Browsing by Author "Hakiza, G."

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Characterization of the Coffee Wilt Pathogen in Uganda
    (Phytopathology, 2003) Ivey, M.L. Lewis; Miller, S.A.; Hakiza, G.; Geiser, D.M.
    Sixteen isolates of Fusarium sp. were isolated from robusta coffee trees in Uganda with symptoms of vascular wilt and characterized based on morphology and partial DNA sequences of translation elongation factor 1-alpha (ef) and beta-tubulin (bena). Fusarium sp. isolates from robusta and arabica coffee trees in Zimbabwe, New Caledonia and Ethiopia were also characterized. Phylogenetic analyses indicated that these isolates represent a new species lineage in the African clade of the Gibberella fujikuroi species complex (GFC). The species most commonly associated with this disease, Fusarium xylarioides, is not a member of GFC, suggesting that recent outbreaks of vascular wilt in Uganda may have been caused by a new pathogen
  • Thumbnail Image
    Item
    Characterization of the coffee berry disease pathogen, Colletotrichum kahawae sp. nov.
    (Mycological Research, 1993) Waller, J.M.; Bridge, P.D.; Black, R.; Hakiza, G.
    A range of Colletotrichum isolates from coffee, including the coffee berry disease (CBD) pathogen, and representative isolates of C. gloeosporioides from some other tropical crops are compared. Isolates of the CBD pathogen taken from across its range of distribution in Africa have common morphological, biochemical and pathogenic characteristics. These distinguish them from other Colletotrichum isolates. The nomenclature of the CBD pathogen, often referred to as a form of C. coffeanum, is confused. Its taxonomic position is discussed and the new species name Colletotrichum kahawae is introduced.
  • Thumbnail Image
    Item
    Coffee Wilt Disease: a major constraint to coffee production in Africa
    (CIRAD, 2006) Bieysse, D.; Lepoint, P.; Hakiza, G.; Kalonji, A.; Maraite, H.
    CWD was first observed on Coffea excelsa in Central Africa Republic (CAR) in 1927. From the 1940s to the 1960s the disease caused considerable destruction to C. excelsa and C. canephora in Central and West Africa, killing trees within two months to two years of the first appearance of symptoms. Systematic elimination of affected plants over vast areas and deployment of resistant varieties virtually eradicated CWD in these regions. However, in the late 1970s CWD “re-appeared” on C. canephora in Northeast Democratic Republic of Congo (DRC), and was subsequently reported in neighbouring Uganda (1993) and Tanzania (2000) causing renewed and extensive damage. In Uganda alone, where C. canephora accounts for 85% of exported coffee, CWD has destroyed 120 million (45%) trees and reduced the country’s share of the international market from 7% to 3% in just 10 years. C. arabica, although also cultivated in these countries, remains unaffected despite CWD having caused damage to C. arabica in Ethiopia since 1957