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    Parasitism of Bemisia tabaci (Homoptera: aleyrodidae) by Eretmocerus mundus (Hymenoptera: aphelinidae) on cassava

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    S08ArtOtimParasitismInthomDev.pdf (248.6Kb)
    Date
    2008
    Author
    Otim, M.
    Kyalo, G.
    Kyamanywa, S.
    Asiimwe, P.
    Legg, J.P.
    Guershon, M
    Gerling, D.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Parasitism rates of Bemisia tabaci(Gennadius) and searching and oviposition behaviours of its parasitoid Eretmocerus mundus Mercet were compared on two cassava varieties: a glabrous variety, Nase 4 and a hirsute variety, MM970245 withc.88 leaf hairscm2. Parasitism was assessed after potted plants of both varieties were exposed in open fields to natural infestation byB. tabaciand its natural enemy. For the behavioural studies, naive, less than 24-h-old females were individually observed on infested cassava leaflets under a microscope for a maximum of 1 h each. The different foraging behaviours were recorded using the computer software ‘The Observer 5.0’ (Noldus Ltd, Wageningen, The Netherlands). Total per cent parasitism and parasitism by E. Mundus did not differ significantly between varieties. Upon encounter with leaf hairs, the parasitoids stopped and groomed before resuming the host search. The frequency of repeat probing, host feeding and anten nation after probing and host feeding were higher on the glabrous than on the hirsute variety, while the converse was observed when feeding on liquids on the leaf. The duration of host assessment, initial probing, grooming and resting on the leaf was higher on the glabrous than on the hirsute variety. Leaf hairiness at the density investigated caused some changes in the behaviour of the parasitoids, but did not have an overall effect on field parasitism. Since cassava is generally considered to have labrous leaves and the variety MM970245 is one of the most hirsute varieties, we discount leaf hairiness as a factor in determining levels of parasitoid activity.
    https://doi.org/10.1017/S1742758408093181
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3531
    Digital Object Identifier (DOI)
    https://doi.org/10.1017/S1742758408093181
    IITA Subjects
    Cassava; Plant Diseases
    Agrovoc Terms
    Bemisia Tabaci; Eretmocerus Mundus; Behavior; Manihot Esculenta; Parasitism
    Regions
    Africa; East Africa
    Countries
    Uganda
    Collections
    • Journal and Journal Articles4835
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