STUDIES ON LEAF CURL DISEASE OF TOBACCO, NICOTIANA TABACUM L.
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Date
1988
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AAU, Anand
Abstract
Investigations on host range, persistence of tobacco leaf curl virus (TLCV) by its vector whitefly, Bemisia tabaci Gennadius and the ability of the vector to carry TLCV and yellow-vein mosaic virus of okra simultaneously revealed that 29 out of 99 plant species belonging to 24 families were susceptible to TLCV infection when inoculated artificially through the 'vector whitefly under glasshouse conditions. Out of these, the transmission of leaf curl to five plant species, viz., Amaranthus lividus, Launaea sermentosa, Cichorium intybus, Lepidium sativum and Fagopyrum esculentum is reported for the first time. In addition to these hosts, Vinca rosea was also found to exhibit leaf curl symptoms when inoculated artificially through whitefly. Female whitefly adults when given feeding periods of 30 min, 2, 4 and 6 h on the infection source retained the infectivity upto 2, 4, 7 and 8 days, respectively after serial transfers on healthy tobacco plants. Female whiteflies retained the infectivity for a minimum of 10 days when the acquisition feeding period was prolonged to 24 h. The vector whitefly was found to transmit TLCV and yellow-vein mosaic virus of okra simultaneously to the respective hosts from which they were acquired by the vector indicating that the vector whitefly is capable of harbouring both the viruses at the same time.
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Plant Pathology, Agriculture, A Study