- Provides long term control of Japanese beetles - Safe for
people, pets and beneficial soil organisms Milky Spore is a
naturally occurring microscopic bacteria (Bacillus popilliae)
that kills Japanese beetle grubs before they can grow into
ravenous adults. It's a long-term solution because it survives
winter temperatures. The Milky Spore population increases each
year, reaching peak effectiveness about three years after
application, and lasts ten years or more.