How to Manage Pests

UC Pest Management Guidelines

Dry Beans

Ozone Injury

(Reviewed 8/07, updated 8/07)

In this Guideline:


Ozone symptoms vary depending on the type of pollutant and concentration, the cultivar, and environmental conditions. The most common symptoms of ozone damage on field-grown beans is bronzing, in which a purple-brown discoloration develops on the upper surface of the leaves.


Ozone injury is caused by high levels of ozone (O3) in the air. Ozone is generated by the interaction of atmospheric components and the products of combustion engines. The problem is favored under conditions of high temperature and light intensity.


Some tolerant cultivars are available.


[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Dry Beans
UC ANR Publication 3446

Abiotic Disorders

R. M. Davis, Plant Pathology, UC Davis
C. A. Frate, UC Cooperative Extension, Tulare County

Acknowledgment for contributions to Abiotic Disorders:
A. E. Hall, Botany and Plant Sciences, UC Riverside
Acknowledgment for contributions to Diseases/Abiotic Disorders:
S. R. Temple, Plant Sciences, UC Davis

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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