Relationships of Fungicide Application to Late-Blight Development and Potato Growth Parameters in the Tropical Highlands of Uganda and Kenya
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Date
2001
Journal Title
Journal ISSN
Volume Title
Publisher
International Potato Center
Abstract
The impact of fungicide applications on late blight development, potato
growth parameters, and yield was quantified at field sites in Kenya and
Uganda during the 1999 and 2000 cropping seasons. In Kenya, three potato
varieties were evaluated at two sites, at altitudes of 1800 m and 2200 m. In
Uganda, three varieties were evaluated at one site at an altitude of 2400 m.
Leaf, stem, root, and tuber biomass were sampled and quantified during the
cropping season. Dithane M-45 fungicide was applied to the experimental
plots at the onset of disease at intervals of 7, 14, and 21 days. Final tuber
yields differed significantly by as much as 15% between fungicide-treated
and untreated controls across the three sites. The severity of late blight
differed among sites and between years as a result of variations in environmental conditions. Fungicide application intervals significantly affected
disease progress, and the area under disease progress curve (AUDPC) was
significantly lower in the fungicide-treated plots than in the control
(unsprayed) plots. Tuber biomass accumulation was also significantly affected
by fungicide applications. Varieties Tigoni and Rutuku have relatively higher
levels of polygenic resistance to late blight and showed low levels of disease
severity
Description
Keywords
Tropical Highlands, Fungicide Application, Late-Blight Development
Citation
Olanya, O. M., El-Bedewy, R., Ojiambo, P. S., Ewell, P. T., & Hakiza, J. J. (2001). Relationships of fungicide application to late blight development and potato growth parameters in the tropical highlands of Uganda and Kenya. International Potato Center, 1990-2000.