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It's most likely Japanese Beetles. The best way to deal with them is to catch them in the act & hand pick them off. Or use milky spore on your lawn to kill the grubs (baby japanese beetles) over time.
Usually, I just tolerate the damage until they go away. They never decimate my or my neighbor's knockout roses to cause actual damage to the health of the plant.
I had Aphids eat through almost ALL the leaves of my rose last year. In almost two weeks it went from a few brownish spots to just the skeleton of the leaves behind. My dad (go to gardener advice guy) told me to spray with insecticidal soap?
I just got something that was for Rose pests a Lowe's and sprayed the rose down. It took a few applications spread out over weeks to get them all gone, and my rose didn't really recover that yeah because the damage was so bad I had to cut a lot off.
This year I sprayed at the first sign of the leaves spotting. Fingers crossed it works!
Bayer makes a 3-n-1 product that will take care of them. One capful in a bucket of water, water it into the roots every 4-6 weeks, up to 3/4 times a year.
It fertilizes as well as has disease and bug control. It's about $20 at a hardware store or garden center.
Not Japanese Beetles. They won't show up for another month, and when they do, they'll be highly visible during daylight hours. They also have a strong preference for rose petals over rose foliage.
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