Normal response of crops at onset of disease is to fight the invading organisms. As a result, bio-chemicals are produced in plant sap : These biochemicals are called as prohibitins and phytoalexins which stop the spread of disease. Plant vigour is maintained to ward off diseases. Many plants such as Peepal, Banyan, Neem etc. thus remain naturally healthy.
Most of the productive crops lack natural prohibitins and phytoalexins. These biochemicals are introduced by spray of on the foliage of the crops.
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