In order for a disease to develop in plants, several circumstances must be achieved. This is commonly depicted in a diagram known as the disease triangle. The disease triangle illustrates how three favorable conditions must exist in order for a disease to occur. The existence of a pathogen, a susceptible host (plant), and suitable environmental factors are the three requirements. Stevens most likely first published the disease triangle picture in 1960, while previous plant pathologists undoubtedly understood the relationship between plant, pathogen, and environment. Hence, the graphic depicts one of the paradigms in plant pathology: the occurrence of a disease induced by a biotic agent necessitates the interaction of a vulnerable host, a virulent pathogen, and a disease-promoting environment. The removal of any one of these three causative components, on the other hand, prevents plant disease. The triangle will not be complete if one of the three factors is absent, and no disease ...
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