Author(s): Kupozulu Swuro, Bilal Ahmad Wani and Khursheed Ahmad Wani
Any biotic or abiotic agents, which induce the
disease in plant, are referred as the cause of
diseases. Organisms that cause infectious disease
include fungi, bacteria, viruses, viroids, virus like
organisms, phytoplasmas, protozoa, nematodes
and parasitic plants and environmental conditions
such as lack or excess of nutrients, moisture, light,
etc. to presence of toxic chemicals in Air or soil.
Plant disease can be defined as “a series of
harmful physiological processes caused by
continuous irritation of the plant by a primary
agent” or “physiological or structural dis-balance in
plant caused by certain external agencies.
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