Bacterial Bioagents: Mode of Action and Application Methods for Crop Disease Management
Durga Prasad*
Dept. of Plant Pathology, College of Agriculture, Baytu, Agriculture University, Jodhpur, Rajasthan (344 034), India
R.P. Singh
Krishi Vigyan Kendra, West Champaran-II, Dr RPCAU, Pusa, Samatipur, Bihar (845 455), India
Ummed Singh
Dept. of Agronomy, College of Agriculture, Baytu, Agriculture University, Jodhpur, Rajasthan (344 034), India
DOI: NIL
Keywords: Antibiosis, Bacterial bioagents, Pseudomonas, Streptomyces
Abstract
Chemicals used for the management of crop diseases have been shown to be toxic to non-target organisms and may be toxic to humans. Much of modern research in plant pathology aims at finding other environmentally friendly means including use of bioagents for control of plant diseases. A number of bioagents including bacteria of the genera Pseudomonas, Bacillus, and Streptomyces are used for disease suppression. The mechanisms by which bioagents affect the pathogen populations are: (1) direct parasitism or lysis and death of the pathogen, (2) competition with the pathogen for food, (3) direct toxic effects on the pathogen by antibiotic substances released by the antagonist, and (4) indirect toxic effects on the pathogen by volatile substances, such as ethylene, released by the metabolic activities of the antagonist. The bacterial bioagents may be applied through various means like seed treatment, soil amendment, foliar spray etc. for management of crop diseases.
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Reference
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