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Ni\'eb\'e is a food leguminous plant cultivated in tropical Africa for itsseeds rich in proteins. The main problem setted by its production is theconservation of harvests. In the fields as in the stocks, the seeds aredestroyed by pests (bruchids). These bruchids are always associated withseveral entomophagous species of hymenoptera. Four entomophagous species werelisted : an egg parasitoid (U lariophaga Stephan), and three solitary larvaland pupal ectoparasitoids (D. Basalis Rondoni, Pteromalidae; E. vuilletiCrawford and E. orientalis Crawford, Eupelmidae). The survey of the populationsshows that at the beginning of storage, E orientalis is the most abundantspecie (72 %) whereas E. vuilleti and D. Basalis respectively represent 12 %and 16 % of the hymenoptera. During storage, the E orientalis populationdecreases gradually and it disappears completely in less than two months afterthe beginning of storage. E. Vuilleti population becomes gradually moreimportant than D. basalis population which regress until less than 10 % of theemerging parasitoids. E vuilleti adopts ovicide and larvicide behaviour againstD. Basalis. This behaviour explains its population regression inside granaries.If the aggressive behaviour of this Eupelmidae is a constant, that could alsoexplain the disappearance of E orientalis. However if this species ismaintained in stocks, it would be an effective control agent of bruchidsaccording to their parasitic capacities. This study shows that ovicide andlarvicide behaviour of E vuilleti is not expressed against E orientalis. Whenthe females have exclusively the hosts already parasitized by E orientalis,they do not lay eggs. The disappearance of E orientalis could not thus beexplained by the presence of E. vuilleti.

Y a-t-il \'elimination d'Eupelmus orientalis Crawford par Eupelmus  vuilleti Crawford (Hymenoptera : Eupelmidae) des syst\`emes de stockage du  ni\'eb\'e (Vigna unguiculata Walp) ?