This article reviews the development of major concepts in the field of soilborne plant pathogens. In a previous essay (113), I emphasized rela tionships among components within, and interconnections between, concepts and theorems, whereas in this article I place greater emphasis on their development. The four major concepts that provide the framework for this review are: (a) that there exist in soil different ecological groups of root infecting fungi, designated as soil invaders and soil inhabitants; (b) inoculum potential, which includes as a component the stimulation of plant pathogens by root exudates; (c) that hosts may be predisposed to infection and disease by environmental stresses; and (d) that soil microorganisms can influence pathogen survival and development.
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Julie L. Lockwood (1988) studied this question.
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