BioControl

, Volume 50, Issue 4, pp 635–645 | Cite as

Biological control of three floating water weeds,Eichhornia crassipes, Pistia stratiotes, and Salviniamolesta in the Republic of Congo

Article

Abstract

Since 1999, four specific weevils (Coleoptera, Curculionidae) were released in the Republic of Congo against three exotic floating water weeds: Neochetinaeichhorniae Warner and N. bruchi Hustache against water hyacinth, Neohydronomusaffinis Hustache against water lettuce, and Cyrtobagoussalviniae Calder and Sands against water fern. Recoveries of exotic weevils were made from all 24 release sites except one, and all four species have established and spread (up to 800 km for water hyacinth weevils). Within a few years of releases, control of water fern and water lettuce was such that fishing and navigation could be resumed, while reductions of water hyacinth populations were only beginning.

Keywords

Araceae Biological control Coleoptera Congo Curculionidae Cyrtobagoussalviniae Eichhorniacrassipes floating water weeds Neochetina spp. Neohydronomusaffinis Pistiastratiotes Pontederiaceae Salviniaceae Salviniamolesta 

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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Ministère de l’Economie Forestière et de l’EnvironnementBrazzavilleCongo
  2. 2.Biological Control Centre for AfricaInternational Institute of Tropical AgricultureCotonouBénin

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