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    Distribution of Pseudocercospora species causing Sigatoka leaf diseases of banana in Uganda and Tanzania

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    Journal Article (833.2Kb)
    Date
    2020-01
    Author
    Kimunye, J.N.
    Were, E.
    Mussa, F.
    Tazuba, A.
    Jomanga, K.
    Viljoen, A.
    Swennen, R.
    Muthoni, F.K.
    Mahuku, G.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    Sigatoka leaf diseases are a major constraint to banana production. A survey was conducted in Tanzania and Uganda to assess the distribution of Pseudocercospora species and severity of Sigatoka leaf diseases. Pseudocercospora species were identified using species‐specific primers. Sigatoka‐like leaf diseases were observed in all farms and on all cultivars, but disease severity varied significantly (P < 0.001) between countries, districts/regions within countries, altitudinal ranges and banana cultivars. In all regions except Kilimanjaro, P. fijiensis, the causal agent of black Sigatoka, was the only pathogen associated with Sigatoka disease. Mycosphaerella musae was associated with Sigatoka‐like symptoms in Kilimanjaro region. Black Sigatoka disease was more severe in Uganda, with a mean disease severity index (DSI) of 37.5%, than in Tanzania (DSI = 19.9%). In Uganda, black Sigatoka disease was equally severe in Luwero district (mean DSI = 40.4%) and Mbarara district (mean DSI = 37.9%). In Tanzania, black Sigatoka was most severe in Kagera region (mean DSI = 29.2%) and least in Mbeya region (mean DSI = 11.5%). Pseudocercospora fijiensis, the most devastating sigatoka pathogen, was detected at altitudes of up to 1877 m a.s.l. This range expansion of P. fijiensis, previously confined to altitudes lower than 1350 m a.s.l. in East Africa, is of concern, especially for smallholder banana farmers growing the susceptible East African Highland bananas (EAHB). Among the banana varieties sampled, the EAHB, FHIA hybrids and Mchare were the most susceptible. Here, the loss of resistance in Yangambi KM5, a banana variety previously resistant to P. fijiensis, is reported for the first time.
    https://dx.doi.org/10.1111/ppa.13105
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6895
    IITA Authors ORCID
    Rony Swennenhttps://orcid.org/0000-0002-5258-9043
    George Mahukuhttps://orcid.org/0000-0001-8444-8651
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1111/ppa.13105
    Research Themes
    Biometrics; Biotech and Plant Breeding; Plant Production and Health
    IITA Subjects
    Agronomy; Banana; Disease Control; Plant Breeding; Plant Diseases; Plant Health; Plant Production
    Agrovoc Terms
    Diseases; Disease Control; Musa; Pseudocerospora; Bananas; East Africa
    Regions
    Africa; East Africa
    Countries
    Tanzania; Uganda
    Hubs
    Eastern Africa Hub
    Journals
    Plant Pathology
    Collections
    • Journal and Journal Articles4842
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