Plant pathology is warmly connected to the health of plant and the invention of crop yields. It has special significance in agricultural countries like India which are fast developing and where much still needs to be done in the renewal of organize measures against plant diseases. In nature for any variety or species of plant there is a set of environmental conditions which favours its optimum development. Diseased plants are distinguished by changes in their structure or physiology of local price which are brought about by unfavourable environment or by one or another parasitic-agency. It is hoped that this work will enrich the background of those who wish to study plant pathology intensively.
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