Biological Grass Grub Control

Bacterial Milky Disease

• Bacterial milky disease Bacillus popilliae Dutky is an effective biological grub control option, according to The Ohio State University Extension. The disease has been especially effective in some Eastern regions of the U.S. Allow the spore count to build up for two to three years, and avoid using insecticides against the grubs during this period.

Insect Parasitic Nematodes

• The University of Florida Extension recommends the use of insect parasitic nematodes as a biological grub control. These include commercial nematode preparations from the Steinernema and Heterorhabditis species. Keep the soil moist, as this increases nematode action. Imidacloprid-based insecticides also help to increase efficacy.

Natural Predators

• Grass grubs have a number of natural predators that help to control population. These include ants, ground beetles and parasitoids from the Tiphia species, according to the University of Florida Extension. The larvae of parasitic wasps kill and feed on the grubs and build a brown cocoon around them.