WSU Extension


Bacterial Blights 
Common and yellow mosaics 
Curly top (Beet curly top virus) 
Fusarium root rot 
Gray mold 
White mold (Sclerotinia rot) 
Bean aphids 
Brown marmorated stink bug 
Cutworms and armyworms 
Spider mites 

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Caption: Fusarium root rot on bean
Photo by: R.S. Byther
Bean : Fusarium root rot
(revision date: 6/2/2014)

Root rot is a fungal disease which attacks the roots and underground stems of beans. Young infected plants show reddish-brown streaking on the stem or taproots. The streaks spread until the entire lower stem and taproot are discolored and decayed, and secondary roots may also be damaged. Plants with badly damaged root systems show aboveground symptoms of disease, including stunting and yellowing of the plants, premature leaf drop, reduced yield, and plant death. The fungus overwinters in the soil in diseased plant debris and can also survive in the soil for many years.
Management Options

Non-Chemical Management
  • Rotate crops. Allow five or six years between bean crops in the same location.
  • Some varieties are reported to be resistant to root rot. Among these are 'Aurora', 'Black Turtle', 'NW-59', 'NW-63', 'NW-410', 'NW-590', 'Rosa', 'Rufus', and 'Viva'.
  • Plant in well-drained soils.
  • Hill soil around plants to encourage formation of secondary roots.
  • Provide proper culture. Stressed plants are more likely to be damaged.
  • Remove plant debris from the garden. Destroy or discard (do not compost) diseased materials.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


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Caption: Fusarium root rot on bean
Photo by: R.S. Byther