Identifying and Treating Rose Slug Damage on Container-Grown Knock Out Roses

Classic Signs

Lacy, skeletonized leaves on the upper canopy of a potted Knock Out rose are almost always caused by rose slugs (sawfly larvae). They feed on the undersides, so check there for small, green, slug-like larvae.

Treatment Options

• Any rose-labeled insecticide (systemic or contact) will control them.
• For containers, a systemic granular product worked into the soil surface is easy and effective.

Don't Panic

Roses can produce three sets of leaves per season. Once the larvae are controlled, the plant will push fresh foliage. Fertilize lightly after treatment to support regrowth.