- 1). Apply nematodes to the ground. Nematodes can be ordered through organic gardening websites. Pour the nematodes over the grass and water well so that the nematodes can make their way down into the soil. The nematodes will infect the grubs with diseases and kill them.
- 2). Stop watering the grass. Though this will kill some grass, it will also deny the grubs water and nutrients, which will kill the grubs over time.
- 3). Bring birds to the area. Birds eat grubs and often will control the grubs by eating them. The more birds that are available in the area, the better grub control there will be. It is best to use wild birds if possible, although birds like chickens can be used in some areas.
- 4). Apply milky spore to the grass. Milky spore is effective only against Japanese beetle grubs, not other types. It will cause the grubs to vomit everything eaten and will kill grubs without killing the natural predators, such as birds, that eat them.
- 5). Kill the adult beetles. Fewer adult beetles mean fewer offspring. The next year there will be fewer grubs until they are completely gone. This is a slower method, but it can be useful when combined with other methods.
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