Cassava mosaic geminiviruses associated with cassava mosaic disease in Rwanda

Cassava mosaic disease (CMD), and cassava mosaic geminiviruses (CMGs), were investigated in a country-wide survey conducted in six cassava-producing prefectures (administrative regions) of Rwanda in 2001. CMD occurred throughout the country at an average incidence of 30%. Incidence was highest in Ki...

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Bibliographic Details
Published in:International journal of pest management 2005-03, Vol.51 (1), p.17-23
Main Authors: Sseruwagi, P, Okao-Okuja, G, Kalyebi, A, Muyango, S, Aggarwal, V, Legg, J.P
Format: Article
Language:English
Subjects:
African cassava mosaic virus
Biological and medical sciences
Cassava
cassava mosaic disease
cassava mosaic geminiviruses
cutting infection
disease incidence
disease severity
East African cassava mosaic virus
epidemiological studies
Fundamental and applied biological sciences. Psychology
geographical variation
infection
Manihot esculenta
Pathology. Damages, economic importance
Phytopathology. Animal pests. Plant and forest protection
plant viruses
Plant viruses and viroids
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Summary:Cassava mosaic disease (CMD), and cassava mosaic geminiviruses (CMGs), were investigated in a country-wide survey conducted in six cassava-producing prefectures (administrative regions) of Rwanda in 2001. CMD occurred throughout the country at an average incidence of 30%. Incidence was highest in Kigali (44%) and lowest in Butare (11%). Cutting infection resulting from the use of CMD-affected planting material was the main type of infection. Disease symptoms were generally severe, with little difference between cultivars or locations. Most affected plants lacked the 'candle-stick' symptoms characteristic of severe CMD associated with infection by the 'Uganda Variant' of East African cassava mosaic virus (EACMV-UG2). PCR analysis detected two viruses in CMD-affected plants: African cassava mosaic virus (ACMV) and EACMV-UG2. ACMV predominated and occurred throughout the surveyed areas, whereas EACMV-UG2 was restricted to the prefectures of Byumba, which border south-western Uganda and Kibungo in south-eastern Rwanda. No dual infections were detected.
ISSN:0967-0874
1366-5863
DOI:10.1080/09670870400016750