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Disease Control and Pest Management

Prevention of Ozone Injury to Plants by a New Protectant Chemical. J. E. Carnahan, Research Supervisor, Central Research & Development Department, Experimental Station, E. I. du Pont de Nemours & Co. (Inc.), Wilmington, DE 19898; E. L. Jenner(2), and E. K. W. Wat(3). (2)(3)Research Biologist, and Research Chemist, respectively, Central Research & Development Department, Experimental Station, E. I. du Pont de Nemours & Co. (Inc.), Wilmington, DE 19898. Phytopathology 68:1225-1229. Accepted for publication 16 January 1978. Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1225.

The new chemical N-[2-(2-oxo-1-imidazolidinyl) ethyl]-N’-phenylurea (abbreviated EDU) protects plants against ozone injury. It was effective by foliage and root applications. Dose-response measurements on Pinto beans treated by foliage spray showed that the ozone dose required to cause 50% leaf area injury (ED₅₀) increased linearly with the quantity of this protectant applied. A 500-μg/ml foliage spray to runoff increased the ozone resistance (ED₅₀) of Pinto bean about 30-fold relative to unprotected controls.