Phytophthora disease of Solanum lycopersicum L. is one of the most widespread and economically damaging diseases of the tomato plant. Under the influence of the disease, productivity can decrease up to 10-50%, and in epiphytotia up to 100%. The disease begins during flowering and damages the leaves, stems and fruits of the plant. This article presents the results of our research on the application of Vinkozeb 80% w.p. fungicide against phytophthora disease of tomatoes in the open field.