The bacterium Bacillus popillae produces milky spores, which are used to control the population of Japanese beetle grubs in the soil. Milky spores do not affect other grubs, nematodes or other organisms.
About this Author
Melody Lee worked as a newspaper reporter, copywriter and editor for 5 years. In addition, she has edited magazine articles and books. Lee holds a degree in landscape design and is a Florida master gardener. She has more than 25 years of gardening experience, which includes working at nurseries and greenhouses.