Received for publication January 4, 1978. Scientific paper No. 4937, College of Agriculture Research Center, Washington State University, Pullman, WA 99164. Project No. 1475.
Horticulturist and Soil Scientist and Associate Plant Pathologist, respectively. The authors are indebted to I. C. Chmelir for the leaf analyses and to Dorothy Mellon for greenhouse assistance.
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