Abstract
A farm survey was conducted in Kuria East and Suna West sub-counties to determine the incidence, severity and estimated losses of cassava brown streak disease (CBSD) and cassava mosaic disease (CMD) on cassava crops in farmers’ fields. The results showed that cassava is the second most important staple crop after maize in Migori County. CMD incidence ranged from 0.0 to 56.7%) in Kuria East and 10.0 to 55.0% in Suna West. CBSD incidences were much higher at 5.0 to 74.0% in Kuria East and 10.0 to 77.5% in Suna West. Both CMD and CBSD had an effect on yield reduction and total root loss ranged from 10.7 to 47.2% in Kuria East and 11.5 to 33.2 in Suna West. The percent mean total root loss in Kuria East was 25.9%; equivalent to 1299.6 US dollars/ha while in Suna East was 24.7%; equivalent to 1259.5 US dollars/ha. The best performing variety with regards to low CBSD and CMD incidence, low root losses and high yield were TMS 30572 and MH95/0183. The findings of this study are expected to provide impetus for the development and promotion of new high yielding, locally adapted and resistant cassava varieties. Key words: Cassava, CBSD, incidence, root necrosis, yield loss.
Highlights
Cassava (Manihot esculenta Crantz) is a staple food for more than 800 million people world-wide (Lebot, 2009)
The results showed that cassava is the second most important staple crop after maize in Migori County
The cassava brown streak disease (CBSD) is caused by two distinct viruses: cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV), both of which have (+)ss RNA genomes belong to the genus Ipomovirus in the family Potyviridae, and generally produce similar symptoms in infected plants (Winter et al, 2010; Ndunguru et al, 2015; Vanderschuren et al, 2012; Legg et al, 2011)
Summary
Cassava (Manihot esculenta Crantz) is a staple food for more than 800 million people world-wide (Lebot, 2009). It was initially adopted as a popular famine reserve crop but in recent times has emerged to be a profitable cash crop of industrial significance in the world economy (Larsson et al, 2013; Tonukari et al, 2015). The CBSD is caused by two distinct viruses: cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV), both of which have (+)ss RNA genomes belong to the genus Ipomovirus in the family Potyviridae, and generally produce similar symptoms in infected plants (Winter et al, 2010; Ndunguru et al, 2015; Vanderschuren et al, 2012; Legg et al, 2011). Root spoilage occurs due to constriction caused by dry corky necrotic rot on starchy tissues and stunted growth on infected plants (Winter et al, 2010; Hillocks and Jennings, 2003)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
