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    Management of cowpea flower thrips, Megalurothrips sjostedti (Thysanoptera, thripidae), in Cameroon

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    Date
    2008
    Author
    Ngakou, A.
    Tamò, M.
    Parh, I.A.
    Nwaga, D.
    Ntonifor, N.N.
    Korie, S.
    Nebane, C.L.N.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    A series of experiments were conducted in Cameroon to investigate options for managing cowpea flower thrips, Megalurothrips sjostedti, via arbuscular mycorrhiza fungi, rhizobia and Metarhizium anisopliae. Six cowpea fields were established in three agroecological zones over a 3-year period. The abundance of both larvae and adults of M. sjostedti was assessed on plants grown from (1) seeds co-inoculated at sowing with arbuscular mycorrhiza fungi (AMF) and rhizobia (mycorrhiza/rhizobia); (2) non-inoculated seeds and plants sprayed three times with M. anisopliae (Metarhizium); (3) seeds co-inoculated at sowing with AMF and rhizobia and plants sprayed three times with M. anisopliae (mycorrhiza/rhizobia/Metarhizium); (4) non-inoculated seeds and plants sprayed three times with the synthetic insecticide deltamethrin; and compared with (5) a control consisting of non-inoculated seeds and unsprayed plants. Results indicate that thrips infestation was associated with the flowering cycle and was higher in the first than in the second cropping season in most agroecological zones. In general, M. sjostedti larval and adult counts were significantly higher (Po0.01) in the control than in other treatments. Compared with the control, treatment insecticide obtained the highest reduction of adults (range 52–95%) and larvae thrips population (64–97%), followed by mycorrhiza/rhizobia/Metarhizium (29–56%) and (29–49%), mycorrhiza/rhizobia (31–49%) and (24–52%), and Metarhizium (25–58%) and (5–52%), respectively. In all of the above treatments, the reduction of thrips led to a subsequent increase of seed yield, although it was not always significant. Apart from two cases (Ngaounde´re´ 2000 and Nkolbisson 1999), biological treatments (Metarhizium, mycorrhiza/rhizobia and mycorrhiza/rhizobia/Metarhizium) consistently reduced grain yield loss in the trials compared with the control at Ngaounde´re´ in 1999 and Maroua 2001. These results are discussed in the context of sustainable management of M. sjostedti populations on cowpea. r 2007 Elsevier Ltd. All rights reserved.
    http://dx.doi.org/10.1016/j.cropro.2007.08.002
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2889
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1016/j.cropro.2007.08.002
    IITA Subjects
    Pests Of Plants; Plant Production; Plant Diseases; Disease Control; Farm Management; Food Security; Handling, Transport, Storage And Protection Of Agricultural Products
    Agrovoc Terms
    Megalurothrips Sjostedti; Arbuscular Mycorrhizal Fungi; Rhizobia; Metarhizium Anisopliae; Agroecological Zones
    Regions
    Africa; Central Africa; West Africa
    Countries
    Cameroon; Benin
    Collections
    • Journal and Journal Articles4835
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