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How to Manage Pests

UC Pest Management Guidelines


Dry Beans

Black Root Rot

Pathogen: Thielaviopsis basicola

(Reviewed 8/07, updated 8/07)

In this Guideline:


SYMPTOMS

This disease occurs on blackeyes as well as on other dry bean types. Brown to black necrotic tissue develops on the below ground stems and roots. Fissures often develop in necrotic cortex tissue. Using a compound microscope the fungus can be identified in diseased tissue by the production of dark chlamydospores.

COMMENTS ON THE DISEASE

The fungus survives over a year in soil as chlamydospores. In blackeyes, Thielaviopsis basicola appears to be active on affected roots throughout the growing season.

MANAGEMENT

Long-term crop rotation to nonsusceptible crops such as grasses may help to reduce soil inoculum. Avoiding excess irrigation or long drought stress may help.

PUBLICATION

[UC Peer Reviewed]

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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Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2007 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See How to manage pests, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/r52100711.html revised: August 8, 2007. Contact webmaster.