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Huit virus ont ete signrues sur Ie niebe en Afrique. Les virus du niebe sont decrits pour les basses terres hum ides et subhumides de I'Afrique occidentale ainsi que pour les wnes ecologiques d'rutitude moyenne en Mrique orientale et australe. Chaque fois que les installations sont limitees et qu...
Many isolates of cocoa swollen shoot virus (CSSV) have been found in Ghana. Relationships between these isolates have been based on symptom expression and limited serological information. This paper reports on the serological relationships between 44 accessions of CSSV using the virobacterial agg...
Surveys of the incidence of African cassava mosaic disease (ACMD) and its whitefly vector, Bernisiu tabaci, were made at three-month intervals in 1992 and 1993 along two South-North transects. One was in central and the other in eastern Uganda. ACMD incidence was high within the northern localiti...
The survivorship, fecundity and development time (egg to adult) of Cicadulina storeyi China, C. arachidis China and C. ghaurii Dabrowski were studied at three constant temperatures (20, 25 and 30 .C). Additional tests were conducted to descriptionbe maize streak virus (MSV) transmission by C. ara...
El fríjol común, Phaseolus vulgaris L., es una leguminosa susceptible a un gran número de virus vegetales. Las enfermedades virales del frijol que más atención han recibido por parte de los mejoradores, han sido el mosaico común, la necrosis sistémica o "raíz negra" y el mosaico dorado. En la Amé...
Background Production of cassava (Manihot esculenta Crantz), a food security crop in sub-Saharan Africa, is threatened by the spread of cassava brown streak disease (CBSD) which manifests in part as a corky necrosis in the storage root. It is caused by either of two virus species, Cassava brown s...
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