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    Seasonal abundance of Plutella xylostella (Lepidoptera: Plutellidae) and diversity of its parasitoids along altitudinal gradients of the eastern Afromontane

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    S19ArtNgowiSeasonalInthomDev.pdf (1.229Mb)
    Date
    2019-07
    Author
    Ngowi, B.V.
    Tonnang, H.E.Z.
    Khamis, F.
    Mwangi, E.M.
    Nyambo, B.
    Ndegwa, P.N.
    Subramanian, S.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Monthly field surveys of diamondback moth (DBM), Plutella xylostella (L.) and its parasitoids were conducted to assess seasonal abundance and diversity under changing altitude. Twenty-four crucifer farms spread across three altitudinal zones of Mount Kilimanjaro and Taita hills were sampled for the insects at monthly interval from 2013 to 2014. Diamondback moth abundance differed significantly between seasons (F3, 21 = 3.883, p = 0.024) in the high zone of Taita hills. The abundance among altitudinal zones of the two transects was not significantly different (Mt. Kilimanjaro: F2, 98 = 0.415, p = 0.661; Taita hills: F2, 116 = 0.303, p = 0.739). Eight parasitoid species emerged in the laboratory from collected DBM larvae and pupae. Cotesia vestalis (Haliday) provided the most DBM parasitism in the low zone and Diadegma semiclausum (Hellen) in the medium and high zones. Parasitism by D. semiclausum increased by 32.5% between the low and medium zones (p = 0.001) of Taita hills. Diversity of parasitoid species declined considerably from the low to medium zones of Taita hills. The diversity of wild crucifer species increased with altitude but was twice as diverse in the high zone of Mt. Kilimanjaro than the high zone of Taita hills. Ecological complexity of the cropping system contributed greatly to a wider parasitoid diversity along Mt. Kilimanjaro. The introduced C. vestalis has successfully established in East Africa and adapted to the warmer areas in the low altitudes.
    https://dx.doi.org/10.1007/s12600-019-00732-3
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6177
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s12600-019-00732-3
    IITA Subjects
    Pests Of Plants
    Agrovoc Terms
    Diadegma Semiclausum; Plutella Xylostella; Parasitoids; Tanzania
    Regions
    Africa; East Africa
    Countries
    Tanzania
    Journals
    Phytoparasitica
    Collections
    • Journal and Journal Articles4835
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