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peer-reviewed research article

Ozone air pollution increases spray oil phytotoxicity

authors

William A. Retzlaff, Department of Viticulture and Enology, UC Davis
William W. Barnett, UC Cooperative Extension. Kearney Agricultural Center
Larry E. Williams, Department of Viticulture and Enology, UC Davis, stationed at Kearney Agricultural Center
Theodore M. DeJong, Department of Pomology, UC Davis

publication information

California Agriculture 50(2):21-23. DOI: 10.3733/ca.v050n02p21. March-April 1996.

abstract

In 1992, a moderate to severe outbreak of spider mites was found in ‘Casselman’ plum trees exposed to three atmospheric ozone air pollution treatments. Five days after spraying with a summer application of a medium grade oil, phytotoxic effects were observed on the foliage of trees exposed to ambient or higher atmospheric ozone air pollution. This research indicates that ozone air-pollution stress may predispose plants to increased phytotoxicity from summer oils.

author affiliations

W.A. Retzlaff was Postdoctoral Research Associate, Department of Viticulture and Enology, UC Davis, stationed at Kearney Agricultural Center, and is currently Postdoctoral Associate, Boyce Thompson Institute for Plant Research at Cornell University, Tower Road, Ithaca, NY; W.W. Barnett is former Area IPM Farm Advisor, UC Cooperative Extension. Kearney Agricultural Center; L.E. Williams is Professor, Department of Viticulture and Enology, UC Davis, stationed at Kearney Agricultural Center; T.M. DeJong is Professor, Department of Pomology, UC Davis.

author notes

We thank P. Biscay, W. Yang, and N. Ebisuda for technical assistance; Dr. C.G. Summers and Dr. J.E. Dibble for critical manuscript review; and J. Coviello for word-processing assistance.

This study was funded in part by a grant from the California State Air Resources Board. The statements and conclusions of this report are those of the University of California and not necessarily those of the California State Air Resources Board. The mention of commercial products, their source, or their use in connection reported herein is not to be construed as either an actual or implied endorsement of said products.


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