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Suppression of Oxidant Injury by Benomyl: Effects on Yields of Bean Cultivars in the Field¹

ABSTRACT

Bean (Phaseolus vulgaris L.) cultivars ‘Tempo’ and ‘Pinto III’, which are sensitive to oxidant injury, and cultivar ‘Tenderwhite’, which is resistant to oxidant injury, were grown in field plots. Some plants were sprayed once a week with the fungicide benomyl at 2.4 g/liter to suppress oxidant injury and allow for yield comparisons. Benomyl suppressed 75–80% of the oxidant injury on Pinto and Tempo, but did not suppress slight injury on Tenderwhite. Nonsprayed plants of Pinto and Tempo, with extensive oxidant injury, matured faster and set fruit earlier than did sprayed plants with slight visible injury. Initial fruit set was somewhat greater on nonsprayed plants of resistant Tenderwhite. Significant differences between sprayed and nonsprayed plants for total yields and fresh and dry weights of plant remains at harvest were observed only with Tempo, which was the most sensitive to oxidant injury.

Key Words: antioxidant fungicide • oxidant air pollution • plant productivity

¹ Contribution from the Suburban Exp. Sta., Univ. of Massachusetts, 240 Beaver St., Waltham, Mass. 02154.

² Assistant Professor, Professor, and Technician, respectively.

Received for publication February 15, 1973.