Distribution, Severity, and Spread of Armillaria Root Disease in Kenya Tea Plantations

Simple item page
dc.contributor.authorWaudo, S. W.
dc.contributor.authorOnsando, J. M.
dc.contributor.authorWargo, P. M.
dc.date.accessioned2014-05-26T08:41:33Z
dc.date.available2014-05-26T08:41:33Z
dc.date.issued1997-02
dc.descriptionhttp://dx.doi.org/10.1094/PDIS.1997.81.2.133en_US
dc.description.abstractSurveys for Armillaria root disease severity were conducted over a 5-year period in small tea farms (0.5 to 1.0 ha) in the 12 tea-growing districts of Kenya. The disease occurred in all tea districts, but severity was greater in the districts east of the Rift Valley. Disease severity was associated with relative amounts of residual woody debris, especially roots, from trees and shrubs present when the land was converted to tea plantations. Excavation of tea bushes in disease centers showed that infection of tea bushes occurred primarily by mycelial growth from residual tree roots and from infected tea roots rather than from rhizomorphs. Rhizomorphs were scarce, and rarely involved in infection. They were confined mostly to the surface of the residual tree roots and were found growing freely in the soil in only one tea district. Rhizomorphs were more abundant in higher elevation plantations than in lower elevation plantations, where they occurred only on residual tree roots in the deeper, cooler, moister levels of the soil. Inoculum from residual tree debris in the soil was the most important source of infection in plantations of seed origin. Secondary spread from infected tea plants to healthy ones was limited and disease centers were small. In tea plantations derived from clonal cuttings, secondary disease spread from infected to healthy tea plants was more important resulting in large disease centers or gaps due to plant death and removal. Currently, soil sanitation by thorough removal of roots of forest trees and prompt removal of infected tea bushes is the best available management practice.en_US
dc.identifier.citationPlant Disease February 1997, Volume 81, Number 2 Pages 133-137en_US
dc.identifier.issn0191-2917
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/9615
dc.language.isoenen_US
dc.publisherAmerican Phytopathological Societyen_US
dc.subjectinoculum sourcesen_US
dc.titleDistribution, Severity, and Spread of Armillaria Root Disease in Kenya Tea Plantationsen_US
dc.typeArticleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Distribution, Severity.....pdf
Size:
4.53 KB
Format:
Adobe Portable Document Format
Description:
abstract
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
RP-Department of Plant and Microbial Sciences