Japanese beetles are indeed a pest in need of elimination. However, control can be difficult depending on the type of approach you wish to take. There are broad spectrum pesticides that work well, but will unfortunately also kill off non target insects including many beneficial insects such as bees. The following link lists several chemicals https://content.ces.ncsu.edu/japanese-beetle-in-turf . If you choose to use pesticides, use caution and be sure to follow the label closely. Be aware that Imidacloprid is especially harmful to bees.

Other less harmful options, such as Neem oil, also tend to be less effective against Japanese beetles; however, I understand that if you treat early in the season before the beetles gain a foothold that you will have better results. While neem works as a pesticide against several small soft bodied pests including Japanese beetle larvae, it does not kill the adult beetle. However it can deter feeding and acts more as an anti-feedant/repellant against the Japanese beetles. It may also affect their ability to reproduce so it may reduce the next year’s population.

Turf can be treated to eliminate grubs using a product called milky spore, a type of bacterial pathogen that specifically affects beetle grubs. However, results are best if application is done throughout your neighborhood; otherwise, beetles from neighboring yards may still find their way to your desirable plants.

Traps are much more effective in attracting Japanese beetles than in trapping them. Thus, traps should be placed as far away from susceptible plants as possible.

One of my favorite methods is to knock the beetles into a bucket of soapy water (a squirt of dish soap does the trick). They are unable to climb out and will drown. Early morning control works well as beetles tend to be sluggish and are easy to knock off. This method can be labor intensive but it is very satisfactory.

This link provides an overview for some of the options available https://content.ces.ncsu.edu/japanese-beetle-1