Received for publication February 25, 1972. Published as Technical Paper No. 3285 of the Oregon Agricultural Experiment Station, Department of Horticulture.
Appreciation is expressed to A. A. Duncan for his suggestions during initial planning of this study. The technical assistance of Robert Tsuha and Arthur Schafroth is gratefully acknowledged. Part of the financial support was provided by Ortho Division, Chevron Chemical Company.
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