1Received for publication February 26, 1970.
2Department of Pomology. Appreciation is expressed to the Amchem Co. for donations of Ethrel, the Upjohn Co. for supplies of cycloheximide, and to the R. J. Reynolds Tobacco Co. for abscisic acid.
3On leave from the Istituto di Coltivazioni Arboree, Universita di Perugia, Perugia, Italy, with the support of a NATO Fellowship.
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