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Subject: Entomology × Author: Mondal, Shaonpius × End date: 2009 × Start date: 2000 × Type: Thesis × Thesis Type: M.Sc ×
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    Studies on the virus-vector relationship of Cowpea Golden Mosaic Virus and its vector, Bemisia tabaci (Gennadius) on cowpea
    (Punjab Agricultural University, Ludhiana, 2008) Mondal, Shaonpius; Gill, C.K.
    Cowpea Golden Mosaic Virus was not mechanically as well as seed transmissible. The virus infection reduced the seed germination by 31.25 % in Cowpea-263 and 76.19% in Cowpea-88 in comparison to the healthy seeds of the cultivars. The size of the seed and the pod formation was severely affected by the virus. The Acquisition threshold period and the inoculation threshold period of the virus was 15 min and 20 min respectively. There was a positive co-relation between acquisition access and the inoculation access periods with the per cent virus transmission. A single whitefly was capable to transmit the virus but the increase in number up to 15 whiteflies per plant resulted in maximum transmission of the virus. Female whiteflies were more efficient vector (70 %) in transmission of CpGMV in comparison to the males (45%). The virus had limited host range mostly confined to cowpea. It was not transmissible to important crops of the families Solanaceae, Leguminaceae and Malvaceae. The weather parameters affected the whitefly population. There was a positive co-relation between the whitefly population and the virus incidence. Cowpea cultivar Cowpea-88 was relatively more susceptible to CpGMV (41%) where as cowpea 263 had minimum virus infection (9.96%). Cowpea germplasms i.e. AC-7, IC-5, IC-8, IC-9, IC-11 had no virus infection and seemed to be promising for their use in the future breeding programms.