WSU Extension

Hortsense

Cucumber, Pumpkin, Squash
 
Disease
Angular leaf spot 
Cucumber mosaic virus 
Curly top (Beet curly top virus) 
Damping-off 
Pollination failure 
Powdery mildew 
Root rot 
Verticillium wilt 
White mold 
Insect
Brown marmorated stink bug 
Slugs 
Spider mites 
Squash bug 
Western spotted cucumber beetle 



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Caption: Western spotted cucumber beetle
Photo by: K. Grey
  
Cucumber, Pumpkin, Squash : Western spotted cucumber beetle
(revision date: 3/10/2017)


Biology
The western spotted cucumber beetle is a pest of many ornamentals and vegetables. About 1/4" long, the adult beetles have yellow wing covers with black spots. The rest of the body is black. Adults feed on leaves of plants, while the larvae feed on the roots of some plants.
Management Options

Non-Chemical Management
  • Pick and kill individual beetles.
Select non-chemical management options as your first choice!

Chemical Management

Repeated applications are necessary most seasons. Apply when first observed on plant. Products containing esfenvalerate are toxic to bees. Do not apply any of the products listed on or near blooming plants. To minimize risk to bees, apply in the evening after bees have stopped foraging for the day.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Azamax Botanical Insecticide, Miticide, & Nematicide [Organic]
    Active ingredient: azadirachtin  |  EPA reg no: 71908-1-81268
  • Bug Buster-O [Organic]
    Active ingredient: pyrethrins  |  EPA reg no: 1021-1771-54705
  • Monterey Bug Buster II
    Active ingredient: esfenvalerate  |  EPA reg no: 1021-1778-54705
  • 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

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Caption: Western spotted cucumber beetle
Photo by: K. Grey
Caption: Western spotted cucumber beetle
Photo by: A.L. Antonelli