We are in that time of year again when Japanese beetles invade our gardens and landscapes with an appetite that would put most teenagers to shame.
Adult Japanese beetles eat almost everything in their path, leaving skeletonized leaves in their wake. Because of the numbers at which they emerge, the damage they cause is very noticeable. Typically, though, it does not cause permanent damage to the plant.
The adult stage of the Japanese beetle only lasts four to eight weeks during the summer. During that time, the insect feasts on various plants.
Next, the female beetle lays its eggs, which hatch and spend the rest of the year underground as immature larva or white grub. The grubs feed on the roots of lawns during the latter part of the summer.
In the winter, the insects burrow deep into the soil.
After the soil warms in the spring, the grubs return to the root zone and feed some more.
Finally, they pupate and emerge as the adult beetles to feed and mate, starting the cycle all over again.
Many options are available to control of the population of the Japanese beetle adults. During the early part of the season, you can pick them off with your hands. This may help to not attract other beetles to your area.
Also, keep a jar of soapy water with you while picking them off plants. Typically, you can just brush them off into the jar, because they will usually drop down before they try to fly.
Chemical control is another option. Carbaryl (Sevin) is labeled for control of adult beetles. Follow the label directions for the rate and frequency of application.
During the thick part of the emergence, repeated applications may be needed to maintain control.
Also think about treating your lawn in the late spring to kill the grub form of the beetle. Water the lawn before and after the application of the chemical to ensure a successful treatment.
Trapping is not recommended as a control method. Typically traps only attract the beetles to your yard. You may capture a half-gallon of beetles from the traps, but you may bring another gallon or two of beetles to your garden.
Good luck in treating for these hungry beetles, and hopefully they will not make a buffet out of your gardens.
Michael Wheeler is county extension coordinator for the UGA Cooperative Extension office in Hall County. You can contact him at 770-535-8293, www.hallcounty.org/extension. His column appears weekly and on gainesvilletimes.com/life.