Susceptibility of two-week old Lymnaea natalensis to some plant extracts

Abstract

The molluscicidal potency of 17 Nigerian plants extracted by the unevaporated crude water (UECW) method was evaluated on two­ week old Lymnaea natalensis Krauss. Five extracts were not active but extracts of Balanites aegytiaca, Blighia sapida, Boswellia dalzielii, Cissampelos mucronata, Detarium microcarpum, Kigelia africana, Opilia celtidifolia, Parkia clappertoniana, Polygonum limbatum, Pseudocedrela kotschyi, Nauclea latifolia and Securidaca longipedun­culata were molluscicidal. There is potential for their future use in the integrated control of Lymnaea natalensis, as well as other snails. Mortality data for lethal concentration values for ail extracts were analysed by use of probit transformation. The upper and lower fiducial limlts of the LC50 (P = 0.05) were also determined.