The relationship of leaf wetness duration and disease progress of glume blotch,caused byStagonospora nodorum,in winter wheat to standard weather data |
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Authors: | A Djurle B Ekbom J E Yuen |
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Institution: | (1) Department of Plant Pathology, Swedish University of Agricultural Sciences, P.O. Box 7044, S-750 07 Uppsala, Sweden;(2) Department of Entomology, Swedish University of Agricultural Sciences, P.O. Box 7044, S-750 07 Uppsala, Sweden;(3) Department of Cancer Epidemiology, Uppsala University, University Hospital, S-751 85 Uppsala, Sweden |
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Abstract: | Almost 50% of the variation in leaf wetness duration can be explained by maximum and minimum temperatures, rainfall and hours with relative humidity above 90% on a daily basis. All of these parameters can be estimated from a standard weather station. If variables related to wind are added the level of explanation increases to 69–76%. Leaf wetness duration explained up to 42% of the rate of disease increase (RDI) forS. nodorum. Leaf wetness duration was accumulated over a 5-day window period and correlated with rate of disease increase after a 7-day lag period. Standard weather variables could explain 20–34% of the disease increase. The relevance of these statistical models to disease prediction is discussed. |
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Keywords: | epidemiology Septoria nodorum |
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