Prevalence of cassava brown streak and cassava mosaic diseases in Lamu County Kenya

  • C.K. Mutoni Department of Plant Science and Crop Protection, University of Nairobi
  • F.M. Nzuve Department of Plant Science and Crop Protection, University of Nairobi
  • D.W. Miano Department of Plant Science and Crop Protection, University of Nairobi
  • B.M. Kivuva Kenya Agricultural & Livestock Research Organization
  • M.E. Ferguson International Institute of Tropical Agriculture
  • Y.H. Kipkoech Kenya, Kenya Plant Heath Inspectorate Service (KEPHIS) Plant Quarantine Station

Abstract

Demand for cassava is rapidly increasing due to its resilience and ability to mitigate livelihood insecurities among the smallholder farmers as a result of climate change. Despite its importance, cassava production has been declining in Sub-Saharan Africa compared to other parts globally. This is largely due to surge in cassava brown streak viruses (CBSVs), cassava mosaic geminiviruses (CMGs) and their vector, Bemisia tabaci. This has also led to loss of traditional landraces harbouring useful genes vital for future cassava breeding. Of the two diseases, CBSVs is the most devastating causing root necrosis. Emergence of dual infection of CMD and CBSD causes 100% yield losses, economically more than US$1 billion yearly. The overall objective of this study was to determine viral disease incidences among local landraces from farmers’ fields in Lamu County (2.2355° S, 40.4720° E) through a multistage sampling technique. The study targeted farmers growing local landraces at regular pre-etermined intervals of 30 km between farmer’s farms. Fifty-eight plant cuttings and leaf samples were randomly collected. Molecular diagnostics done on the leaf samples detected 39.2% single infection of East Africa cassava mosaic virus (EACMV), 3.6% single infection of Ugandan cassava brown streak virus (UCBSV), 10.7% mixed infection of EACMV, UCBSV and cassava brown streak virus (CBSV). African cassava mosaic virus (ACMV) was not detected in all tested samples. The study identified the need for dual resistant breeding as the only sustainable management strategies of the two major viral diseases of cassava in the county.

Published
2022-05-26
How to Cite
Mutoni, C., Nzuve, F., Miano, D., Kivuva, B., Ferguson, M., & Kipkoech, Y. (2022). Prevalence of cassava brown streak and cassava mosaic diseases in Lamu County Kenya. East African Agricultural and Forestry Journal, 85(1-4), 8. Retrieved from https://www.kalro.org/www.eaafj.or.ke/index.php/path/article/view/499