Explanation of Names
Stenopelmus rufinasus Gyllenhal 1835
(L). 'red nose' (1)
widely dist. in US (CA-FL-NJ-OR) / Mex. (3)(4)
native to our area, introduced to many temperate areas around the globe both accidentally (along with its host, the invasive Azolla filiculoides) as well as deliberately as a biological control.
The females deposit eggs in holes that they have chewed in the water fern, and the hole is covered with a cap of frass. The larvae feed voraciously and are capable of eating several plants a day (McConnachis et al. 2004)
McConnachis A.J., Hill M.P., Byrne M.J. (2004) Field assessment of a frond-feeding weevil, a successful biological control agent of red waterfern, Azolla filiculoides, in southern Africa. Biological Control 29: 326-331.
Pemberton R.W., Bodle J.M. (2009) Native North American azolla weevil, Stenopelmus rufinasus
(Coleoptera: Curculionidae), uses the invasive Old World Azolla pinnata
as a host plant. Florida Entomologist 92: 153-155 (Full Text