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Studies on black eye cowpea mosaic viral disease on cowpea (vigna unguiculata (l) walp)

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Title Studies on black eye cowpea mosaic viral disease on cowpea (vigna unguiculata (l) walp)
 
Creator K.Shilpa Shree
 
Contributor M.S.Patil
 
Subject Plant Pathology
 
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.
 
Date 2016-10-24T19:05:58Z
2016-10-24T19:05:58Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81660
 
Format application/pdf
 
Publisher UAS, Dharwad