WSU Extension

Hortsense

Lawn and Turf
 
Disease
2,4-D damage 
Algae 
Anthracnose/Basal crown rot 
Brown blight 
Brown patch 
Curvularia blight (Fading out) 
Dog injury 
Dollar spot 
Fairy ring and mushrooms 
Leaf spot 
Microdochium patch (Pink snow mold) 
Moss 
Necrotic ringspot 
Powdery mildew 
Pythium crown and root rot 
Red thread 
Rusts 
Septoria leaf spot (Tip blight) 
Slime molds 
Take-all patch 
Thatch 
Typhula blight (Gray snow mold) 
Yellow patch 
Insect
Ants 
Billbugs 
Chinch bugs 
Cutworms 
European crane fly 
Leafhoppers 
Moles 
Sod webworm 



print version| pdf version| email url    
Caption: Redbacked cutworm
Photo by: K. Grey
  
Lawn and Turf : Cutworms
(revision date: 3/10/2017)


Biology
Cutworms 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. Cutworms feed by chewing leaf blades or cutting through stems near the soil line. Cutworms typically spend the day just beneath the soil surface or in the thatch. Weeds are the primary food source for cutworms, which may spread into lawns when numbers are high. They cause little real damage to lawn grasses. Cutworm infestations may be common in older lawns, particularly those with a lot of bentgrass.
Management Options

Non-Chemical Management
  • Control weeds in and near lawn areas.
  • Encourage natural enemies of cutworms including birds and spiders.
  • Hand-pick and kill cutworms when noticed.
Select non-chemical management options as your first choice!

Chemical Management

One of the following products may be used if this problem is identified. Most lawn insecticides are highly toxic to bees. Mow or remove weed flowers before applying.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Bull's-Eye Bioinsecticide
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 62719-314-56872
  • Monterey Garden Insect Spray [Organic]
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 62719-314-54705
  • 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.
Images

+ Show larger images

 
Caption: Redbacked cutworm
Photo by: K. Grey
Caption: Spotted cutworm
Photo by: K. Grey
Caption: Cutworm eggs
Photo by: A.L. Antonelli