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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Re-emergence of cassava brown streak disease in Uganda
Plant Disease, Volume 91, No. 1, Year 2007
Notification
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Description
During November 2004, veinal chlorosis on mature cassava leaves, typical of cassava brown streak disease (CBSD), was observed at Mukono in central Uganda. Five out of 11 cultivars at the site showed CBSD symptoms (incidence range 4 to 64%). In a survey of farmers' fields, CBSD was observed in Wakiso and Mukono districts. Incidence of cassava mosaic disease was also recorded and averaged 60% for landraces (range 16.7 to 100%) and 20% for resistant varieties (range 0 to 65%). Leaf samples of plants with CBSD symptoms produced an amplicon of 222 bp using reverse transcription-polymerase chain reaction with primers that amplify a fragment of the coat protein (CP) gene of Cassava brown streak virus. Sequence comparisons based on the amplified CP gene fragment indicated that the isolates have 77 to 82.9% nucleotide and 43.9 to 56.8% amino acid identity with those from Mozambique and Tanzania. There was 95.9 to 99.5% nucleotide and 85.1 to 90.5% amino acid identity among the Ugandan isolates. These results confirm the re-emergence of CBSD in Uganda after it was first observed in the 1930s in cassava introduced from Tanzania and controlled by eradication. Prior to this report, CBSD was known to be restricted to the coastal lowlands of East Africa. © 2007 The American Phytopathological Society.
Authors & Co-Authors
Alicai, Titus
Uganda, Kampala
Namulonge Crops Resources Research Institute
Omongo, Christopher Abu
Uganda, Kampala
Namulonge Crops Resources Research Institute
Maruthi, Midatharahally Narasegowda
United Kingdom, Chatham
Natural Resources Institute
Hillocks, Rory J.
United Kingdom, Chatham
Natural Resources Institute
Baguma, Yona K.
Uganda, Kampala
Namulonge Crops Resources Research Institute
Kawuki, Robert Sezi
Uganda, Kampala
Namulonge Crops Resources Research Institute
Bua, Anton
Uganda, Kampala
Namulonge Crops Resources Research Institute
Otim-Nape, George William
Uganda, Kampala
Namulonge Crops Resources Research Institute
Colvin, John
United Kingdom, Chatham
Natural Resources Institute
Statistics
Citations: 9
Authors: 9
Affiliations: 2
Identifiers
Doi:
10.1094/PD-91-0024
ISSN:
01912917
Research Areas
Genetics And Genomics
Study Design
Cross Sectional Study
Cohort Study
Study Approach
Quantitative
Study Locations
Multi-countries
Mozambique
Tanzania
Uganda