The japanese beetles are eating down the rose bushes to just bare stems
Japanese beetles can be voracious. One of the most effective controls is to take a bucket of soapy water out to the garden early in the morning. Hold the bucket under the blooms/plants where the beetles are feeding. Gently tap the stem. The beetles react by dropping off the flower/plant, falling into the bucket of soapy water where they will die. Of course, more beetles can fly in from surrounding areas, so you have to keep at it. But the same is true if you use a chemical pesticide, so why not go with this safe product?