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Role of bacterial bioagents in plant disease management review

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Commercial biocontrol agents and their mechanism of action in the management of plant pathogens

Jan Mohd Junaid, Nisar Ahmad Dar, Tariq Ahmad Bhat, Arif Hussain Bhat, Mudasir Ahmad Bhat

International Journal of Modern Plant & Animal Sciences 1 (2), 39-57, 2013

Plant diseases are among the main constraints affecting the production and productivity of crops both in terms of quality and quantity. Use of chemicals continues to be the major tactic to mitigate the menace of crop diseases. However, because of the environmental concerns, health conscious attitude of human beings and other hazards associated with the use of chemicals, use of bio agents to suppress the disease causing activity of plant pathogens is gaining importance. The purposeful utilization of living organisms whether introduced or indigenous, other than the disease resistant host plants, to suppress the activities or populations of one or more plant pathogens is referred to as bio control. Biological control involves the use of beneficial organisms, their genes, and/or products, such as metabolites, that reduce the negative effects of plant pathogens and promote positive responses by the plant. In this direction, a number of commercial products have been registered both at national and inter-national levels based on different fungal and bacterial antagonists. These commercial products include, Biocon, Biogaurd, Ecofit, F-Stop, Soilgaurd etc with Tricoderma sp. as active ingredient, and Mycostop, Rhizoplus Subilex etc utilizing various Bacillus species as active ingredient. Biological control can achieve the objective of disease suppression through a number of ways such as antibiosis,

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Pseudomonas fluorescens, a potential bacterial antagonist to control plant diseases

Girija Ganeshan, A Manoj Kumar

Journal of Plant Interactions 1 (3), 123-134, 2005

Fluorescent Pseudomonads belong to plant Growth Promoting Rhizobacteria (PGPR), the important group of bacteria that play a major role in the plant growth promotion, induced systemic resistance, biological control of pathogens etc. Many strains of Pseudomonas fluorescens are known to enhance plant growth promotion and reduce severity of various diseases. The efficacy of bacterial antagonists in controlling fungal diseases was often better as alone, and sometimes in combination with fungicides. The present review refers to occurrence, distribution, mechanism, growth requirements of P. fluorescens and diseases controlled by the bacterial antagonist in different agricultural and horticultural crops were discussed. The literature in this review helps in future research programmes that aim to promote P. fluorescens as a potential bio-pesticide for augmentative biological control of many diseases of agriculture and horticultural importance.