Effet des mouches blanches (bemisia tabaci genn.) Sur la progression et la severite de la maladie de la mosaïque du manioc (manihot esculenta crantz) dans les champs de production au Togo

A study was was carried out in order to contribute in the search of strategy of controlling Bemisia tabaci (Gennadius) devastator and responsible of the propagation and symptom severity Cassava mosaic disease (CMD) in cassava fields in Togo. In fact, it is the two combined actions of the whiteflies (B tabaci), waste on the development of cassava plants and transmission of Begomovirus that represent the major problem in cassava production zones in Togo. To achieve this objective, two insecticides, one acting by contact, Dursban (Chlorpirifos-Ethyl) and the other, systemic, Diméthoate were used with specific treatments at two sites (Bagbe and Davié-Tekpo). Results of the observations made during this study, revealed that the symptom severity of CMD on cassava plant in the plots is related to the initial state of the material of plantation employed and theactivity of the whiteflies within the plots and reveal that a judicious control of the whiteflies would allow to maintain the level of CMD severity very low in cassava fields