The most effective ones contain Neem oil or some type of insect killing soap. There are sprays you can use to control the beetles. This DOES work but, yes, it is time consuming. You can also vacuum them off with a hand held vacuum and dump the bag or canister into the water solution. I have done this many times and it does work. The dish soap makes it impossible for them to get out of the water and therefore they will drown in the water solution. The best and most effective way to kill Japanese beetles is to pick them off with your hands or shake the branches of your plants and put the beetles in a solution of 1 tbsp dish soap and a gallon of water. Killing Japanese beetles can be done several ways but they are a bug that you will have to watch for from June until fall when it starts to get cooler outside.Īre some tried and proven ways to kill Japanese beetles and their grubs. Their grubs feed on the roots of ornamental trees, shrubs, garden plants, and grasses and live less than a foot underground. on over 300 varieties of plants and crops.They are very transient in that they keep moving until they find food and then they stay there until the food is gone then move on to the next food source.
They aren’t very good fliers however and usually miss their target on the first try. They are coppery brown to greenish coloured bugs about half an inch long and they can fly. I have seen them on a few of my garden plants that I have around my landscape. They are common garden pests that will devour your plants within a day if they are not controlled. The next thing you know you have an infestation going on. One beetle by itself won’t do a lot of damage but once they start to feed on your plant they send out a signal to other beetles that there is food available. It’s not easy but it can be done as long as you are persistent. People ask me all the time how they can get rid of Japanese beetles (Popillia japonica Newman).
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