or longer to allow the treatment to soak into the soil. It is best not to apply the treatment to frozen ground, but any other season is fine.
Milky Spore powder can also be applied to the ground using a dispenser. A homemade dispenser consists of a coffee can with 15 nail holes punched into the lid. Tape the can 6 inches from the bottom of a 4 foot stick, and sprinkle Milky Spore onto the ground. One application of Milky Spore lasts approximately 10 to 20 years.
Milky Spore is a non-toxic, naturally occurring bacterium called Bacillus popillae that is harmful only to Japanese beetles. The grubs of Japanese beetles become infected and die by ingesting a bacteria spore. Milky Spore is safe for both pets and children, and it is not a chemical pesticide.