,įusarium spp., Macrophomina phaseolina, Pyricularia oryzae, Pythium spp., Rhizoctonia solaniĪlternaria brassicola, Fusarium oxysporum f. Solani, Pythium sp.įusarium spp., Pythium spp., Rhizoctonia spp., Sclerotium rolfsii, Streptomyces scabies, Verticillium spp. Macrophomina phaseolina, Pythium, Sclerotium rolfssiįusarium oxysporum f.sp. The reduction of inoculums density or disease producing activities of a pathogen or parasite in its active or dormant stage by one or more organisms accomplished naturally or through manipulation of the environment, host or by introduction of one or more antagonists. However, their use poses certain problems of residues left over on crops, which has gained considerable importance in recent years, not only in India but also throughout the world.
Although several methods are followed for this purpose, disease control by chemicals is the promising one especially under intensive cropping programmes. Therefore, control of plant diseases assumes greater importance. The losses are going to increase with change in agricultural practices and our country, which is tropical with warm and humid climate, provides ideal conditions for development and spread of diseases of crops cultivated under good management systems.
Biocontrol Agents and Mechanism Involved in Biological ControlĪccording to the estimate of FAO, the annual losses to crop production due to plant diseases alone are about 12 per cent.
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