Chapter 12. Martin S. Wolfe, John A. Barrett. 1977. Population genetics of powdery mildew epidemics. Pages 151-163. In: Peter R. Day (editor). The Genetic Basis of Epidemics in Agriculture. Annals of the New York Academy of Sciences No. 287. The New York Academy of Sciences, New York, New York, 400 pages.

Keywords: identification of host resistance and pathogen virulence, field analysis of virulence frequencies, six major resistances to barley mildew in the UK, varietal diversification, variety mixtures,

selection for virulence, sequential introduction of resistant host varieties, combining resistances within a single host genotype, varietal diversification between fields, modification of strategies