WSU Extension

Hortsense

Rose : Redhumped caterpillar
(revision date: 4/22/2015)


Biology
The redhumped caterpillar is the larvae of a 1" gray-brown moth. The mature larvae are yellow with a red head and hump, and have orange, black, and white lengthwise stripes. The body of the caterpillar also has dark "spikes" on it. Young redhumped caterpillars are found in clustered colonies which disperse as caterpillars mature. They eat entire leaves (except the major veins).
Management Options

Non-Chemical Management
  • Cut out and destroy colonies before they disperse.
  • Hand-pick and destroy individual caterpillars.
Select non-chemical management options as your first choice!

Chemical Management

Apply when caterpillars are observed. Bacillus thuringiensis (Bt) will control leafrollers only if they are actively feeding. Use a spreader-sticker with liquid Bt formulations.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • ferti-lome Broad Spectrum Insecticide
    Active ingredient: bifenthrin  |  EPA reg no: 53883-228-7401
  • ferti-lome Dipel Dust
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 7401-290
  • Safer Brand Caterpillar Killer for Trees, Shrubs & Vegetables Conc II [Organic]
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 70051-106-42697
  • This list may not include all products registered for this use.
Images
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Caption: Redhumped caterpillars
Photo by: A.L. Antonelli
Caption: Redhumped caterpillar adult
Photo by: A.L. Antonelli