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Pour contribuer a la lutte contre la maladie de l’enroulement jaunissant des feuilles de la tomate, un programme de recherche a ete initie en Cote d’Ivoire. L’influence des parametres climatiques sur l’evolution des populations du vecteur de cette maladie virale, la mouche blanche (Bemisia tabaci Genn.) a ete evaluee a la Station de Recherche sur les Cultures Vivrieres du Centre National de Recherche Agronomique a Bouake a travers six differentes dates de semis de decembre 2000 a fevrier 2002. Cinq varietes de tomate dont un temoin local ont ete testees selon un dispositif en blocs de Fisher repete quatre fois. L’analyse de variance, l’analyse en composantes principales, la correlation lineaire de Pearson et la regression lineaire ont permis d’analyser les donnees collectees. Les resultats ont montre une significative influence des trois parametres climatiques sur les populations de l’insecte. Le modele lineaire double constitue du couple temperature moyenne et pluviometrie et du nombre d’adultes et de larves, a ete celui qui a mieux decrit les fluctuations des adultes et des larves. Ce modele a en effet explique 35,80% des fluctuations des populations adultes et 43,20% de celles des larves montrant ainsi l’influence du climat sur l’insecte. Mots cles : Mouche blanche, tomate, variete, date de semis, enroulement jaunissant des feuilles, Cote d’Ivoire. English Title: Influence of some climatic parameters on the numbers of Bemisia tabaci on tomato ( Solanum lycopersicum L. ) To contribute to the fight against the Tomato yellow leaf curl disease of tomato, a research program has been initiated in Cote d’Ivoire. The  influence of climatic parameters on the evolution of populations of the vector of this viral disease, the whitefly ( Bemisia tabaci Genn. ) was  evaluated at the Food Crops Research Station of the National Agronomic Research Center in Bouake through six different sowing dates from December 2000 to February 2002. Five varieties of tomato, including a local control, were tested in a Fisher block design repeated four times. Analysis of variance, principal component analysis, Pearson linear correlation, and linear regression were applied to the collected data. The results showed a significant influence of the three climatic parameters on the populations of the insect. The linear double model of the mean temperature and rainfall pair and the number of adults and larvae best described the fluctuations in adults and larvae. This model explained 35.80% of fluctuations in adult populations and 43.20% of those of larvae, thus showing the influence of climate on whitefly in Cote d’Ivoire. Keywords : Whitefly, tomato, variety, sowing date, Tomato yellow leaf curl, Cote d’Ivoire.

Influence de quelques paramètres climatiques sur les effectifs de Bemisia tabaci sur la tomate (<i>Solanum lycopersicum L.</i>)