http://homeharvest.com/milkspore.html

Milky Spore - Bacillus popillae
" Two kinds of bacteria are known to cause milky disease in grubs. They attack only
members of the white grub family. Milky Spore disease affects some-- 47 different
varieties of beetle grubs in the U.S. including June Beetle or May Fly grubs, but the
Japanese beetle grub is probably the most extensively affected.---- Milky disease
bacteria do not infect nor harm other insects, earthworms, birds, warm-blooded
animals, humans, or plants."

effective 15-20 years. 10oz Covers 2,500 SF $28+
about the cost of 1 nice rose, cheap at the price.
Ingrid