• Login
    • Login
    Advanced Search
    View Item 
    •   UoN Digital Repository Home
    • Journal Articles
    • Faculty of Science & Technology (FST)
    • View Item
    •   UoN Digital Repository Home
    • Journal Articles
    • Faculty of Science & Technology (FST)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Entomopathogenic nematodes as a tool for the management of sweetpotato weevil cylas puncticollis boheman in Kenya

    Thumbnail
    Date
    2009
    Author
    Kimenju, J.W
    Olubayo, F.
    Nderitu, J.H
    Mwaniki, S.W
    Type
    Article
    Language
    en
    Metadata
    Show full item record

    Abstract
    Entomopathogenic nematodes Heterorhabditis indica, Steinernema karii and Steinernema yirgalemense from Kenya were tested against the sweet potato weevil Cylas puncticollis Boheman in laboratory bioassays and in the field for three consecutive seasons. The trials were carried out at the Kenya Agricultural Research Institute, Kabete. Sweet potato varieties KSP20, K004 (Kakamega 4) and (K10) Kemb 10 were also evaluated for susceptibility to the weevil in the field for one season and Kemb 10, the most susceptible variety tested in subsequent seasons. The assessments were carried out during growth, at harvest and one month after harvest. The conventional pesticide bifenthrin, the entomopathogenic nematode Steinernema carpocapsae ex UK strain and control were used for comparative purposes. Mean percent weevil larval mortality was 76, 71 and 48 for H. indica, S. yirgalemense and S. karii respectively and adult mortality was 12.5% for H. indica, S. yirgalemense and 25% for S. karii. Kemb 10 was the most susceptible sweet potato variety, K004 the most tolerant and KSP20 moderately tolerant. Nematodes reduced weevil infestations only slightly if initial infestations were over 80% and the weather conditions dry. The nematodes however reduced the rate of weevil development in tubers in the store by 75%. Nematodes were as effective as bifenthrin when weevil infestations were moderate (<40%) and the weather cool and moist. S. carpocapsae the ex-UK strain was the most effective on the weevil overall but H. indica was the most effective indigenous nematode. H. indica when used with appropriate insecticides in a sequential manner was an effective strategy for sweet potato weevil management.
    URI
    http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/14404
    Citation
    E. Afr. agric. For. J. (2009) 75(2), 89 -95
    Publisher
    Entomology Department, Kenya Agricultural Research Institute, NARL-Kabete
     
    University of Nairobi
     
    Collections
    • Faculty of Science & Technology (FST) [4284]

    Copyright © 2022 
    University of Nairobi Library
    Contact Us | Send Feedback

     

     

    Useful Links
    UON HomeLibrary HomeKLISC

    Browse

    All of UoN Digital RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Copyright © 2022 
    University of Nairobi Library
    Contact Us | Send Feedback