The exotic weevil Stenopelmus rufinasus Gyllenhal, 1835 (Coleoptera: Curculionidae) across a “host-free” pond network

Abstract

The exotic weevil Stenopelmus rufinasus Gyllenhal, 1835 (Coleoptera: Curculionidae) across a "host-free" pond network The presence of the exotic weevil Stenopelmus rufinasus (Coleoptera: Curculionidae) is closely related to the occurrence of the exotic red water fern, Azolla filiculoides. In this paper, we present the first records of S. rufinasus in Doñana National Park (SW Spain), based on sampling of macroinvertebrates in 91 temporary ponds, including monthly samples of 22 ponds, during two successive years (2005)(2006)(2007). The exotic weevil was present in 21% of the sampled ponds where the host plant, A. filiculiodes, was not detectable. Because A. filiculoides can reach high densities in an adjacent area of marsh, we suggest that the occurrence of the exotic weevil in these ponds is a consequence of dispersal from nearby marshes. Our study demonstrates that S. rufinasus adults can occur at relatively high densities in ponds where the host plant is not present, suggesting that such apparently "host-free" sites may act as stepping stones for the spread of this species.

Geïntegreerde beheersing van ziekten en plagen in teelten van kroosvaren (Azolla)

“…De laatste tijd zijn echter meerdere waarnemingen gedaan van het overleven en foerageren op andere waterplanten. (Florencio et al, 2015;Parys et al, 2015). Kroosvlinders behoren tot de grasmotten (Crambideae).…”