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Sulphur Dioxide Fumigation of Cotton With Special Reference to Its Effect on Yield¹

Synopsis: The relationship between the percent of foliage area destroyed (X) and the percent of crop (Y) is expressed by the regression formula Y = 99.26 – 0.68X. There was no crop loss without visible leaf injury and no increase in the incidence of disease.

² Department of Agricultural Investigation, Phelps Dodge Corporation, Douglas, Ariz.

³ Teaching Assistant in Plant Pathology, University of Arizona, Tucson, Ariz. The authors express their gratitude to Dr. Henry Tucker, Agricultural Statistician, University of Arizona, for valued assistance with the statistical methods and to Dr. Wyatt W. Jones for helpful suggestions and advice.

Received for publication May 25, 1958.