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Dutta, B. K.
- In vitro Pathogenicity of Bacillus thuringiensis against Tea Termites
Abstract Views :382 |
PDF Views:128
Authors
Affiliations
1 Department of Ecology & Environmental Sciences, Assam University, Silchar 788 011, Assam, IN
2 Department of Zoology, G. C. College, Silchar 788 004, Assam, IN
1 Department of Ecology & Environmental Sciences, Assam University, Silchar 788 011, Assam, IN
2 Department of Zoology, G. C. College, Silchar 788 004, Assam, IN
Source
Journal of Biological Control, Vol 24, No 3 (2010), Pagination: 279-281Abstract
Tea is an economically important plantation crop of Assam, India. Termites are one of the predominant pests causing damage to tea, thereby affecting the productivity and quality. Bacillus thuringiensis strains are widely used as microbial control agents for different insect pests. In the present study B. thuringiensis and B. thuringiensis subsp. israelensis were evaluated in vitro for their pathogenicity against two species of tea termites, viz., Microtermes obesi Holmgren and Microcerotermes beesoni Snyder. Bacillus thuringiensis strains caused mortality of above 80% in both the termite species. B. thuringiensis subsp. israelensis was found to be more virulent compared to B. thuringiensis against the termites.Keywords
Microcerotermes beesoni, Microtermes obesi, Median Lethal Time.Full Text
- Control of Black Rot Disease of Tea, Camellia sinensis (L.) O. Kuntze with Mycoflora Isolated from Tea Environment and Phyllosphere
Abstract Views :332 |
PDF Views:131
Authors
Affiliations
1 Microbial and Agricultural Ecology and Biodiversity Conservation Laboratory, Department of Ecology and Environmental Sciences, Assam University, Silchar 788 011, Assam, IN
1 Microbial and Agricultural Ecology and Biodiversity Conservation Laboratory, Department of Ecology and Environmental Sciences, Assam University, Silchar 788 011, Assam, IN
Source
Journal of Biological Control, Vol 26, No 4 (2012), Pagination: 341– 346Abstract
The potential of some aeromycoflora and the tea phyllosphere micro organisms to control black rot disease of tea (causal organism - Corticium theae Bernard) was evaluated. Fungal microorganisms isolated from the tea plantation environment and phyllosphere of 11 clones of tea were evaluated. The fungal genera most frequently trapped from the environment of tea plantation were Aspergillus flavus, Aspergillus niger, Curvularia sp., Penicillium sp. and Trichoderma atroviride. The most frequently recovered mycoflora from the tea phyllosphere are Aspergillus flavus, Aspergillus niger, Penicillium sp., Trichoderma atroviride and Trichoderma citrinoviride. Experiment was carried out to assess the possible use of these micro organisms as biocontrol agents against the black rot disease of tea causing organism i.e. Corticium theae under in vitro and field conditions. The aqueous solution of the antagonists which showed maximum inhibition of the pathogen in vitro was applied under field conditions as foliar spray. The percentage symptom and senility index was found to be lowest in the plots sprayed with A. niger followed by T. atroviride and T. citrinoviride, respectively.Keywords
Aeromycoflora, Antagonists, Corticium theae, Phyllosphere.Full Text
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