WSU Extension

Hortsense

Corn
 
Disease
Root, stalk, and ear rots 
Seed rot and seedling blight (damping-off) 
Smut 
Insect
Brown marmorated stink bug 
Corn aphids 
Corn earworm 
Cutworms and armyworms 
Earwigs 
Spider mites 
Western spotted cucumber beetle 



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Caption: Western spotted cucumber beetle
Photo by: K. Grey
  
Corn : 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

Esfenvalerate is toxic to bees. Do not apply products containing esfenvalerate 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.
  • 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