You are correct about beetles (& grubs). We are probably going to have a June bug hatch with the rain yesterday & heat. The Japanese beetles are already around & eating up stuff.
Qiviut; It does not seem as bad as previous years. 4 or 5 years ago I put down Milky Spore 2 years running. Perhaps that is having an effect?
I pick the Beetles when I see them and remove them to a soapy water bucket, but I have also sprayed the Beans with a mix of neem oil with red cedar and eucalyptus oil in water with soap (surfractant) in hopes of discouraging them. Supposedly they do not like the scent. Now that its rained I suppose I will need to spray again.