Bean, Snap (Phaseolus vulgaris)-Web Blight

Latest revision: 
March 2024

Cause Rhizoctonia solani, a fungus that is in most soils and has a wide host range. It has been observed on pods in the Willamette Valley.

Symptoms Pods have brownish, irregular lesions.

Cultural control

  • Rotate with cereals or corn.

Chemical control

  • Strobilurin fungicides (Group 11) are labeled for use. Do not make more than one (1) application of a Group 11 fungicide before alternating to a labeled fungicide with a different mode of action.
    • Quadris Flowable at 6 to 15.5 fl oz/A on 7- to 14-day intervals. May be applied the day of harvest. 4-hr reentry.
  • Premixes are available for use.
    • Quilt (Group 3 + 11) at 14 fl oz/A or Quilt Xcel (Group 3 + 11) at 10.5 to 14 fl oz/A on a 7- to 14-day interval for no more than three (3) applications. Preharvest interval is 7 days. 12-hr reentry.
    • Miravis Neo (Group 7 + 3 + 11) at 13.7 fl oz/A. The first application should be applied before disease is established and no later than the onset of flowering. Apply on a 14-day interval. No more than two (2) applications per year. May be applied up to 14 days before harvest. 12-hr reentry.