Received for publication Dec. 10, 1981. Journal Article No. 10245 from the Michigan 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.
We extend our appreciation to Steve Fouch and William Chase for excellent technical assistance on this project. This project was supported in part by a grant from Stauffer Chemical Company and the North American Strawberry Growers Association.