Management of Collar Rot of Groundnut (Arachis hypogaea L.) caused by Aspergillus niger van Teighem
KrishiKosh
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Title |
Management of Collar Rot of Groundnut (Arachis hypogaea L.) caused by Aspergillus niger van Teighem
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Creator |
Rohtas
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Contributor |
Saharan, Hawa Singh
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Subject |
diseases, sowing, niger, groundnuts, fungi, planting, application methods, biological development, developmental stages, biological phenomena
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Description |
The collar rot disease caused by Aspergillus niger van Teighem is most serious soil and seed borne fungal disease which causes maximum damage in groundnut (Arachis hypogaea L.). The present investigation was undertaken to study the effect of A. niger on seed germination and seedling vigour of groundnut genotypes and to manage the disease through host resistance, fungicides, bio-agents and botanicals. The pathogen significantly reduced the per cent germination, plumule and radicle length, fresh and dry weight of seedlings and cumulative reduction in seedling vigour index in all the four genotypes under both seed and soil inoculation technique. Out of one hundred twenty germplasm lines screened for their relative resistance against collar rot disease in field under natural sick plot conditions, none of the lines showed resistant reaction, however, five lines showed moderately resistant, eighty seven lines showed moderately susceptible reaction, twenty two lines showed susceptible reaction, while six germlasm lines showed highly susceptible reaction against collar rot disease. Efficacy of pesticides in vitro against A. niger showed that propiconazole, carbendazim and carboxin completely inhibited the mycelial growth up to 100 per cent at 200, 500 and 1000 ppm concentration, respectively. Captan and thiram were found very less effective as they inhibited 81.11 and 72.77 per cent of fungal growth, respectively at higher concentration of 1000 ppm. Fungicide hexaconazole, herbicide pendimethalin and insecticide chlorpyriphos were failed to show antifungal activity against A. niger even at 1000 ppm concentration. Evaluation of bio-agents against A. niger in vitro revealed that Trichoderma viride showed maximum antifungal activity with 78.32 per cent inhibition of mycelial growth followed by T. harzianum (72.50%) inhibition of mycelial growth and Pseudomonas fluroscence (23.80%) inhibition of mycelial growth. Seed treatments with fungicides and soil inoculation with bio-agents significantly reduced the disease incidence of collar rot due to A. niger. Maximum collar rot disease control was found by propiconazole @ 1ml/kg seed which controlled 87.50 per cent followed by carbendazim @ 2g/kg seed (75.00%) and captan @ 3g/ kg seed (68.76%), by seed treatment under screen house conditions in pots. In case of bio-agents, T. viride showed maximum disease control (43.75%) followed by T. harzianum (31.25%) as comparison to control. Among the botanicals, neem cake powder @ 20g/kg soil showed maximum control of disease (32.53%) followed by mustard cake powder @ 20g/kg soil (23.97%) in comparison to control. |
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Date |
2016-02-10T12:18:58Z
2016-02-10T12:18:58Z 2014 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/64276
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Language |
en
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Format |
application/pdf
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Publisher |
CCSHAU
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