Green Worms with Orange Heads on Potted Roses: Sawfly Larvae (Rose Slugs) and Organic Control

Ron: Potted roses, green worms with orange heads eating leaves. Novice, 3 years growing. Avoids insecticides if possible.

ID: Rose Slugs (Sawfly Larvae)

Not caterpillars—no prolegs. Skeletonize leaves (windowpane then holes). Multiple generations/year.

Organic Controls

1. Strong water jet – knocks off, repeat daily.
2. Insecticidal soap – coats, suffocates. Spray undersides.
3. Spinosad (Captain Jack's, Monterey) – organic, eats through, very effective.
4. Neem oil – disrupts feeding/molting.
5. Marigolds – companion repellent (limited proof, but harmless).

Potted Rose Reality

Pots = stress = pest magnets. Upgrade to 20"+ pots, quality mix, daily watering in heat, regular feeding. Healthy roses resist pests better.