Van der Plank (1963, 1968) postulated that all disease resistance in plants can be classified into one of two categories which he called “vertical” and “horizontal”. Vertical defines a type of interaction between host and pathogen, horizontal defines another type of interaction. No other kind of interaction is possible, in spite of various complications due to mixtures of both interactions, and interactions with other factors such as those of the environment.
KeywordsHost Individual Constant Ranking Bordeaux Mixture Protective Chemical Vertical Gene
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