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311-338. Academic Press, New York. Harris, K. , and Bradley, R. H. E. (1973a). Importance of leaf hairs in the transmission of tobacco mosaic virus by aphids. Virology 52: 295-300. Harris, K. , and Bradley, R. H. E. (1973b). Tobacco mosaic virus: can aphids inoculate it into plants with their mouthparts? Phytopathology 63: 1343-1345. Hughes, W. , and Lister, C. A. (1953). /. Hort. Sci. 28: 131. Igwegbe, E. C. K. (1966a). The preferences shown by Planococcoides njalensis (Laing) and Ferrisiano virgata ( C k l l ) for different feeding sites and its effect on their efficiency as vectors.

Transmission of tobacco mosaic by citrus mealybug. PI. Prot. Bull. F. A. O. 2: 40. Okusanya, B. A. M. (1969). Cocoa swollen shoot virus. Ann. Rep. Cocoa Res. Inst. Nigeria 1967-68, pp. 88-92. Okusanya, B. A. M. (1970). Transmission of CSSV. Ann. Rep. Cocoa Res. Inst. Nigeria 196869,55-56. Olitsky, P. K. (1925). The transfer of tobacco and tomato mosaic diseases by Pseudococcus citri. Science 62: 442. Orlob, G. B. (1963). Reappraisal of transmission of tobacco mosaic virus by insects. Phytopathology 53: 822-830.

Many reviews have been published on whitefly transmitted diseases (Bird and Maramorosch, 1978; Costa, 1969, 1976; Orlando and Silberschmidt, 1946; Varma, 1962). More than 70 diseases have been reported on cultivated and weed plants. Most of the reports are based on symptomatology and transmission. The nature of the causal agent is known in only a few instances. Some of these diseases might have been caused by the same or related strains of the same agent. Costa (1976) grouped whitefly transmitted dieseases into (a) mosaic, (b) leaf curl, and (c) yellowing types.

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