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Genetically modified (GM) cowpea seeds expressing αAI-1, an α-amylase inhibitor from the common bean, have been shown to be immune against several bruchid species. Effective control of such pests by growing GM cowpea could promote the spread of bruchid species that are αAI-1 tolerant. Consequently, the sustainability of bruchid pest control could be increased by combining GM seeds and hymenopteran parasitoids. However, there are concerns that αAI-1 could interfere with the biological control provided by parasitoids. Here, we assessed the impact of GM cowpea seeds expressing αAI-1 on the αAI-1-tolerant bruchid  Zabrotes subfasciatus  and its parasitoid  Dinarmus basalis . αAI-1 in cowpea seeds did not increase resistance to  Z. subfasciatus  or affect the mortality rate of  Z. subfasciatus  larvae. Parasitism of  Z. subfasciatus  by  D. basalis  and fitness of  D. basalis  offspring were not affected by the presence of αAI-1. Thus, αAI-1-expressing cowpeas and parasitoids should be compatible for the control of bruchid pests.

plos one

Impact of αAI-1 Expressed in Genetically Modified Cowpea on Zabrotes subfasciatus (Coleoptera: Chrysomelidae) and Its Parasitoid, Dinarmus basalis (Hymenoptera: Pteromalidae)