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    Identifying when it is financially beneficial to increase or decrease fungicide dose as resistance develops

    Access Status
    Fulltext not available
    Authors
    van den Bosch, F.
    Lopez-Ruiz, Fran
    Oliver, Richard
    Paveley, N.
    Helps, J.
    van den Berg, F.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    van den Bosch, F. and Lopez-Ruiz, F. and Oliver, R. and Paveley, N. and Helps, J. and van den Berg, F. 2018. Identifying when it is financially beneficial to increase or decrease fungicide dose as resistance develops. Plant Pathology. 67 (3): pp. 549-560.
    Source Title
    Plant Pathology
    DOI
    10.1111/ppa.12787
    ISSN
    0032-0862
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/67093
    Collection
    • Curtin Research Publications
    Abstract

    When fungicide efficacy declines due to the development of resistance in the pathogen population, growers have to either change to an alternative mode of action or adjust their treatment programme. Adjustments may include either decreasing (or stopping) use of the mode of action, or increasing the total dose applied (by increasing number of applications and/or dose per application, where permitted) to try to maintain effective disease control. This study explores the circumstances under which increasing/decreasing total applied fungicide is financially optimal. A model based on field data is used to optimize the dose of fungicide applied when fungicide resistance develops in a pathogen population. The model is used to explore contrasting pathosystems and fungicide classes. When qualitative fungicide resistance develops, the shape of the disease–yield loss relationship determines whether the optimal total dose increases or decreases with increasing frequency of resistance in the pathogen population. When quantitative fungicide resistance develops, such that effective control can still be obtained with doses close to the maximum permitted dose, the optimal dose increases with increasing frequency of resistance in the pathogen population.

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