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    Witchweed [Striga hermonthica (Del.) Benth] control using imazapyr seed coating in maize hybrids in the Nigerian savannah

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    Journal Article (457.6Kb)
    Date
    2020-08
    Author
    Chikoye, D.
    Lum, A.F.
    Menkir, A.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Witchweed [Striga hermonthica (Del.) Benth] is a major parasitic weed of most cereal crops in Africa, including maize. Seed treatment with low doses of acetolactate synthase–inhibiting herbicides, such as imazapyr, was introduced in the 1990s to control witchweed. Field trials were conducted in four locations in Nigeria in 2007 and 2008, to assess the effect of coating seeds of several maize hybrids with imazapyr on witchweed control. The hybrids had genes for imidazolinone herbicide resistance (IR), as well as genetic tolerance to witchweed (ST). Treatments were 12 IR maize hybrids with ST and three checks without the IR gene (commercial, witchweed tolerant, and witchweed susceptible hybrids). Averaged across all locations, the coated IR hybrids with ST yielded more and supported fewer witchweed plants than the uncoated IR hybrids with ST. The IR hybrids with ST yielded 57%–60% more than the commercial and witchweed tolerant hybrid checks that were not coated. The witchweed susceptible hybrid check suffered a yield loss of 88% under infestation without seed coating. The IR hybrids with ST yielded 3564 kg ha−1 of grain when coated with imazapyr and 3266 kg ha−1 otherwise. The findings indicate that coating of IR/ST maize seeds with imazapyr improved tolerance to witchweed.
    https://dx.doi.org/10.1139/cjps-2019-0139
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7659
    IITA Authors ORCID
    David Chikoyehttps://orcid.org/0000-0002-6047-9821
    Abebe Menkirhttps://orcid.org/0000-0002-5907-9177
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1139/cjps-2019-0139
    Research Themes
    Biotech and Plant Breeding; Plant Production and Health
    IITA Subjects
    Agronomy; Food Security; Maize; Plant Breeding; Plant Diseases; Plant Health; Plant Production; Weeds
    Agrovoc Terms
    Imazapyr; Imidazolinone Herbicides; Seed Treatment; Striga Hermonthica; Maize; Witchweed
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Southern Africa Hub; Headquarters and Western Africa Hub
    Journals
    Canadian Journal of Plant Science
    Collections
    • Journal and Journal Articles4835
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