Raspberry: Loopers
Photo by: Unknown
Biology
Loopers are green caterpillar 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
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- 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.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Apply to control loopers when first noticed.
- Use a spreader-sticker with liquid Bt formulations.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
Additional Images
Photo by: A.L. Antonelli
Photo by: OSU slide library
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