Those look like aphids, possibly dead going by their tan coloration. When well fed aphids die, they remain right where they attached themselves to leaves or stems for a while before falling off......a macabre scene.

Conventional insecticides labeled to kill aphids are very effective. Organic means are a bit trickier, especially oily sprays like insecticidal soap and Neem oil. Foliage damage with the organics can occur if sprayed when its too hot, and/or when its sunny.

Success can be had when large gatherings of aphids occur, primarily at growing tip sites, by just directing a spray of plain, garden hose water at them. More than one time may be needed this way....again the next day(s), until the aphids have bee flushed off. They can return, but not always......certainly not likely the ones you just washed off, which were destroyed, others from elsewhere can reinfest.

That's why I like using a conventional spray listed for aphids the best.

Moses.

Thanks when I tried conventional spray it damaged these roses, tonight I just sprayed Insecticidal soap , and will spray deadbrew in couple of days. There are some holes too