Click on author name to view affiliation information
Graduate Research Assistant. Present address: Dept. of Plant and Soil Sciences, French Hall, Univ. of Massachusetts, Amherst, MA 01003.
Associate Professor. Present address: Dept. of Horticulture, Univ. of Wisconsin, Madison, WI 53706.
Received for publication 29 Dec. 1987. Scientific Article no. A-4564, Contribution no. 7558, of the Maryland Agricultural Experiment Station. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.