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Bora, L. C.
- Eco-Friendly Management of Soil Borne Diseases in Brinjal Through Application of Antagonistic Microbial Population
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Authors
Affiliations
1 Krishi Vigyan Kendra, Sonitpur, Assam, IN
2 Department of Plant Pathology, Assam Agricultural University, Jorhat 785 013, IN
1 Krishi Vigyan Kendra, Sonitpur, Assam, IN
2 Department of Plant Pathology, Assam Agricultural University, Jorhat 785 013, IN
Source
Journal of Biological Control, Vol 27, No 1 (2013), Pagination: 29-34Abstract
In Assam, bacterial wilt, a soil borne disease caused by Ralstonia solanacearum Yabuchi et al. is the major constraint for production of solanaceous vegetables. Present study was made to evaluate the efficacy of substrate based bioformulation of a PGPR, Pseudomonas fluorescens against the bacterial pathogen in brinjal (Solananum melengona) under field condition. Inhibitory activity of P. fluorescens was tested against R. solanacearum following dual culture method. Three substrates, viz., vermicompost (VC), mustard oil cake (MOC) and farm yard manure (FYM) were compared for mass multiplication of the antagonist. The highest population was recorded (105.56 x 108 cfu/g) when mass cultured in VC along with a standard sticker CMC and an osmoticant mannitol. Quantitative assay of population of P. fluorescens revealed that it could maintain high population count up to 180 days of storage at room temperature. Different method of application of the substrate based bioformulations viz., seed treatment (ST), ischolar_main application (RA), soil application at transplanting (SA) and soil application at 30 days after transplanting (30 DAP) and combined application of all the methods showed minimum wilt incidence and maximum disease reduction in brinjal. Minimum wilt incidence (0.25%) was recorded in the treatment comprising combination of ST, RA, SA and 30 DAP with maximum disease reduction. Following the trend of reduction in disease incidence, yield was maximum (34.40 t/ha) in this treatment and also showed the highest recovery of P. fluorescens strain-Pf-D1 in the soil rhizosphere after harvest (77.40 x 108 cfu/g). Vermicompost appeared to be the best nutrient source to support the antagonist for maximum multiplication and disease reduction and combined application of ST, RA, SA, 30 DAP was most effective bacterial wilt disease management in brinjal.Keywords
Antagonist, Bacterial Wilt, Brinjal, Microorganism, Organic Substrate, Pseudomonas fluorescens.References
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- Vidhyasekaran P, Muthamilan M. 1995. Development of formulations of P. fluorescens for control of chickpea wilt. Plant Dis. 79: 782–786.
- Efficacy of Substrate Based Bioformulation of Microbial Antagonists in the Management of Bacterial Disease of some Solanaceous Vegetables in Assam
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PDF Views:143
Authors
Affiliations
1 Krishi Vigyan Kendra, Assam Agricultural University, Sonitpur, Assam, IN
2 Department of Plant Pathology, Assam Agricultural University (AAU), Jorhat – 13, IN
1 Krishi Vigyan Kendra, Assam Agricultural University, Sonitpur, Assam, IN
2 Department of Plant Pathology, Assam Agricultural University (AAU), Jorhat – 13, IN
Source
Journal of Biological Control, Vol 30, No 1 (2016), Pagination: 49-54Abstract
