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Muthamilan, M.
- Biological Control of Cowpea [Vigna unguiculata (L.) Walp.] Root-Rot Caused by Macrophomina phaseolina (Tassi.) Goid. by Bacterial and Fungal Antagonists
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Authors
Affiliations
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 21, No 1 (2007), Pagination: 111-118Abstract
Seven bacterial isolates (four of Psendomonas fluorescens and three of Bacillus subtilis) and seven isolates of fungal antagonists (six of Trichoderma spp, and one of Lentinns spp.) were tested for their ability to inhibit cowpea ischolar_main-rot pathogen, Macrophomina phaseolina under both in vitro and in vivo conditions. Among the bacterial antagonists, P. fluorescens charvae isolate recorded a maximum inhibition of mycelial growth of the pathogen followed by P. fluorescens isolate 2, whereas in fungal antagonists, T. koningii recorded a maximum inhibition followed by L. edodes and T. viride isolate 4. Pot-culture evaluation, under greenhouse conditions using P. fluorescens cliarvae, T. koningii and L. edodes revealed talc based powder formulation of P. fluorescens cliarvae and T. koningii was found to be the best in controlling ischolar_main-rot incidence of cowpea.Keywords
Bacillus subtilis, Biological Control, Cowpea, Pseudomonas fluorescens, Trichoderma spp.Full Text
- Effect of Antagonistic Fungi on Sclerotium rolfsii Causing Root Rot of Groundnut
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PDF Views:115
Authors
Affiliations
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN
Source
Journal of Biological Control, Vol 6, No 2 (1992), Pagination: 88-92Abstract
In vitro studies showed that 67.4 percent reduction of sclerotlal production in Sclerotium rolfsii was observed in the presence of Trichoderma viride Pers. (isolate 2). Mature sclerotia from each dual culture plate measured 647, 777, and 763 μm with T. viride (isolate 3), T. harzianum Rifai (isolate2) and Laetisaria aravalis Burdusall respectively. In slide germination test, 68.3 and 56.7 percent reduction of sclerotial germination was observed with T. viride (isolate 3) and T. harzianum (Isolate 2), respectively; whereas when plated in solid media, it was 47.5 percent with T. viride (isolate 3). The number of hyphae put forth by each sclerotium was found to be minimum in sclerotia produced in dual culture with T. viride (isolates 2 and 3).Keywords
Trichoderma viride, T. harzianum, Laetisaria arvalis, Dual Culture, Incubation, Germination.Full Text
- Prevalence, Symptomatology, Pathogenicity and Nutritional Requirements of Fusarium oxysporum f.sp.phaseoli Causing Fusarium Yellows of French Bean in Thandikudi
Abstract Views :271 |
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Authors
Affiliations
1 Department of Plant Pathology, Agricultural College and Research Institute, Madurai (T.N.), IN
2 Department of Horticulture, Agricultural College and Research Institute, Madurai (T.N.), IN
1 Department of Plant Pathology, Agricultural College and Research Institute, Madurai (T.N.), IN
2 Department of Horticulture, Agricultural College and Research Institute, Madurai (T.N.), IN
Source
International Journal of Plant Sciences, Vol 11, No 2 (2016), Pagination: 161-166Abstract
Fusarium yellows/wilt caused by Fusarium oxysporum f.sp.phaseoli are one of the serious diseases in French bean in Thandikudi and Kodaikanal hills of Dindugal district was found to prevalent in all French beans growing areas under survey with maximum of 71.25 per cent incidence and 65.88 per cent disease severity at Thandikudi village of Dindugal district in Tamil Nadu. The pathogenicity test was conducted by artificial inoculation of test fungus into the young two leaf stage of French bean and the typical symptom were produced after twelve days after inoculation. Among the different solid and liquid media tested oat meal agar potato dextrose agar medium supported growth of the casual fungus. Fungus could grow well at a pH 4.0 and 5.0, respectively. This pathogenic fungus grew maximum when basal medium was supplemented with lactose and dextrose as carbon sources showed maximum growth and with potassium nitrate and sodium nitrate as nitrogen sources.Keywords
Fusarium oxysporum f.sp.phaseoli, Pathogenecity, Thandikudi, Symptoms.
