Japanese beetles have a green metallic sheen to them and black legs and grows to about a half an inch. The adult beetles are destructive to leafy plants as they eat the leaves for food before they lay eggs in the soil to produce grubs that damage the roots of plants as they eat.
Killing grubs or beetles are the best way to interrupt their life cycle so as to not get an infestation from taking over your outdoors. Some methods will temporarily kill the beetles while others disrupt the life cycle completely. Here is a guide to several methods for killing adult Japanese beetles.
There are a few methods for getting rid of Japanese beetles without using harmful pesticides. The most tedious way is to pick off each adult beetle you find and then do away with it by any which way you choose. Having a cage handy is good so you can keep going with the process. Have a bucket with soapy water is also a quick way to kill them once you have your hands on the beetles.
Making your own trap at home can be made from sugar water and adding some fruit to the mixture. The sweet smell will attract the beetles into a milk jug, with the lid off, and beetles will eventually make it into the plastic jug. The smell in the jug will overwhelm the beetles and they won’t be able to fly back out or crawl out. Eventually they will drown but you’ll have to check the beetles to make sure they die.
Traps are ways to capture beetles and kill them. You can buy a trap at the store that will attract beetles and then overwhelm them. The attractant in traps are either a sweet sugary substance or a pheromone-type smell that mimics the scent of female beetles. These commercial traps are very effective and can trap hundreds of beetles a day.
Insecticides generally provide a few weeks of coverage but won’t solve the entire problem. Many multi-bug pesticides commercially available today have been recommended by the College of Agriculture at the University of Kentucky.
Cyfluthrin, which is commercially available from Bayer Advanced, kills many insects including beetles. Neem Away products provide about three to four weeks of coverage.
Growing certain plants in your garden will help alleviate an infestation in your yard by putting plants in your yard that adult beetles don’t like to feast upon. Plants like evergreens, red maple, and many oak trees are usually safe from Japanese beetles.