Rose problem

Asked May 24, 2018, 2:31 PM EDT

Can you identify the problem with this rosebush? Is it rose rosette disease?

Anne Arundel County Maryland

1 Response

This looks like heavy damage from rose slug sawfly larvae. It is a very common problem in roses, including the Knock-outs. To control heavy infestations, use horticultural oil or spray with spinosad insecticide. Read and follow the label instructions when you use these products. Target the undersides of the leaves to get good coverage. Here is additional information about rose slugs and how to manage them:

We do not see any symptoms of rose rosette virus.