Studies on black eye cowpea mosaic viral disease on cowpea (vigna unguiculata (l) walp)
KrishiKosh
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Title |
Studies on black eye cowpea mosaic viral disease on cowpea (vigna unguiculata (l) walp)
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Creator |
K.Shilpa Shree
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Contributor |
M.S.Patil
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Subject |
Plant Pathology
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Description |
Roving survey during Kharif 2005 for black eye cowpea mosaic viral disease showed an incidence to an extent of 10.00 to 36.00 per cent, where as during summer 2006 incidence ranged from 18.00 to 48.00 per cent. The BlCMV was readily transmitted by sap inoculation, the aphid Aphis craccivora Koch transmitted the virus non-persistently with transmission varied from 52.00 to 58.36 per cent and seed transmission of 18.00 to 51.00 per cent was noticed. Symptoms appeared first on cotyledonary leaves as mosaic mottling and leaf distortion followed by dark green vein banding on the succeeding trifoliate leaves. Electron microscopic studies from partially purified preparation of diseased samples showed the presence of flexuous filamentous particles. Total free phenols content was higher in BlCMV resistant genotype than in susceptible genotype. In the isozyme studies, infected leaves showed greater intensities of the isoperoxidase bands in comparision with extracts of the healthy leaf. The correlation studies of weather parameters with per cent disease incidence and aphid population revealed a significant. Positive correlation with temperature, negative nonsignificant correlation with relative humidity and significant negative correlation with rainfall. Highly significant positive correlation was obtained between per cent disease incidence and aphid population. Studies on integrated disease management of BlCMV showed the practice of imidacloprid seed treatment followed by one spray of dimethoate at 30 days and another spray of nimbicidine at 45 days recorded the least number of vector population with reduced per cent disease incidence. Among 21 genotypes screened during Kharif 2005, farmer seed, EC-29805, IC-97767 IC-202797 were resistant, GC3 was highly susceptible. Among 25 genotypes screened during rabi-summer, 2006, DCS-6 genotype found resistant, V-118, C-152 were highly susceptible to the disease. |
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Date |
2016-10-24T19:05:58Z
2016-10-24T19:05:58Z 2006 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/81660
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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