Roseslugs have become a very "popular" insect on roses in recent years. Roseslugs are not slugs, but are small worms. Actually they are the larvae of a small wasp called a sawfly.
Their damage is very distinctive. There are chewed translucent areas next to completely chewed holes. This type of damage is caused when the young larvae start eating on one surface of the leaf, skeletonizing it. As they mature, they chew complete holes in the leaf.
Depending on the weather, there can be as many as 2 to 6 generations a season, so this is a problem that has to be dealt with.
Spraying is the quickest way to control roseslugs. Organic options are neem oil or pyrethrin. Spray at least twice, a couple of days apart. Please call or stop in if you have questions!