Reduction Air Pollution Injury to Foliage of Chrysanthemum morifolium Ramat. Using Tolerant Cultivars and Chemical Protectants,1

in Journal of the American Society for Horticultural Science
Gerald L. KlingamanUniversity of Maryland, College Park

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Conrad B. LinkUniversity of Maryland, College Park

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Forty-five chrysanthemum cultivars exposed to ozone in a controlled environment chamber exhibited a wide range of sensitivity with several showing sufficient sensitivity to be damaged by ambient oxidant concentrations. Chemical protection of foliage from ambient air pollution was tested on pollution sensitive ‘King’s Ransom’ and pollution tolerant ‘Yellow Jess Williams’. Chemical protectants included 1) benomyl, 2) thiophanate ethyl, 3) triarimol, 4) ancymidol, 5) SADFI, and 6) Folicote. No visible injury was observed on unprotected ‘Yellow Jess Williams’, but extensive injury occurred on older foliage of ‘King’s Ransom’. Full season protection was observed on ‘King’s Ransom’ receiving treatments of benomyl, thiophanate ethyl or ancymidol but ancymidol delayed anthesis and reduced flower count.

Contributor Notes

Received for publication June 6, 1974. Scientific Article A1998 Contribution No. 4940 of the MD Agricultural Experiment Station, Department of Horticulture.

Research conducted in partial fulfillment for the degree of Doctor of Philosophy at the University of Maryland. Present address, Department of Horticulture, University of Arkansas, Fayetteville.

The authors express appreciation to Robert Howell and the Plant Air Pollution Laboratory, USDA, Beltsville, MD, for fumigation facilities: Yoder Brothers, Inc., Barberton, OH, for cuttings; Pennwalt Corp., Tacoma, WA, for thiophanate ethyl; Elanco Products Co., Indianapolis, IN, for trianimol and E. J. Koch, USDA Biometrics Division, Beltsville, MD, for assistance with the statistical analysis.

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