They’re a scourge ‘over East!’  They completely defoliated my 3 year-in Himrod grape vine this season, obviously preferring vitis vinifera to vitis labrusca (I have both).  I find their white grubs writhing in the soil, where they feed on grass roots until emerging the following summer.

Other than pheromone traps, you can control what you can reach with a small container of soapy water.  They’ll instantly dive or drop to the ground when sensing danger, so catching them in the soapy water placed under the leaf ends their damage fairly quick.  

The article speaks of Box Elder bugs ..I’d trade for them in a second, and almost miss them   Do encourage whatever it takes to stop the spread of Japanese Beetles, they’d tear into those vineyards 

I’d occasionally find those big white maggots while digging out west ..my dogs loved them, but I never knew what they were.  I’m told the moles over-east here do feed on the Jap. beetle grubs. While doing some extensive planting prep this year I was finding them about to emerge as not quite fully ‘colored up’ adults.  That confirmed to me who & what the grubs were..

The adult beetles also tore into my Asian plum leaves, often mating as they appeared to feed, so extremely prolific.

The organic farm I work for has a nifty method of thinning them out, beside traps.  They allow small patches of asparagus to fully grow, while harvesting the rest of the field.  As the Jap. Beetles love asparagus … the crew will eliminate thousands of them using a torch to burn both the mature asp. plants and beetles..  Not a battle you want to fight, though