Sources and spread of Myzus persicae Sulzer and cucumber mosaic virus on tobacco
1996
Agres, E.P. | Truong, L.R. | Obien, A.S. | Manzanas, M.E. | Bayangos, M.N.U.
The alternate hosts of the tobacco aphid, Myzus persicae Sulzer and cucumber mosaic virus and their spread on tobacco were studied for three tobacco seasons. A total of 21 aphid species visited tobacco plantations. Winged individuals of M. persicae Sulzer, Aphis gossypii Glover and A. craccivora Koch caught alive on a net trap were able to transmit CMV on tobacco. In addition, green house test using the same species including A. eugeniae van de Goot were able to transmit CMV from diseases to healthy tobacco. The tobacco aphid colonized seven plant species belonging to Solanaceae, Brassicae and Cruciferae families. CMV on the other hand, was positively transmitted from the three broadleaf weed species and one ornamental. The weed species, Chromolaena odorata L. (R.M. King and H. Robinson) was considered as the most numerous alternate host and source of CMV in tobacco plantations. CMV infestation in the monitored tobacco plantations ranged from 10 to 95 percent. The percentage of diseased tobacco plants followed a gradient where it is higher in areas adjacent to standing Chromolaena weeds and decreases as one moves away from the source. Incidence of CMV was likewise higher in plantations where there is a dense population of Chromolaena adjacent or surrounding the plantations
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