RESUMO: Cyrtobagous salviniae Calder & Sands, 1985 (Coleoptera: Curculionidae) is a weevil native to South America and distributed worldwide as a biocontrol agent of aquatic weeds of the genus Salvinia Ség. Native populations and aspects of this weevil biology, such as dispersal mechanisms, are still poorly known, especially in southeastern Brazil. Here, we report the first record voucher-based of C. salviniae for the state of Minas Gerais, which not only extends its distribution westward in the southeastern region, but also documents the dispersal of individuals among freshwater ponds via mats of Salvinia auriculata Aubl. displaced during a regional river flood, and briefly discuss the ecological importance of such processes.