Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 512357
Title Pre-release evaluation of Neochetina weevils potential for the management of Eichhornia crassipes [Mart.] Solm. In the Rift valley of Ethiopia
Author(s) Gebregiorgis, F.Y.; Struik, P.C.; Lantinga, E.A.; Taye, T.
Source Academia Journal of Agricultural Research 4 (2016)7. - ISSN 2315-7739 - p. 394 - 403.
Department(s) Farming Systems Ecology
Crop Physiology
Publication type Refereed Article in a scientific journal
Publication year 2016
Abstract The present study aimed at evaluating the host-specificity, potential efficacy and optimum densities of the two weevils (Neochetina bruchi and N. eichhorniae) as water hyacinth control agents in the Rift Valley of Ethiopia. Density-plant damage relationship was monitored for two years (2012 to 2014) in a factorial experiment by involving the two Neocthenia weevils and four densities of herbivory. Feeding multiple-choice and oviposition tests were used to assess the two weevils host specificity. The study showed highly significant (P< 0.01) impacts of the two weevils as well as, their interactions on number of ramets, number of leaves, damaged leaf area, petiole length, number of defoliated petioles and biomass of water hyacinth. Damaged leaf area (97%) and total number of defoliated petioles (2.8) were highest in plants that received three pairs of N. bruchi and two pairs of N. eichhorniae. The weevil density and water hyacinth biomass showed convex relationship that could be well-described by a negative log function (R2=0.98). The study confirmed that the weevils are sufficiently host-specific and therefore can be safely released in the Rift Valley of Ethiopia to control water hyacinth.
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