Fungicides using against late blight of tomatoes in the conditions of Topkinsky district of Kemerovo region
The article presents the results of field experiments in 2018-2019 on the influence of fungicides on the spread of late blight on tomatoes in the soil and climatic conditions of Topkinsky district of Kemerovo region. A comparative assessment of a broad-spectrum copper-containing fungicide Abiga-Peak and a contact-systemic fungicide Profit gold effect on five varieties of salad tomato and a universal one included in the state register for growing in the open ground, such as Volgogradets, Novichok, Novichok pink, Demidov and Denezhny meshok. The calculation of biological effectiveness of drugs is given under favorable conditions for growing tomatoes and forming high-quality fruits during the growing season 20182019. During 2018, the average monthly air temperatures 1.1-1.2 times exceeded average annual ones, in 2019, the average monthly air temperatures did not differ from average annual ones, and the amount of precipitation was uniform in both years of research. The comparative assessment showed that the lowest rates of late blight spread were found in the Moneybag (8.9%) and Novichok (10.7%) varieties using the Abiga-peak fungicide, and in the Moneybag (7.1%) and Demidov (9.8%) varieties using the Profit gold fungicide. The used fungicides were able to stop the intensity of late blight spread by 10-20% compared to the control variant. The calculation of biological effectiveness of the preparations showed that the best results were for the Profit gold fungicide on the Moneybag variety (64.3%) at the time of liquid harvest, and for the Abiga-Peakfungicide on the Novichok variety, showing a biological efficiency of 60.7%.