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Dry Beans

Pests and their Damage—Harvest

On this page
  • Armyworm
  • Corn earworm
  • Lygus bug
  • Weevil
  • Nightshade
  • Common bacterial blight
  • Bean anthracnose
  • Halo blight
  • White mold

Monitor pod and seed damage at harvest to identify pests that escaped your management program. Look for the presence or any evidence of armyworms, stink bugs, lygus bugs, and diseases. Keep a record of problems that you observe. Knowledge of the current year's problems will help you plan for next year’s practices.

Use the photos below to distinguish symptoms due to various diseases, insects, or abiotic factors. Names link to more on identification and management or biology.

Click on photos to enlarge

Armyworm and corn earworm on beans
Armyworm and corn earworm larvae and damage
Identification tip: Larvae chew holes in pods and beans.

Armyworm damage
Armyworm damage
Identification tip: Chew holes in pods and beans.

 

Lygus bug damage
Lygus bug damage
Identification tip: Pitting and distortions on red beans.

Lygus bug damage
Lygus bug damage
Identification tip: Blemishes and stunted seeds.

Weevil damage
Weevil damage
Identification tip: Chew holes in stored beans.

Nightshade berry staining
Nightshade berry staining
Identification tip: Nightshade berry juice stains bean seeds and causes debris to stick.

Common bacterial blight
Common bacterial blight damage
Identification tip: Pods with dark irregular spots.

Bean anthracnose
Bean anthracnose damage
Identification tip: Sunken cankers on pods.

Halo blight
Halo blight damage
Identification tip: Sunken spots on pods.

White mold
White mold
Identification tip: Bleached or tan colored pods.

 

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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