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    Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa

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    Date
    1991
    Author
    Yaninek, J.S.
    Baumgaertner, J.
    Gutiérrez, A.P.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Density-specific sampling plans were developed under African conditions for the exotic spider mite, Mononychellus tanajoa (Bondar), a serious pest of cassava, Manihot esculenta. The within-plant distribution of Mononychellus tanajoa was found to favour new foliage, regardless of time of planting or plant age. Consequently, the first developed leaf near the top of the foliage was selected as the sampling unit and related to whole plant populations of M. tanajoa. The relationship between the mite population's variance and mean as measured by Taylor's Power Law proved to be stable over a range of planting dates, seasons and locations. Two binomial sampling plans, one based on Taylor's dispersion parameters and another based on direct field observations, were developed and compared. Binomial sampling, appropriate only for densities below 30 mites per leaf, was replaced by an enumerative procedure based on a 'quick count' protocol at higher mite densities.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5896
    IITA Subjects
    Cassava
    Agrovoc Terms
    Mononychellus Tanajoa; Manihot Esculenta; Sampling; Fields; Cassava
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4835
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