Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa
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...
| Autores principales: | , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1991
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| Acceso en línea: | https://hdl.handle.net/10568/101693 |
| _version_ | 1855514673542070272 |
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| author | Yaninek, John S. Baumgaertner, J.U. Gutiérrez, A.P. |
| author_browse | Baumgaertner, J.U. Gutiérrez, A.P. Yaninek, John S. |
| author_facet | Yaninek, John S. Baumgaertner, J.U. Gutiérrez, A.P. |
| author_sort | Yaninek, John S. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| 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. |
| format | Journal Article |
| id | CGSpace101693 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1991 |
| publishDateRange | 1991 |
| publishDateSort | 1991 |
| record_format | dspace |
| spelling | CGSpace1016932024-01-12T10:00:54Z Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa Yaninek, John S. Baumgaertner, J.U. Gutiérrez, A.P. mononychellus tanajoa manihot esculenta sampling fields cassava 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. 1991 2019-06-25T17:08:59Z 2019-06-25T17:08:59Z Journal Article https://hdl.handle.net/10568/101693 en Limited Access Yaninek, J.S., Baumgaertner, J. & Gutierrez, A.P. (1991). Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa. Bulletin of Entomological Research, 81, 201-208. |
| spellingShingle | mononychellus tanajoa manihot esculenta sampling fields cassava Yaninek, John S. Baumgaertner, J.U. Gutiérrez, A.P. Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa |
| title | Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa |
| title_full | Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa |
| title_fullStr | Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa |
| title_full_unstemmed | Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa |
| title_short | Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa |
| title_sort | sampling mononychellus tanajoa acari tetranychidae on cassava in africa |
| topic | mononychellus tanajoa manihot esculenta sampling fields cassava |
| url | https://hdl.handle.net/10568/101693 |
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