The Nature and Importance of Physiologic Specialization in Phytopathogenic Fungi

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Abstract
Within spp. of most pathogenic fungi there are many biotypes or physiologic races that differ chiefly or solely in physiologic rather than morphologic characters. It is the practice to apply the term physiologic race to lines or collections of plant pathogenic fungi if the most conspicuous or most important differences between them are in pathogen-icity, even though there may be appreciable morphologic differences also. It is necessary to know the number, geographic distribution, and pathogenic potentialities of races to understand the development of epidemics and the regional and seasonal variation in the disease resistance of many crop plants. The knowledge of physiologic specialization is important in formulating plant quarantine regulations and in the breeding of disease-resistant vars. There are indications that it may be important also in the control of diseases by the use of fungicides and soil management practices.
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