References
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- Screening of M3 Mutants for Yellow Vein Mosaic Virus Resistance in Greengram [Vigna radiata (L.) Wilczek]
Abstract Views :318 |
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Authors
Affiliations
1 Department of Plant Breeding and Genetics, Agricultural College and Research Institute (T.N.A.U.), Madurai (T.N.), IN
2 Department of Plant Pathology, Agricultural College and Research Institute (T.N.A.U.), Madurai (T.N.), IN
1 Department of Plant Breeding and Genetics, Agricultural College and Research Institute (T.N.A.U.), Madurai (T.N.), IN
2 Department of Plant Pathology, Agricultural College and Research Institute (T.N.A.U.), Madurai (T.N.), IN
Source
International Journal of Plant Sciences, Vol 11, No 2 (2016), Pagination: 265-269Abstract
Greengram [Vigna radiata (L.) Wilczek] is a cheap source of dietary protein for the poor, with high levels of folate and iron compared with many other legumes. Mungbean yellow mosaic virus is also one of the destructive viral disease affecting yield potential of greengram both quantitatively and qualitatively. Induced mutations, have offered a single and short alternative to conventional breeding including isolation, screening, selection and testing generation after generation. An investigation was carried out in two mungbean genotypes viz., CO (Gg) 7 and NM 65 treated by two mutagens viz., gamma rays at the doses of 300, 400 and 500 Gy and EMS treatments of 10, 20 and 30 mM. The trial was conducted in the research farm of Agricultural College and Research Institute, TNAU, Madurai during Kharif season 2013. The M2 generation was raised as individual M1 plant basis. The treated and control populations of M2 generation were carefully screened for pod shattering resistance. The yellow vein mosaic virus disease (YMV) incidence was recorded for all the plants in M3 generation for the selected 22 mutants. Based on field scoring, the mutants viz., M5, M18, M26, M46, M54, M58, M70, M71, M92 and M98 were identified as yellow vein mosaic virus resistant mutants. The mutants which showed field resistance were checked for YMV resistant gene using the gene specific primer ISSR811. Five mutants confirmed with marker studies. These resistant mutants have been forwarded to next generation for further yield performance.Keywords
Mungbean, Induced Mutation, Yellow Vein Mosaic Virus, Scoring, Mutants, Marker.References
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- Dhole, V.J. and Reddy, K. (2013). Development of a SCAR marker linked with a MYMV resistance gene in mungbean [Vigna radiata (L.) Wilczek]. Plant Breed., 132 : 127-132.
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- Studies on Shelf-Life of Streptomyces spp. in Different Carrier Materials
Abstract Views :328 |
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Authors
Affiliations
1 Department of Plant Pathology, Tapioca and Castor Research Station (T.N.A.U.), Yethapur (T.N.), IN
2 Department of Plant Pathology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai (T.N.), IN
1 Department of Plant Pathology, Tapioca and Castor Research Station (T.N.A.U.), Yethapur (T.N.), IN
2 Department of Plant Pathology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai (T.N.), IN
Source
International Journal of Processing and Post harvest Technology, Vol 7, No 1 (2016), Pagination: 16-20Abstract
Inoculation of bioinoculants in crop cultivation is performing vital role in sustainable agriculture. It is well known that the carrier-based bioinoculants are being very effective as carrier determines the shelf-life of the inoculant. Hence, the selection of superior carrier is very crucial for maintaining shelf-life of the inoculant for the periods of storage and for better performance in the field use. In the present study, the population of Streptomyces violaceusniger was assessed at ten days interval in different carrier materials. The population of S. violaceusniger and Streptomyces exfoliates were observed at the end of 30 d. In addition, the talc based formulation was found to be highly suitable carrier to deliver both S. violaceusniger and S. exfoliatus. The results clearly revealed that the cell densities of S. violaceusniger and S. exfoliatus were high in the nutrient medium supplemented with glycerol when compared to nutrient broth alone.Keywords
Shelf-Life, Streptomyces spp.References
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