Predicting favorable conditions for early leaf spot of peanut using output from the Weather Research and Forecasting (WRF) model |
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Authors: | Rabiu O Olatinwo Thara V Prabha Joel O Paz Gerrit Hoogenboom |
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Institution: | (1) Department of Biological and Agricultural Engineering University of Georgia, University of Georgia, Griffin, GA 30223, USA;(2) Indian Institute of Tropical Meteorology (IITM), Pune-8, India;(3) Department of Agricultural and Biological Engineering, Mississippi State University, Box 9632, Starkville, MS 39762, USA;(4) Washington State University, 24106 North Bunn Road, Prosser, Washington, DC 99350-8694, USA |
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Abstract: | Early leaf spot of peanut (Arachis hypogaea L.), a disease caused by Cercospora arachidicola S. Hori, is responsible for an annual crop loss of several million dollars in the southeastern United States alone. The development
of early leaf spot on peanut and subsequent spread of the spores of C. arachidicola relies on favorable weather conditions. Accurate spatio-temporal weather information is crucial for monitoring the progression
of favorable conditions and determining the potential threat of the disease. Therefore, the development of a prediction model
for mitigating the risk of early leaf spot in peanut production is important. The specific objective of this study was to
demonstrate the application of the high-resolution Weather Research and Forecasting (WRF) model for management of early leaf
spot in peanut. We coupled high-resolution weather output of the WRF, i.e. relative humidity and temperature, with the Oklahoma
peanut leaf spot advisory model in predicting favorable conditions for early leaf spot infection over Georgia in 2007. Results
showed a more favorable infection condition in the southeastern coastline of Georgia where the infection threshold were met
sooner compared to the southwestern and central part of Georgia where the disease risk was lower. A newly introduced infection
threat index indicates that the leaf spot threat threshold was met sooner at Alma, GA, compared to Tifton and Cordele, GA.
The short-term prediction of weather parameters and their use in the management of peanut diseases is a viable and promising
technique, which could help growers make accurate management decisions, and lower disease impact through optimum timing of
fungicide applications. |
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