- Contains naturally occurring, beneficial microorganisms that
help control Japanese beetles - Attacks the soil-dwelling, grub
stage of the beetle - Starts working within 48 hours, keeps
working all summer long - Sprayer not included; we recommend our
Hose-End Sprayer Japanese beetles are one of the most
destructive garden pests. As adults, they ravage your flowers
and vegetables. As young grubs they devour your lawn's root
system, and they attract skunks and moles. Grub Guard beneficial
nematodes are naturally occurring microorganisms that live in
the soil, feeding on Japanese beetle grubs. Unlike chemical
controls, they won't harm earthworms or most beneficial insects,
and they are safe around pets.