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Potential of combining the parasitoid Dinarmus basalis (Hymenoptera : Pteromalidae) with varietal resistance for the control of the cowpea bruchid Callosobruchus maculatus (Coleoptera: Bruchidae)
Abstract
In this study, the potential of combining D. basalis with a resistant cowpea variety IT81D–994 for the control of C. maculatus populations was analyzed, with the use of TN 5-78, a susceptible variety as control.
The result obtained showed that, in absence of D. basalis, the development time and the percentage of eggs mortality were not significantly different for both varieties. However, the variety IT81D–994 reduced significantly the bruchids larval development by causing higher mortality of larvae. The rate of larval mortality was 80% for this variety in the absence of the parasitoid D. basalis. The dynamic study of the bruchids populations showed that the combination of D. basalis reduced significantly the evolution of bruchids at storage. In fact, for both treatments, the number of bruchids was more important in jar with D. basalis than those without this parasitoid. For the IT81D–994, the evolution of bruchids population was completely
inhibited when the parasitoid was associated to the variety. Thus, the strategy combining D. basalis with varietal resistant was a potential way to control bruchids population in the field and in the storage system.
The result obtained showed that, in absence of D. basalis, the development time and the percentage of eggs mortality were not significantly different for both varieties. However, the variety IT81D–994 reduced significantly the bruchids larval development by causing higher mortality of larvae. The rate of larval mortality was 80% for this variety in the absence of the parasitoid D. basalis. The dynamic study of the bruchids populations showed that the combination of D. basalis reduced significantly the evolution of bruchids at storage. In fact, for both treatments, the number of bruchids was more important in jar with D. basalis than those without this parasitoid. For the IT81D–994, the evolution of bruchids population was completely
inhibited when the parasitoid was associated to the variety. Thus, the strategy combining D. basalis with varietal resistant was a potential way to control bruchids population in the field and in the storage system.
