Received for publication February 23, 1977. Mention of a trademark name or a proprietary product does not constitute a guarantee or warranty of the product by the USDA, and does not imply its approval to the exclusion of other products that may also be suitable.
Research Plant Pathologist, Fruit Laboratory, Plant Genetics and Germ-plasm Institute. Assistance with SEM photography by Gordon Carpenter is gratefully appreciated.
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