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How to Manage Pests
UC Pest Management Guidelines
Dry Beans
Fusarium
Root Rot
Pathogens:
Fusarium solani f. sp. phaseoli (blackeyes, common bean) and
Fusarium solani f. sp. pisi (garbanzo beans)
(Reviewed 8/07,
updated 8/07)
In this Guideline:
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Fusarium root rot is characterized by brick red lesions of variable
size with diffuse margins that develop on belowground stems and tap roots. The
red color gradually turns brown with age. Longitudinal fissures develop in the
cortical tissue of affected areas. In severe infections, the entire root system
may be attacked and destroyed. If the surface of the lesion is scraped away,
small red flecks can be seen in affected tissue; this is a good diagnostic
characteristic. In some plants, roots are initiated above the lesion.
The causal fungi survive for several years as chlamydospores in the
soil. The disease is most commonly encountered during mid- to late season in
fields with a long history of bean culture. The disease causes little damage to
unstressed plants but under conditions of reduced root growth caused by
drought, poor nutrition, or oxygen stress caused by wet soil, Fusarium root rot
can cause early maturity (early cutout) and marked reduction in yield.
Long-term (3 years) crop rotation out of beans may reduce soil
inoculum. Provide optimal growing conditions, avoiding stress caused by excess
water, prolonged drought, soil compaction, etc. Although no bean line is
immune, some cultivars are more tolerant to the disease than others.
![[UC Peer Reviewed]](/IMAGES/logo-ucpeerreviewed.jpg)
UC IPM Pest Management Guidelines: Dry
Beans
UC ANR Publication 3446
Diseases
R. M. Davis, Plant Pathology, UC Davis
Acknowledgment for contributions to Abiotic Disorders:
A. E. Hall, Botany and Plant Sciences, UC Riverside
Acknowledgment for contributions to virus sections in Diseases:
R. L. Gilbertson, Plant Pathology, UC Davis
Acknowledgment for co-authorship of Ascochyta Blight:
C. A. Frate, UC Cooperative Extension, Tulare Co.
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