Date 11/8/22
Holes in rose blossoms can be caused by chewing insects including Fuller rose beetle, hoplia beetle, and rose curculios. The rose curculio (Merhynchites bicolor) and western rose curculio (M. wickhami) feed on caneberries and roses. Here is the information on Rose Beetles and also information on Roses from the University of California to assist you with roses. I hope that you find this helpful.
If you are a rose lover, you may enjoy the San Diego Rose Society link too.