Calatayud Paul-André auteur aut IRD Gitau C. auteur aut IRD Calatayud S. auteur aut IRD Dupas Stéphane auteur aut IRD Le Rü Bruno auteur aut IRD Silvain Jean-François auteur aut IRD text journalArticle eng text/pdf born digital access Two mitotypes of Busseola fusca (Fuller) (Lepidoptera: Noctuidae) named KI and KII, co-exist in Kenya. Individuals of KII are more widely distributed than those of KI. The present study assessed whether this was due to differences in their reproductive potential and/or in their resistance to the braconid Cotesia sesamiae Cameron, which is the most common larval parasitoid of B. fusca in the region. Two populations of the parasitoid, one from the coastal and one from the inland regions of Kenya, which differ in their ability to develop in B. fusca, were tested. Virgin KII females started to call sooner during the night than KI females. Female fecundity and egg viability were significantly lower for the heterogamous than the homogamous crosses. Cotesia sesamiae from the inland produced larger progeny in KI than in KII host. Cotesia sesamiae from the coast did not develop in either host. Despite their long time co-existence in the same geographical area, KII and KI conserved biological differences in terms of time of calling, fecundity, fertility and resistance against the larval parasitoid, C. sesamiae. This might explain the wider distribution of KII as compared to KI in Kenya. specialized Africa Braconidae Hymenoptera Lepidoptera maize Noctuidae population genetics stemborer 076 135 6 423-429 2011 0931-2048 https://www.documentation.ird.fr/hor/fdi:010053613 10.1111/j.1439-0418.2010.01561.x 0931-2048 [F B010053613] https://www.documentation.ird.fr/hor/fdi:010053613 https://www.documentation.ird.fr/intranet/publi/2011/06/010053613.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-07-01 2017-08-23 fdi:010053613 fre