Henry A. RobitailleDepartment of Horticulture, Purdue University, West Lafayette, IN 47907
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K. S. Yu
K. S. YuDepartment of Horticulture, Purdue University, West Lafayette, IN 47907
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Contributor Notes
Received for publication March 5, 1980. Journal paper no. 7989 for the Purdue University Agricultural Experiment Station.
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.