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.
Don't forget to spray the underside of the foliage too.
A lot of time the bugs will 'hide out' underneath, and lay egg masses there, too.
The milky spore probably helped a lot. We have an old, very large, ‘country’ sort of yard & all we do is mow. We have moles, too - if you get rid of beetle grubs with milky spore, the moles supposedly move on to ground with a better food supply.