If the holes are actually half moon shaped cut outs in the leaves, it is likely just Cutter Bees taking some foliage to make their nests. I just leave them alone as they usually stop after a while when they are done with their cycle. If the holes are more out in the center of the leaves, then it could be a rose slug or perhaps another insect. If the roses leaves have alot of holes in them it is probably best to spray the rosebush with an insecticide. Starting with something made by Safer or one of the more earth friendly types. If that does not gain control, the using somthing like Ortho Bug B Gon Max or Sevin may well be in order.
Answered on July 1, 2011
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