The Japanese beetle, or Popillia japonica newman, is a pest that originated in Japan. In its native habitat, its natural enemies keep beetle populations in check; however, after its introduction in New Jersey and spread throughout the eastern United States, the Japanese beetle poses a serious threat to agriculture and turf grasses in both its larval and adult stages. The larvae feed upon various root systems while adults consume foliage. Despite the lack of natural predators, bountiful food supply and ideal climate for the Japanese beetle within the United States, there are ways to remove this destructive pest.
Pesticides
The use of chemical pesticides is, by far, the quickest method to control Japanese beetle populations; however, there are environmental factors to consider before choosing this method. Chemicals can cause runoff into the local water table or leave harmful residues on fruits and vegetables. Before using pesticides to control these pests, you may wish to consult your local cooperative extension regarding approved pesticides for your area and potential risks. Effective pesticides for adult Japanese beetles include Acephate, Carbaryl, Malathion, Methoxychlor and Rotenone. To control the larvae, Imidacloprid, Bendiocarb, Isofenphos, Chlorpyrifos and Diazinon are effective.
Mechanical Traps
Mechanical traps containing bait attractive to Japanese beetles are available at most yard and garden stores. These traps will lure the beetles out of infected areas and can be as much as 75% effective in removing populations from your turf or garden. When using this method to repel the beetles from desired areas by luring the pests away, be sure to place the traps outside the perimeter of your garden or turf. You should also change the traps regularly to ensure that the bait within them is fresh.
Repellent Plants
Growing plants known to repel the Japanese beetle within your garden is another method for reducing beetle populations. Garlic, chives, catnip, tansy and rue are all known repellents for Japanese beetles. Interspersing these plants within a garden will dramatically reduce existing Japanese beetle populations and prevent more of these pests from moving in. This use of repellent plants also has the benefit of providing a greater diversity of useful crops within garden areas.
Resistant Plants
Although not as effective as the use of pesticides, traps or repellent plants, the use of resistant plants in your lawn or garden can make the environment less attractive to Japanese beetles, prompting populations to migrate to another area with a more bountiful food supply. Lilac, firs, holly, pines and rhododendrons are among the plants known to be less attractive to Japanese beetles.
Sources:
- GH Organics: Japanese Beetle Control
- USDA: Managing the Japanese Beetle
Elan Potter - I have been writing since 1995 on a broad range of topics, including travel, education and gardening. Aside from freelancing, I am ...
