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    Mixplanting pubescent and glabrous cassava affects abundance of Typhlodromalus aripo and its prey mite Mononychellus tanajoa

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    Date
    2014
    Author
    Onzo, A.
    Hanna, R.
    Toko, M.
    Type
    Journal Article
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    Abstract/Description
    There is an increasing awareness that vegetation diversity can affect herbi-vore and natural enemy abundance and that plants can play a major rolein directly manipulating natural enemy abundance for protection againstherbivore attacks. Using data from cassava fields, we aimed at (i) testingthe capacity of the predatory miteTyphlodromalus aripoto control the her-bivorous miteMononychellus tanajoain a chemical exclusion trial; and (ii)testing, based on the differential preference byT. aripofor cassava culti-vars, how combinations of two morphologically different cassava cultivarswith differential suitability to the predator can improve its populationdensities on the non-favourable cultivar, thereby reducingM. tanajoaden-sities with subsequent increases in cassava yield. The study was conductedin a cassava field in Benin, West Africa. The experiments confirmed thatT. aripoeffectively suppressesM. tanajoapopulations on both cultivarsand showed, in the no-predator-exclusion experiments, that cultivar com-binations have significant effects onM. tanajoaandT. aripodensities.Indeed,T. aripoload on the non-preferred cultivar was lowest in subplotswhere the proportion ofT. aripo-preferred cultivar was also low, while,and as expected,M. tanajoaload on the non-preferred cultivar showeddecreasing trends with increasingT. aripodensities. The possible mecha-nisms by which cultivar mixing could increase predator load on the non-favourable cultivar were discussed. Our data showed that appropriatecultivar combinations effectively compensate for morphologically relateddifferences in natural enemy abundance on a normally predator-deficientcultivar, resulting in lower pest densities on the non-favourable cultivar.In practical terms, this strategy could, in part, enhance adoption of culti-vars that do not support sufficient levels of natural enemies for pest con-trol.
    https://dx.doi.org/10.1111/jen.12084
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1000
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1111/jen.12084
    IITA Subjects
    Cassava
    Agrovoc Terms
    Manihot Esculenta; Phytoseiidae; Tetranychidae; Biological Control; Cassava; Mononychellus Tanajoa
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Journal of Applied Entomology
    Collections
    • Journal and Journal Articles4835
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