WSU Extension


Boron deficiency 
Fruit rot and cane Botrytis 
Phytophthora root rot 
Powdery mildew 
Spur blight 
Yellow rust 
Brown marmorated stink bug 
Cutworms and armyworms 
Dryberry mite 
Raspberry beetle (raspberry fruitworm) 
Raspberry crown borer 
Root weevils 
Rose stem girdler 
Spider mites 
Spotted wing Drosophila (SWD) 

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Caption: Cabbage looper
Photo by: Unknown
Raspberry : Loopers
(revision date: 6/8/2015)

Loopers are green caterpillars up to about 1 1/2" in length. They may have pale or dark stripes along the body. They are distinguished by their characteristic looping or "measuring-worm" movement. Loopers feed on leaves of many plants, chewing holes in the leaves or feeding along leaf margins. The adult of the alfalfa looper, a species common on raspberry, is a mottled brown moth with silver markings. Wingspan is approximately 1 1/2". The primary damage caused by loopers is the contamination of harvested fruit.
Management Options

Non-Chemical Management
  • Hand-pick and destroy any caterpillars or cocoons found on leaves.
  • Natural enemies of caterpillars include predacious beetles, parasitic wasps, and birds. Avoid use of broad-spectrum insecticides when possible to conserve beneficial insects.
Select non-chemical management options as your first choice!

Chemical Management

Apply to control loopers when first noticed. 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.
  • Bonide Captain Jack's Deadbug Brew R-T-U [Organic]
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 4-472
  • Bonide Thuricide BT Conc
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 4-226
  • Safer Brand Garden Dust RTU [Organic]
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 36488-25-42697
  • This list may not include all products registered for this use.

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Caption: Cabbage looper
Photo by: Unknown
Caption: Celery looper pupa
Photo by: A.L. Antonelli
Caption: Alfalfa looper adult
Photo by: OSU slide library