首页 | 本学科首页   官方微博 | 高级检索  
   检索      


The incidence of sweet potato virus disease and virus resistance of sweet potato grown in Uganda
Authors:V ARITUA  E ADIPALA  E E CAREY  R W GIBSON
Institution:Namulonge Agricultural and Animal Production Research Institute, PO Box 7084, Kampala, Uganda.;Department of Crop Science, Make re re University, PO Box 7062, Kampala, Uganda.;International Potato Center (C1P), Regional Head Office for Sub-Saharan Africa, PO Box 7856, Nairobi, Kenya.;Natural Resources Institute (NRI), Central Avenue, Chatham Maritime, Kent ME4 4TB, UK
Abstract:Sweet potato virus disease (SPVD) was common (25–30% average incidences), and farmers recognised it as an important disease, in sweet potato crops in southern Mpigi, Masaka and Rakai Districts in Uganda, but SPVD was rare in Soroti and Tororo Districts. Whiteflies, which are the vector of sweet potato chlorotic stunt crinivirus (SPCSV) a component cause of SPVD, were correspondingly common on sweet potato crops in Mpigi and rare on crops in Tororo. However, aphids, which are the vectors of sweet potato feathery mottle potyvirus (SPFMV), the other component cause of SPVD, were not found colonising sweet potato crops, and itinerant alate aphids may be the means of transmission. Different sweet potato cultivars were predominant in the different districts surveyed and four local cultivars obtained from Kanoni in S. Mpigi, where whiteflies and SPVD were common, were more resistant to SPVD than four cultivars from Busia in Tororo District, where whiteflies and SPVD were rare. However, nationally released cultivars were even more resistant than the local cultivars from Kanoni. Yield results and interviews with farmers indicated that farmers in S. Mpigi were making compromises in their choice of cultivars to grow, some key factors being SPVD susceptibility, and the yield, taste, and marketability, duration of harvest and in-ground storability of the storage roots. These compromises need to be included in an assessment of yield losses attributable to SPVD.
Keywords:Sweet potato  aphids  whiteflies  virus  sweet potato virus disease  SPVD  resistance  Uganda  Africa
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号