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How to Manage Pests
UC Pest Management Guidelines
Dry Beans
Bacterial
Brown Spot
Pathogen: Pseudomonas
syringae pv. syringae
(Reviewed 8/07,
updated 8/07)
In this Guideline:
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Bacterial brown spot symptoms on leaves appear as oval spots that
have dead (necrotic) tissue in the center surrounded by a narrow zone of
light-green to yellow tissue. Water-soaking and slimy ooze is rarely seen with
this disease. The spots may grow together and the centers of the spots often
fall out, resulting in an overall tattered appearance of the leaf. On pods,
small dark brown spots develop that result in distorted pod growth.
Bacterial brown spot occurs sporadically and rarely in California.
It is readily distinguished from the more serious common and halo blights based
on leaf symptoms.
Control is similar to that for common and halo blights: plant
certified bean seed, rotate crops, and clean crop and other host debris from
the field after harvest to help prevent outbreaks of brown spot.
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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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