A study was undertaken to explore effective organic substrate-based bioformulation using virulent cells of antagonists Pseudomonas fluorescens, Bacillus subtilis and Trichoderma viride during 2010-13. Three organic substrates, viz. vermicompost, farm yard manure and mustard oil cake (MOC) were compared for mass multiplication of the antagonists. All the substrate based antagonists showed effective results in suppression of bacterial wilt (Ralstonia solanacearum Yabuchi et al.) incidence in vegetable crops tomato, brinjal and chill. Quantitative aspect of population dynamics of the antagonists at different days of storage was made to evaluate the shelflife of the biopesticide and found that the antagonists maintained a steady population count upto 180 days of storage at room temperature. The combination of vermicompost P. fluorescens, carboxy methyl cellulose (CMC) and mannitol showed best shelf-life as it maintained highest population recovery of P. fluorescens and B. subtillis at different days of storage. The combination of MOC, T. viride, CMC and mannitol showed best shelf-life in case of T. viride and maintained highest population recovery of the antagonist at different days of storage. Application of the substrate based bioformulations as combination of seed treatment, ischolar_main application, soil application at transplanting and soil application at 30 days after transplanting showed minimum wilt incidence and maximum yield in tomato, brinjal and chilli. Maximum disease reduction (81.85%) was shown by bioformulation comprising P. fluorescens with vermicompost as substrate followed by T. viride with MOC as substrate (79.07%). Following the trend of reduction in disease incidence, yield was maximum in tomato (36.0 t/ ha), when the crop was treated with vermicompost based P. fluorescens followed by treatment with MOC based T. viride (33.35 t/ha). Yield of brinjal (27.60 t/ha) and chilli (26.30 t/ha) was similarly maximum when bioformulation of vermicompost based P. fluorescens was applied.Keywords
Antagonists, Bioformulation, Chilli, Tomato, Wilt.References
- Alexander M. 1997. Introduction to soil microbiology. John Wiley and Sons, New York. 212 pp.
- Anuratha CS, Gnanamanickam SS. 1990. Biological control of bacterial wilt caused by Pseudomonas solanacearum in India with antagonistic bacteria. Plant Soil 124: 109–116.
- Aspiras RB, Dela Cruz AR. 1985. Potential biological control of bacterial wilt in tomato and potato with Bacillus polymyxa Fu 6 and Pseudomonas fluorescens. pp. 89–92. In: Persely GD. (Ed.). Bacterial wilt disease in Asia and the South Pacific. ACIAR Proceedings, No. 13.
- Bora LC. 2008. Use of Pseudomonas fluorescens as bioformulation for management of wilt disease caused by Ralstonia solanacearum. Tropic Agric. 85(2): 57–61.
- Bora LC, Popy B. 2008. Biological control strategies for management of bacterial wilt of brinjal (Solanum melongena L.). J Mycol Pl Pathol. 38(3): 542–545.
- Bora LC, Deka SN. 2007. Wilt disease suppression and yield enhancement in tomato by application of Pseudomonas fluorescens - based bioformulation ‘Biofor-Pf’ in Assam. Indian J Agric Sci. 77(8): 490– 494.
- Bora LC, Das M, Das BC. 2000. Influence of microbial antagonists and soil amendments on bacterial wilt severity and yield of tomato (Lycopersicon esculentum). Indian J Agric Sci. 70(6): 390–392.
- Bull CT. 1987. Wheat ischolar_main colonization by disease suppressive bacteria and the effect of population size on severity of take-all caused by Gaeumannomyces graminis var. tritici. M.S. thesis Fleming West State Univ. Pullman. 75–81 pp.
- Burr TJ, Schroth MN, Suslow T. 1978. Increased potato yields by treatment of potato seed pieces with specific strains of Pseudomonas fluorescens and P. putida. Phytopathol. 68: 1377–1388.
- Chellemi DO, Olson SM, Scott JW. 1994. Field evaluation of tomato genotypes for resistance to bacterial wilt. Proc Flo State Hort Soc. 107: 151–153.
- Danielson RM, Davey CB. 1973. Non-nutritional factors affecting the growth of Trichoderma in culture. Soil Biol Biochem. 5: 495–504.
