Received for publication November 25, 1977.
Eastern Regional Research Center, retired.
Western Regional Research Center.
Science and Education Administration, Michigan State University, E. Lansing, Michigan.
We thank Mrs. Ruth D. Zabarsky (ERRC) for assistance with the photography, Mr. Franklin P. Rorer (ERRC) for assistance in the microscopy, Therese M. Dougherty for assistance with the analyses, and Mr. Richard Wolthuis and Dr. Clyde L. Burton (ARS-Michigan State University) for participation in the orchard trials. We also acknowledge the cooperation of Styer Brothers Orchards and McLachlan Orchards in providing facilities for our orchard trials.
Reference to branch or firm names does not constitute endorsement by the U.S. Department of Agriculture over others of a similar nature not mentioned.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
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