According to Malcolm Beck (co-author of The Texas Bug Book),an effective way to control moths and adult June beetles is with a 60-watt lightbulb.Hang the light over a bucket a little below the rim,and fill the bucket one-third full of soapy water. Put it out about the end of March and keep it on each night. Place it high enough so a child or pet can't get to it. You will catch hundreds of moths and June bugs each night. Empty at least every other day or the insects will begin to decay and stink.When it starts attracting and trapping beneficials such as green lacewings and praying mantids, discontinue use of the light trap until next March.Incidentally, adult June bugs are known to do some minor leaf chewing.There are other methods to stop June bugs at the larval stage, while they're still in the soil. Some of these are beneficial nematodes,compost, and sugar or molasses added to the soil.