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- Efficacy of Pseudomonas fluorescens and Trichoderma viride Based Bioformulation for Management of Bacterial Wilt Disease of Ginger
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Authors
Popy Bora
1,
L. C. Bora
2,
P. C. Deka
1,
Bikram Borkotoki
3,
A. K. Sharma
1,
H. S. Dutta
1,
Debahaj Buhagohain
1
Affiliations
1 Krishi Vigyan Kendra, Sonitpur (Assam), IN
2 Department of Plant Pathology, Assam Agricultural University, Jorhat (ASSAM), IN
3 Regional Research Station (A.A.U.), North Lakhimpura (Assam), IN
1 Krishi Vigyan Kendra, Sonitpur (Assam), IN
2 Department of Plant Pathology, Assam Agricultural University, Jorhat (ASSAM), IN
3 Regional Research Station (A.A.U.), North Lakhimpura (Assam), IN
Source
International Journal of Plant Sciences, Vol 11, No 2 (2016), Pagination: 180-186Abstract
An experiment was conducted to evaluate the efficacy of a consortia formulation of Pseudomonas fluorescens and Trichoderma harzianum for management of bacterial wilt disease of ginger in Assam. Inhibitory effect of the biocontrol agents was evaluated in vitro following dual culture assay method for their efficacy against Ralstonia solanacearum, the ginger wilt pathogen. Quantitative assay of population dynamics of the two antagonists, mass cultured in organic substrates viz., vermicompost (VC) and mustard oil cake (MOC) revealed that the antagonists maintained a high population count up to 120 days of storage at room temperature. Pseudomonas fluorescens recorded highest average population (45.47 x 107cfu/g) when mass cultured in the mixture of VC and MOC, while T. harzianum recorded maximum average population (34.14 x 107cfu/g) when mass cultured in MOC. Bioformulations were further evaluated for their efficacy in ginger wilt management under field condition. Efficacy of one fungicide (Copper oxychloride) and an antibiotic (Streptocycline) was also tested for comparison. Lowest disease incidence (15.63%) was recorded in the treatment of seed treatment (ST) and soil application (SA) of P. fluorescens and T. harzianum consortia mass cultured in the mixture of VC and MOC. It was followed by ST and SA of T. harzianum mass cultured in MOC (21.88%), which was statistically at par with the application of copper oxychloride (26.25%).Keywords
Antagonists, Bacterial Wilt, Biological Management, Ginger, Substrates.References
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- Bora, L.C. and Bora, Popy (2008). Biological control strategies for management of bacterial wilt of brinjal (Solanum melongena L.). J. Mycol. Pl. Pathol., 38(3) : 542-545.
- Bora, L.C., Das, Minku and Das, B.C. (2000). Influence of microbial antagonists and soil amendments on bacterial wilt severity and yield of tomato. (Lycopersicon esculentum). Indian J. Agric. Sci., 70(6) : 390-392.
- Bora, Popy, Bora, L.C., Deka, P.C. and Begum, M.(2013). Ecofriendly management of bacterial wilt disease in brinjal through application of antagonistic microbial population. J. Biolog. Control, 27(1) : 29-34.
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- Morphological and Pathogenic Variability in French Bean Isolates of Sclerotinia sclerotiorum
Abstract Views :244 |
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Authors
Affiliations
1 Department of Plant Pathology, College of Agriculture, Assam Agricultural University, Jorhat (Assam), IN
2 Regional Agricultural Research Station, Titabor, Jorhat (Assam), IN
1 Department of Plant Pathology, College of Agriculture, Assam Agricultural University, Jorhat (Assam), IN
2 Regional Agricultural Research Station, Titabor, Jorhat (Assam), IN
Source
International Journal of Plant Sciences, Vol 11, No 2 (2016), Pagination: 340-344Abstract
Studies conducted on morphological and pathogenic variability among 30 isolates of Sclerotinia sclerotiorum (Lib) de Bary, derived from infected French bean (Phaseolus vulgaris) plants showing typical symptoms of white mold, collected from different geographical locations of NE India. All the isolates showed variation in morphological characters based on their mycelial growth, colony character and sclerotial formations when grown on PDA. Out of 30 isolates, 14 isolates showed highly virulent reaction, each 8 isolate revealed moderately and less virulent reaction respectively on French bean under pot condition.Keywords
Sclerotinia sclerotiorum, Phaseolus vulgaris, White Mold, PDA, Virulent.References
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