Eurhinus magnificus Gyllenha was first reported in Florida in 2002 (Feiber, 2002). In 2005 all stages of this weevil were collected repeately in both Broward and Miami-Dade Counties (Ulmer et al., 2007). The genus, Eurhinus includes 23 species that are widely distributed in Central and South America (Vaurie, 1982). The only verified host plant of E. magnificus in Florida is Cissus verticillata (L.) Nicolson & Jarvis (Vitaceae). Florida's flora contains native species of all four host genera including Cissus, Vernonia, Andria, Mikania (Vaurie, 1982) which are also represented by species occuring over a wide range in the United States (USDA, 2006). The common name of C. verticillata includes, possum grape wine, princess vine, West Indian treebine, season vine and is widely distributed in the Caribbean countries, Central and South America, and Mexico.
Belize, Costa Rica, Guatemala, Honduras, Nicaragua and Panama.
Plants belonging to four genera including Cissus, Vernonia, Andria, and Mikania.
Adults feed on the outer layers of host plant stems, within cavities created in the stems, and leaf petioles. Larvae induce galls on the stems and feed inside these galls.
Biological and Ecological Notes
Female lays single eggs in the stem and developing larvae feed on plant juices within gall formed by the developing larva (Bondar, 1948). Occasionally, 1-2 eggs are laid within a single host plant internode. Gall formation becomes detectable by the 1-3 instar larva. The largest diameter of the gall is at the pupal stage. At this stage, the mean stem size is 4.2 mm and the mean gall size is 9.2 mm. In an outdoor green house study, eggs hatch in 5 days, 1st instar (7 days), 2nd instar (4 days), 3rd instar (10 days), 4th instar (8 days), 5th instar (45 days), pupa (9 days) and adult stage lasts in 7 days at the mean air temparature of 20 celssius (Ulmer et al., 2007).
Bondar, G. 1948. Notas entomologicas da Baia XX. Rev. Entomol., Rio de. J. 19 (1-2): 1-54.
Fieber, D. 2002. Plant industry update. Florida Department of Agriculture and Consumer Services. Fall 2002, p. 4. Access on 20 Septemer 2010 from www.doacs.state.fl.us/pi/images/F02newsletter.pdf.
Ulmer B.J., R. E. Duncan, J. Prena, and J.E. Pena. 2007. Life histroy and larval development of Eurhinus magnificus Gyllenhal (Coleoptera: Curculionidae), a new weevil to the United States. Neotropical Entomology, 36 (3): 383-390.
United States Department of Agriculture (USDA). 2006. Natural Resources Conservation Service. Plant Database. Access on 20 September 2010 from http://plants.usda.gov.
Vaurie, P. 1982. Revision of Neotropical Eurhin (Coleoptera: Curculionidae, Baridinae). Novitates 2753: 1-44.