Maina, M.J.2015-09-232015-09-232003Maina, M.J. (2003). The Occurrence of Viruses and Aphid Vectors in Small Scale Potato Seed Production System and Their Effect on Yield Kenya. (Masters Degree Thesis). University of Nairobi. p.98http://kalroerepository.kalro.org/handle/0/13355The overall objective of this study was to determine the incidence and distribution of Potato viruses, relationship to aphid vector population and effect of these vims diseases on yield loss and seed quality of different potato varieties in Kenya. The study was carried out in 3 phases, which were a field survey, on-farm monitoring and an on-station experiment on aphids and viruses.enhttp://creativecommons.org/licenses/by/3.0/Book112VirusesAphidsVectorsSeed productionCrop protection