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Occurrence and estimated losses caused by cassava brown streak disease in Migori county, Kenya

Occurrence and estimated losses caused by cassava brown streak disease in Migori county, Kenya

Masinde, Emily Atieno, Ogendo, Joshua Ondura, Maruthi, Midatharahally. N. ORCID: 0000-0002-8060-866X, Hillocks, Rory, Mulwa, Richard M.S. and Arama, Peter Futi (2016) Occurrence and estimated losses caused by cassava brown streak disease in Migori county, Kenya. African Journal of Agricultural Research, 11 (24):12A8CE958959. pp. 2064-2074. ISSN 1991-637X (doi:10.5897/AJAR2016.10786)

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Abstract

Cassava is the second most important staple crop after maize in Migori County. 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) on cassava crops in farmers’ fields. A total of 70 farms (Kuria East = 40; Suna West = 30), with cassava crop aged 7-12 months after planning (MAP), were sampled using stratified random sampling procedure. Data were collected on CBSD incidence (foliar and root), root necrosis score, percent loss (roots) and yield traits (number and weight of fresh roots). Results showed mean foliar incidences of 58.5% and 53.9% in Kuria East and Suna West sub-counties, respectively. High foliar CBSD incidences were recorded in Kuria East sub-county with range of 54.0-74.0% observed in five local varieties; Manchoberi, Amakuria, Mwitamajera, Weite and Nyakohanda. A similar result trend was recorded in Suna West sub-county with a range of 52.1-77.5% in six varieties; Mary go round, MH95/0183 (improved), Ondielo, Nyakasanya, Nyakasamuel and Obarodak. Highest root necrosis scores and percent root loss were observed in two local varieties, Amakuria (2.4; 36.7%) and Agric IV (3.7; 40%), in Kuria East and Suna West sub-counties, respectively. Correlation analysis revealed strong positive correlation between root necrosis, root necrosis incidence and percent root loss; which implies that susceptible varieties suffer greatest loss. The estimated mean root yield loss caused by CBSD stood at 10.5% (equivalent: US 405 ha-1) and 7.2% (equivalent: US 384.30 ha-1) in Kuria East and Suna West sub-counties, respectively. The findings of this study are expected to provide impetus for the development and promotion of new high yielding, locally adapted and CBSD resistant cassava varieties.

Item Type: Article
Additional Information: All articles published by Academic Journals are licensed under the Creative Commons Attribution 4.0 International License. This permits anyone to copy, redistribute, remix, transmit and adapt the work provided the original work and source is appropriately cited.
Uncontrolled Keywords: Cassava, CBSD, incidence, Root necrosis, Yield loss
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agricultural Biosecurity Research Group
Last Modified: 12 Sep 2017 11:25
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/15157

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