Epidemiology-The study of disease outbreaks, their course, intensity, causes, and effects, as well as the different elements that influence them, is known as epidemiology or epiphytology. Based on the frequency of occurrence and geographic spread
J.E. Vanderplank-considered as father of epidemiology (1986) introduced the idea of horizontal and vertical resistance in plants and used the word "vertifolia effect" to characterise horizontal resistance.
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