1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

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Subject: search.filters.subject.Graft transmission

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    Diversity of begomoviruses infecting major vegetable crops
    (Department of Plant Pathology, College of Agriculture, Vellayani, 2019) Bincy S Basheer; Umamaheswaran, K
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    Studies on leaf curl disease of sesamum
    (Department of Plant Pathology, College of Agriculture, Vellayani, 1984) Jayasree, M; Balakrishnan, S
    Leaf curl disease of sesamum, its symptomatology, mode of transmission, vector-virus relationships, the pattern of spread under field conditions and the extent of loss caused by the disease were investigated. Major symptoms of the disease were abaxial curling of the leaves, thickening of the veins on the under surface of the leaves, leathery appearance of the leaves and reduction in the size of leaf lamina. The plants remained stunted and produced few flowers and pods when infection occurred during the early stages of the plant growth. When infection occurred during later stages there was production of flowers and pods hut to a limited extent. This particular virus could he transmitted by wedge and side grafting and by the whitefly Bemisia tabaci Genn. The minimum, acquisition feeding period was found to be 10 min and the minimum inoculation feeding period was 20 min. The vector required an incubation period of 28 h to become viruliferous. Even a single whitefly was found to be capable of transmitting the virus. Once the vector acquired the virus it would retain it till its death. Negative results were obtained in the case of sap and seed transmission showing that this particular virus was not sap and seed transmissible.
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    Transmission, physical properties and host range of brinjal mosaic virus
    (Department of Plant Pathology, College of Agriculture, Vellayani, 1996) Surendran, M; Rajagopalan, B
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    Properties, Hostrange and control of cowpea mosaic virus
    (Department of Plant Pathology, College of Agriculture, Vellayani, 1987) Sreelakha, L
    Studies were conducted on the cowpea mosaic virus disease commonly occurring in cowpea plants (Viena unguiculata (L.) Walp in Kerala. The major symptoms caused by cowpea mosaic virus infection in cowpea plants wars vein banding, inter- voinai cnlorosis, mosaic mottling and general stunting of the plants. Transmission studies showed that the virus could he transmitted through mechanical means, grafting,through seeds and by means of aphid vectors. The virus was found to be transmitted by the aphids, Aphis eracclvora. Aphis gossypil and Aphis rnalvae. Among the three species of aphids, Aphis craecivora was found to be the most efficient vector. The percentages of transmission obtained by A . craecivora, A. gossypii and A. malvae were 90,65 and 43 respectively.