Green beetles are no doubt pests that people hate to deal with, and the worst thing you can do is not deal with it. The reason for this is because these green beetles are most likely Japanese beetles which are highly destructive plant and turf pests.
These beetles came to America for vacation at the Jersey Shore one day and decided to stay way back in the early 1900's. They have grown ever since, being sighted in more than 22 states across the county.
These Japanese beetles are extremely destructive in both their adult and larvae form, which is why it is so important to get them and keep them under control. Easier said than done sometimes. So just how do you accomplish this?
Beetle traps are a good method of trapping the green beetles in their adult form. If you place out the trap and it is filled up in one day, you have a problem, and should search for the grub version in you lawns. If you put the beetle trap up and only a few are caught with in a week then you don't have much to work about.
So you got a full trap? Now it is time to go grub hunting. Check for dead spots in you grass. Check around the edges of the dead spots by digging into the soil. Dig out a 8 by 8 by 3 inch sample of turf and look in the roots for grubs. A pain in the butt? Yes. You can hire a specialized pest control company to do this as well. You can treat for grubs with a product like Merit.
Some other methods include using fungi or parasites to get to them. Nematodes like
Steinernema glaseri and Heterorhabditis bacteriophora work the best, now say that ten times fast.
To sum it all up, these green beetles are a pain in the butt to kill and extremely damaging to the environment. It is possible to control yourself, but you may also want to consider bring in a professional.