1.

Describe the classification oftrees on the basis of their spread.

Answer»

Study of plant dis­eases in relation to their occurrence (INTERACTION of populations of plants, pathogens and environment) is known as EPIDEMIOLOGY. There may be infectious disease and contagious disease. A disease which spreads SLOWLY and is incited by a transmissible pathogen is referred as infectious disease, and that which spreads RAPIDLY is a contagious disease.



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