8/7/2023 0 Comments Late blight of potato disease![]() ![]() Number of hours with average RH 27 C) in 24 hour periods Only count hours that co-occur with 10 or more consecutive hours at RH>=90% or rain>=0.1ĭo not consider RH or rain, add 7.5479 to the product of r x h Only count hours that co-occur with 4 or more consecutive hours at RH>=90% or rain>=0.1 mm/hr RH or Precipitation Requirements, or other conditions to be met Number of hours hourly temperature averages are in this range (h), or other conditions to be met Daily and accumulated risk values over a week are calculated starting at crop emergence. It has been used in Germany to predict the timing of Late blight (Phytophthora infestans) epidemics are not likely to occur. This "negative prognosis" model uses measurements of temperature, relative humidity, and rainfall to predict when Input variablesĮnvironmental: Hourly temperature, relative humidity, and rainfall.Ĭalculated: Number of hours that fit pre-defined environmental conditions, risk values, and accumulated The model was developed with temperature sensors mounted 2 meters above the ground. Pflanzenschutzdienst (Braunschweig) 18:33-40. ((Phytophthorainfestans) und die moglichkeit seiner losung durch eine negativprognose. Das problem der vorhersage des aufretens der kartoffelkrautfaule This model has been implemented in Europe. Is being validated by Adcon Telemetry and the California Tomato Research Institute in northern California. This model has been validated in Denmark, Norway, and Sweden in 19 for late blight of potato. Blight units and rainfall value is set to zero after each fungicide Or 50 (moderately resistant cultivar) has been exceeded. ![]() Value of the previous night is 8, and a blight unit threshold of 40 (susceptible cultivar), 45 (moderately susceptible cultivar) Subsequent treatments should be done when accumulated rainfall is greater than 20 mm or risk Action thresholdįungicide sprays are started when the accumulated risk value is greater than 160, and the risk value for the All parameters in the model are saved in a setup file and can be changed by the user. First fungicide application is recommended onceĪccumulated risk values exceed 160 and the daily risk value, calculated according to the "negative prognosis" model, is above 8.Īfter the initial spray, favorable weather for disease development is expressed as blight units according to the method of FryĮt al. Was based on biological and meteorological data obtained from Foulom, DK. (1983) to time subsequent fungicide applications during the season. Ullrich and Schrodter (1966) to forecast risk of late blight outbreak on potato, and the model ofįry et al. It uses the "negative prognosis" model of NEGFRY is a personal computer-based model developed in Denmark. Sensor locationĮnvironmental: Hourly temperature, relative humidity, and rainfall. Of potato blight in Ireland and the subsequent famine. Held in Trinity College, Dublin, Ireland, September 1995 to mark the one hundred and fiftieth anniversary of the first record In: Phytophthora infestans 150: European Association for Potato Research (EAPR)-Pathology Section Conference, NEGFRY- A system for scheduling chemical control of lateīlight in potatoes. Tested for one or more seasons under local conditions to verify that it will work in the desired location. Note: Before using a model that was not field tested or validated for a specific location, the model should be Printer-friendly version Research and IPM Models: Diseases | More disease models ![]()
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