WSU Extension


Black mold 
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Brand canker 
Bullheading (cold damage) 
Common canker 
Crown gall 
Downy mildew 
Powdery mildew 
Leafcutting bees 
Redhumped caterpillar 
Root weevils 
Rose aphids 
Rose galls 
Rose leafhopper 
Rose midge 
Spider mites 
Tobacco budworm 
Western spotted cucumber beetle 

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Caption: Rose slug and damage
Photo by: A.L. Antonelli
Rose : Roseslug
(revision date: 4/4/2022)

Rose slugs are small yellow-green larvae (about 1/4" long) that skeletonize the upper leaf surface. Signs of feeding include dry brown blotches, where all of the leaf except the veins and the lowest layer of leaf tissue are removed. Rose slugs are not true slugs, but are actually the larvae of a sawfly. They rarely occur in large numbers but can do considerable aesthetic damage.
Management Options

Non-Chemical Management
  • Hand-pick and destroy individual rose slugs.
  • Wash rose slugs off foliage with a strong stream of water.
Select non-chemical management options as your first choice!

Chemical Management

Apply when first noticed. These products are toxic to bees. Sevin (carbaryl) is particularly dangerous to bees. Avoid using carbaryl if there is any possibility of pesticide drifting onto nearby blooming plants.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Bonide Captain Jack's Deadbug Brew R-T-U [Organic]
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 4-472
  • GardenTech Sevin Conc Bug Killer
    Active ingredient: carbaryl  |  EPA reg no: 264-334-71004
  • Safer Brand BioNEEM Multi-Purpose Insecticide & Repellent Conc [Organic]
    Active ingredient: azadirachtin  |  EPA reg no: 70051-6-42697
  • This list may not include all products registered for this use.

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Caption: Rose slug and damage
Photo by: A.L. Antonelli