The Cotesia sesamiae story: insight into host-range evolution in a Hymenoptera parasitoid and implication for its use in biological control programs.

摘要: This review covers nearly 20 years of studies on the ecology, physiology and genetics Hymenoptera Cotesia sesamiae, an African parasitoid Lepidoptera that reduces populations common maize borers in East South Africa. The first part presents based sampling C. sesamiae from crops Kenya. From this agrosystem including one host plant three main borer species, revealed two genetically differentiated species adapted to their local community, showed differentiation involved joint evolution virulence genes sensory mechanisms acceptance, reinforced by reproductive incompatibility due Wolbachia infection status natural inbreeding. In second part, we consider larger ecosystem wild Poales hosting many stem are potential hosts for sesamiae. hypothesis other host-adapted was investigated a large larvae various across sub-Saharan provided information respective contribution hosts, biogeography genetic structure populations. Molecular analyses highlighted several bracovirus were under positive selection, some them being different selection pressure hosts. suggests races result co-evolution acting at scale genes. third considers driving specialization. more or less host-specialized. character is crucial efficient environmentally-safe use enemies biological control pests. One method get insight evolutionary stability host-parasite associations characterize phylogenetic relationships between so-called host-races. Based construction phylogeny samples host- lineages. Mechanisms discussed with regard geography ecology samples. lineage presented all hallmarks distinct which has been morphologically described now studied perspective used as agent against Sesamia nonagrioides Lefebvre (Lepidoptera: Noctuidae), major pest West Africa Mediterranean countries (see Benoist et al. 2017). fourth reviews past present control, points out interest such molecular reconcile biodiversity food security stakes future control.