At this age, their small size makes them easier to control with insecticides. Older grasshopper nymphs and adults are quite mobile and begin to consume larger amounts of leaf material. Rose Slug Rose slugs are the larvae of a sawfly, a member of the wasp and bee family. Rose slugs injure rose bushes by chewing large holes or by skeletonizing the leaves. The worms feed on the underside of the leaves.
Infestations occur from early to middle summer.
The curculio can be recognized by its long snout, characteristic for weevils. The snout of this species is black while the rest of the body is bright red with a black under-surface. There is only one generation per season. The adults of that generation begin emerging when roses begin to bud, normally during the first week of June. The adult weevils chew holes in the buds to deposit their eggs.