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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/643

Title: Yield losses caused by late blight (Phytophthora infestans (Mont.) de Bary) in potato crops in Ireland
Authors: Dowley, L.J.
Grant, Jim
Griffin, D.
Keywords: Late blight
Phytophthora infestans
Issue Date: 2008
Publisher: Teagasc, Oak Park, Carlow, Ireland
Citation: L.J. Dowley, J. Grant and D. Griffin. Yield losses caused by late blight (Phytophthora infestans (Mont.) de Bary) in potato crops in Ireland. Irish Journal of Agricultural and Food Research 47: 69–78, 2008
Series/Report no.: Irish Journal of Agricultural and Food Research;vol 47
Abstract: Field experiments, using foliage blight susceptible cultivars, were conducted at Oak Park, Carlow from 1983 to 2007 to determine the loss in potato production caused by crop infection with Phytophthora infestans. In each of the 25 years an untreated control was compared with protectant and with systemic fungicide programmes to determine the effect of late blight on the defoliation percentage at the end of the season, the area under the disease progress curve, marketable tuber yield, total tuber yield and yield of blighted tubers. The earliest date of first recorded late blight was 22 June and the latest was 15 September, but in 15 of the 25 years, blight was first recorded between 17 July and 13 August. Disease reached epidemic proportions in all but 4 of the years. Yields varied considerably among years. The mean loss in total yield from not using a fungicide was 10.1 t/ha. Differences in yield were significant across the 25 seasons. No overall increase in aggressiveness of the pathogen could be detected over the 25-year period.
Description: peer-reviewed
URI: http://hdl.handle.net/11019/643
ISSN: 0791-6833
Appears in Collections:IJAFR volume 47, 2008

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