Are you noticing windowpane-like holes or even complete holes in your rose leaves but can’t find any pests? The culprit may be rose slugs, a tiny, leaf-colored pest that feeds on the underside of rose leaves.

What Are Rose Slugs?

Despite their name, rose slugs aren’t slugs. They belong to the sawfly family and resemble tiny caterpillars in their early stages. These larvae feed on the undersides of rose leaves, causing anything from small holes to complete leaf skeletonization as they grow. While they may affect your rose’s appearance, they typically don’t harm the plant’s overall health.

How to Treat Rose Slug Damage

Rose slugs can have several generations per season, so consistent treatment is key. Here are three effective methods:

1. Hand Removal

Early in the morning, check the undersides of rose leaves and remove rose slugs by hand. This method is simple and highly effective.

2. Foliar Sprays

Use insecticidal soaps or horticultural oils, focusing on the underside of the leaves where rose slugs feed. Repeated application is often needed for the best results.

3. Systemic Insecticides

For a more long-lasting solution, apply a systemic insecticide such as 3-in-1 Rose Care, Optrol, or products by Bonide, Bayer, or Fertilome. This kills larvae as they feed on the leaves and works best if applied before visible damage, though it can still be effective afterward.

Tip: Hand removal and foliar sprays provide immediate control, but using both a systemic insecticide and a foliar spray offers comprehensive protection.

Need Help with Your Roses?

Do you have a gardening or rose question? Our experts are here to help! Contact us for personalized advice and care solutions.