Try sevin dust or a pump sprayer with liquid sevin diluted and Japanese beetles drop like crazy. As far as the larvae, spray your yard in August and September to start killing the hatch. I also have heard the arguments about hanging traps in my yard and I will take my chances by tying off a bag every few weeks and killing 3-4 thousand beetles, what a joy. That is a lot males not fertilizing eggs. There are a few websites that have scheduled spray times and what to use at the right time for your area.
Try sevin dust or a pump sprayer with liquid sevin diluted and Japanese beetles drop like crazy. As far as the larvae, spray your yard in August and September to start killing the hatch. I also have heard the arguments about hanging traps in my yard and I will take my chances by tying off a bag every few weeks and killing 3-4 thousand beetles, what a joy. That is a lot males not fertilizing eggs. There are a few websites that have scheduled spray times and what to use at the right time for your area.