Efficiency of potato late blight control models
2002
Bimsteine, G. | Turka, I. (Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Plant Biology and Protection)
Weather conditions in Latvia almost every year affect the development of potato late blight caused by Phytophthora infestans (Mont) de Bary. There is a standardised technology that is mainly used for the control of potato late blight in Latvia. The first field treatment was made during the row closing. The regular treatments were made each 7 to 14 days. The use of potato late blight forecasting model NegFry started in Latvia in 1998. The model is based on simulation studies with historical meteorological data. NegFry recommends the data of the first treatment and consecutive spraying intervals because it prognoses the time without risk of potato late blight. Local varieties and weather data have been use in the trial. Standardised fungicide application was compared with NegFry model and untreated version for potato late blight control in field trials. The major task of model usage is the possibility to reduce number of fungicide treatments. In 2001, compare to 2000, the reduction of treatment index was 60 % in some places. There was a significant difference in tuber blight between standardised fungicide application and recommendations by NegFry and between years.
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