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    An overview of a systems model of cassava and cassava pests in Africa

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    Journal Article (609.2Kb)
    Date
    1987
    Author
    Gutierrez, A.P.
    Wermelinger, B.
    Schulthess, F.
    Baumgärtner, J.U.
    Yaninek, J.S.
    Herren, H.R.
    Neuenschwander, P.
    Lohr, B.
    Hammond, W.N.O.
    Ellis, C.K.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    A systems model is described for cassava, Manihot esculenta Crantz, two of its introduced herbivores, the cassava green mite (CGM), Mononychellus tanajoa (Bondar), sensu lato, and the cassava mealybug (CM), Phenacoccus manihoti Mat.-Ferr., the introduced CM parasitoid, Epidinocarsis lopezi (DeSantis) and coccinellid predator of the genus Hyperaspis. The systems model includes the effects of weather, soil nitrogen and water levels on the interactions of the system’s components. The model simulates the distribution of developmental times of cohorts initated at the same time, as well as the number and biomass (energy) dynamics of all populations over time. Biomass acquisition and allocation at the population and organism subunit levels (e.g. leaves, fruit, ova) were also simulated. A common acquisition (i.e. functional response) submodel was used to estimate daily photosynthetic as well as nitrogen and water uptake rates in cassava, in addition to herbivory, parasitism and predation rates for the arthropod species. This paper presents an overview of the systems model. Simulation results for the plant under pest free conditions were compared to field data. In addition, the model was used to estimate tuber yield losses due to CM and CGM feeding, and to examine the beneficial effects of introduced CM natural enemies as measured by reductions in tuber yield losses.
    https://dx.doi.org/10.1017/S1742758400023195
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6944
    IITA Authors ORCID
    Peter NEUENSCHWANDERhttps://orcid.org/0000-0003-0580-0376
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1017/S1742758400023195
    IITA Subjects
    Agronomy; Cassava; Disease Control; Food Security; Pests of Plants; Plant Breeding; Plant Diseases; Plant Health; Plant Production
    Agrovoc Terms
    Cassava; Phenacoccus Manihoti; Mononychellus Tanajoa; Epidinocarsis Lopezi; Hyperaspis; Africa; Systems; Models; Simulation Models
    Regions
    Africa South of Sahara
    Journals
    International Journal of Tropical Insect Science
    Collections
    • Journal and Journal Articles4835
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