Abstract
Plant pathology literature provides ample evidence of growing knowledge of the biochemical, physiological, and genetic nature of host-pathogen interactions. Equally important, but less often studied, aspects of host-pathogen interactions are the complementary genetic changes that occur in the coevolution of host and pathogen populations. It is widely accepted that this coevolution of plants and their pathogens can be understood best in the context of integrated host-pathogen systems (e.g. 60). Pathogen population studies have been limited by a shortage of genetically well-defined host-pathogen systems based on easily scored genetic markers. Such markers are necessary to make use of the concepts of population genetics in improving our knowledge of host-pathogen population interactions. In particular, understanding the processes that drive genetic change in pathogen populations is essential to develop adequate and proper methods of disease control. Incorporating princi-
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