As of 2015, Wal-Mart, Lowe's and Home Depot sell Milky Spore in powder or granule form for Japanese beetle grub control. Based in Virginia, St. Gabriel Organics manufactures Milky Spore products.
Wal-Mart and Home Depot offer Milky Spore in a 40-ounce powder form, and Lowe's sells a 20-pound bag in granular form. Customers can purchase Milky Spore online at each retailer's website or in select stores. Home Depot also sells an applicator tube to give customers better spreading control.
According to St. Gabriel Organics, 40 ounces of Milky Spore powder treats up to 10,000 square feet, and home owners only need to apply it once every 10 to 20 years. To treat their lawns or gardens, customers should spread 1 teaspoon of the product every 4 feet, creating a checkerboard pattern on the ground. After doing so, they should water the area.
Milky Spore kills Japanese beetle grubs by infecting them when they accidentally ingest the product. Infected grubs die within seven to 21 days after ingestion and release the Milky Spore bacterium back into the soil as they decompose. The product is organic and safe to use around animals and people and does not harm the environment or crops.