“…In many diverging populations of Lepidoptera, ecological factors such as host plant use coâvary with differences in sexual signals (Groot et al, ; Joyce et al, ), but in few cases has the relative contribution of these factors to genetic structure been tested (Gouin et al, ; Prowell, McMichael, & Silvain, ). Ostrinia nubilalis is an emerging model for speciation dynamics due to sympatric ecotypes or strains that vary in voltinism and sexâpheromone communication (Coates et al, ; Dopman et al, ; Kozak et al, ; Lassance, ; Olsson et al, ). Ecological differences in host plant preference occur between closely related O. nubilalis strains in North America (O'Rourke et al, ) and among Ostrinia species in Europe (Bethenod et al, ; Bourguet, Bethenod, Trouve, & Viard, ; Bourguet et al, ; Frolov et al, ; PĂ©lozuelo, Malosse, Genestier, Guenego, & FrĂ©rot, ; PĂ©lozuelo et al, ; Thomas, Bethenod, Pelozuelo, FrĂ©rot, & Bourguet, ).…”