Vol. 103 (1990): Proceedings of the Florida State Horticultural Society Vegetable Field Evaluation of Crisphead and Butterhead Lettuce for Downy Mildew Resistance and Characterization of Virulence Phenotype PDF L. E. Datnoff, R. T. Nagata, R. N. Raid, T. M. Schettini, R. W. Michelmore Published 1991-06-01 PDF