Аннотация:Potato is one of the most important food products in Russia. Causal agents of various potato diseases represent a significant factor reducing the productivity and quality of potato. A new version of the VNIIFBlight DSS has been designed to control both late and early blights of potato. This DSS uses combined information about the local climatic conditions, weather forecast, plant growth stage, disease resistance of potato cultivars, and fungicide characteristics. Depending on the combination of all these factors, one of three possible recommendations is proposed “Fungicide spraying is not required now”, “The further fungicide spraying will be inefficient”, “Fungicide spraying should be done” (with the indication of the list of fungicides which are the most suitable at this moment). In 2017, the field trials of a commercial online service to control the late and early blight of potato using this DSS version started at six potato farms located in the Moscow, Bryansk, Lipetsk, Belgorod, and Samara regions of Russia.