WSU Extension

Hortsense

Strawberry
 
Disease
Common leaf spot 
Gray mold 
Red stele 
Viruses 
Insect
Aphids 
Brown marmorated stink bug 
Cutworms and armyworms 
Leafrollers 
Mites 
Root weevils 
Slugs 
Spittlebugs 
Spotted wing Drosophila (SWD) 



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Caption: Western yellow stripe armyworm
Photo by: Unknown
  
Strawberry : Cutworms and armyworms
(revision date: 6/8/2015)


Biology
Cutworms and armyworms are the larvae of noctuid moths. These common moths are medium-sized with fairly dull coloration. The greenish, grayish, or tan caterpillars are hairless, nocturnal, and generally spotted, striped, or otherwise marked. They may be 1/4" to 1" in length and tend to curl up when disturbed. They may climb into the plant and feed on foliage, buds, flowers, or fruit. Armyworm behavior is similar to that of cutworms, but armyworms feed in large groups instead of individually. They tend to be voracious feeders. The caterpillars typically spend the day just beneath the soil surface or under debris near the host. Weeds are a primary food source for both cutworms and armyworms.
Management Options


Non-Chemical Management
  • Control weeds and grasses in and near the garden.
  • Remove debris around plants that provides shelter for cutworms.
  • Hand-pick night-feeding larvae, when practical. Scratch soil at the base of damaged plants to find larvae in the daytime.
  • Encourage natural enemies of caterpillars including birds, spiders, and predacious insects. Avoid use of broad-spectrum insecticides that kill beneficial insects.
Select non-chemical management options as your first choice!

Chemical Management

Apply when pests are present. Bacillus thuringiensis will provide some control if caterpillars eat enough of it. 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.
Images

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Caption: Western yellow stripe armyworm
Photo by: Unknown
Caption: Bertha armyworm
Photo by: K. Grey
Caption: Cutworm eggs
Photo by: A.L. Antonelli
Caption: Western yellow stripe armyworm adult
Photo by: A.L. Antonelli