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Manonmani, K.
- Development of Integrated Biocontrol Strategy for the Management of Stem Rot Disease (Fusarium oxysporum F.sp. Vanillae) of Vanilla
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Authors
Affiliations
1 Horticultural Research Station, Krishi Vigyan Kendra, Pechiparai-629 161, IN
1 Horticultural Research Station, Krishi Vigyan Kendra, Pechiparai-629 161, IN
Source
Agricultural Science Digest, Vol 28, No 2 (2008), Pagination: 109-111Abstract
Stem rot disease of vanilla caused by Fusarium oxysporum f.sp. vanillae is a major constraint in its cultivation in Kanyakumari District. The in vitro studies on the mycelial growth of the pathogen expressed the superior efficacy of the native isolate of Pseudomonas fluorescens (PfNI) that recorded an inhibition zone of 25.00mm and was followed by T. harzianum. Under field conditions soil application of Pf(NI) followed by carbendazim spray (0.2%) after 30 days of Pseudomonas application recorded the lowest disease incidence of 3.77, 4.03 and 3.67 per cent in three years and exerted 79.95, 80.50, 80.48 per cent reduction in disease over the control plot respectively. Among the bioagents, the soil application of Pf(NI) followed T. harzianum after 30 days and another dose of Pf(NI) after 30 days recorded a significant disease reduction of 69.84, 68.24 and 70.21 per cent in three consecutive years.- Biochemical Changes in Acid Lime During Pathogenicity of Canker Pathogen
Abstract Views :115 |
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Authors
Affiliations
1 Krishi Vigyan Kendra, Pechiparai, Kanyakumari, IN
2 Agricultural College and Research Institute TNAU, Madurai-625 002, IN
1 Krishi Vigyan Kendra, Pechiparai, Kanyakumari, IN
2 Agricultural College and Research Institute TNAU, Madurai-625 002, IN
Source
Indian Journal of Agricultural Research, Vol 43, No 3 (2009), Pagination: 157-165Abstract
Studies were conducted to screen out the compatible host and pathogen combination with acid lime and canker causing pathogenic culture of Xanthomonas axonopodis Pv. Citri (Xac). Among the 21 isolates collected from acid lime cultivating areas of Tamil Nadu, isolate I3 was found to be the most virulent. This compatible combination was tested under controlled environment condition at 28°C and its effect on biochemical parameters of host metabolism was studied. The biochemical changes in the host during the course of pathogenicity include, slight increase in protein, phenol, phenyl alanine ammonia lyase (PAL), β-1, 3-glucanase and chitinase enzymes. Significant increase in the activities of peroxidase (POX), polyphenol oxidase (PPO) and catalase was observed in the infected tissues. Total and non-reducing sugars decreased, but reducing sugar content increased slightly.Keywords
Acid Lime, Pathogenicity, Xanthomonas axonopodis Pv. Citri, Biochemical Changes.- Identification of Active Principle in the Herbal Extracts Possessing Bactericidal Action against Citrus Canker, Xanthomonas axonopodis pv. Citri
Abstract Views :107 |
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Authors
Affiliations
1 Krishi Vigyan Kendra, Horticultural Research Station (TNAU), Pechiparai-629161, IN
1 Krishi Vigyan Kendra, Horticultural Research Station (TNAU), Pechiparai-629161, IN
Source
Indian Journal of Agricultural Research, Vol 43, No 2 (2009), Pagination: 129-133Abstract
Bactericidal action ofsome selected herbal extracts viz., Acalypha indica, Achyranthes aspera, Aloe vera, Azadirachta indica, Datura metal, Hibiscus rosasinensis, Nerium oleander, Ocimum sanctum, O. basilicum, Phyllanthus emblica, Polyalthia longifolia, Piper betle, Punica granatum, Solanum torvum and Solanum trilobatum were tested in vitro against the growth of citrus canker disease causing pathogen, Xanthomonas axonopodis pv. citri (Xac). The leaf extract of P. longifolia followed by A. aspera recorded the maximum growth inhibition of 9.77mm and 8.47mm diameter respectively. The 20-40% ammonium sulphate fraction of A. aspera and 40-60% fraction of P. longifolia exhibited inhibitory action on in vitro growth of the pathogen. The molecular weight of the fractions of leaf extracts was found to be 30 kDa and 19 kDa for P. longifolia and A. aspera respectively.Keywords
Herbal Extracts, Citrus Canker, Xanthomonas axonopodis pv. Citri.- Biocontrol Efficacy of Bacterial Antagonists in the Management of Sheath Rot Disease of Rice
Abstract Views :107 |
PDF Views:1
Authors
Affiliations
1 Krishi Vigyan Kendra, Pechiparai-629161, IN
1 Krishi Vigyan Kendra, Pechiparai-629161, IN
Source
Indian Journal of Agricultural Research, Vol 42, No 3 (2008), Pagination: 212-215Abstract
Rice is affected by number of fungal, bacterial and viral diseases. Among the fungal diseases, sheath rot caused by Sarocladium oryzae has been reported to cause considerable loss in yield. Bacterial biocontrol agents viz., Pseudomonas fluorescens (Pf1) and Bacillus subtilis have been formulated in different carriers viz., gypsum, peat soil and talc powder. Their longevity and biocontrol efficacy against sheath rot incidence were assessed under artificially inoculated condition. The results revealed that gypsum based formulation of two bioagents were effective in controlling the disease by recording the disease incidence of 10.67 per cent and 12.00 per cent respectively. Under field condition also, gypsum based formulation of these biocontrol agents were found to be more effective in controlling sheath rot incidence than the talc and peat based formulations.- Induced Systemic Resistance (ISR) in Plant Disease Management-A Review
Abstract Views :111 |
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Authors
Affiliations
1 Krishi Vigyan Kendra, Pechiparai-629 161, IN
2 Horticultural Research Station, Pechiparai, 629 161, IN
1 Krishi Vigyan Kendra, Pechiparai-629 161, IN
2 Horticultural Research Station, Pechiparai, 629 161, IN
Source
Agricultural Reviews, Vol 28, No 1 (2007), Pagination: 42-48Abstract
Disease management options currently available to farmers do not provide adequate control of plant diseases and there is a need for new disease management strategies. Induced systemic resistance (ISR) of plants against pathogens is a widespread phenomenon that has been intensively reviewed with respect to the underlying signalling pathways as well as to its potential use in plant protection. Systemic acquired resistance (SAR) is also vital plant defense system that confers broad spectrum resistance accompanied by coordinated expression of SAR genes. The present review focuses on international and indigenous research efforts in resistance induction in plants to the pathogen attack. It provides a perceptible review on the agents inducing systemic disease resistance and the mechanism underlying the induction of resistance. Recent trends in plant disease management in India cover the use of chemicals, plant extracts, cultural methods and the use of biological agents. Each and every agent possesses inherent ability to induce resistance mechanism of the host systemically. Such hidden efficacy can be potentially utilized for plant disease management.- Integration of Robust Design and Simulation to Predict Optimum Parameters for Laser Beam Welding
Abstract Views :39 |
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Authors
K. Manonmani
1,
N. Murugan
2
Affiliations
1 Govt. College of Technoloy, Coimbatore, IN
2 Coimbatore Institute of Technology, Coimbatore, IN
1 Govt. College of Technoloy, Coimbatore, IN
2 Coimbatore Institute of Technology, Coimbatore, IN