The paper presents the results of four-ear trials of preparations with silver nanoparticles Zerox,Zeromiks, and Zerebra Agro on varieties with varying degrees of resistance to the main potato diseases. The four-ear trials made it possible to conclude that preparations with silver nanoparticles were effective in protecting potatoes from rhizoctoniosis and alternariosis, comparable to the effectiveness of chemical treaters (Maxim and Celeste Top) and fungicides used in the treatment of vegetative plants (Abiga Peak and Ridomil Gold MC). The biological effectiveness of preparations with silver nanoparticles was lower than that of Abig Peak by an average of 49.8% against late blight on the unstable Ilyinsky variety. The biological effectiveness of Zerebra Agro was low (24.6%) in relation to late blight on the Sante variety in the epiphytotic year. It was high (65.7%) in the non-epiphytotic year, and it was not much worse than chemical fungicides (30.4 and 78.1%, respectively) in both the epiphytotic and non-epiphytotic years.In 2018, when the effectiveness of the preparations was high for all major potato diseases,the yield increase was significantly higher than the check. In the standard version, it exceeded the check by 26.4%, in the variant with Zerebra Agro – by 27.1%. No significant difference was found between the standard variant and Zerebra Agro.

During 2019-2021, the effectiveness of pre-planting treatment of potato tubers of the Sante variety against rhizoctonia disease and two schemes for the use of combined and contact fungicides in the conditions of the Moscow region was evaluated. The biological efficacy of the Idikum preparation for pre-planting treatment of tubers against rhizoctonia disease was 83.5%. All tested potato protection schemes during the growing season showed high efficiency in reducing the prevalence and degree of late blight and alternaria leaf spot. Depending on the prevailing weather conditions of the growing season, the scheme, where the contact-systemic preparation Metaxyl was used for the first treatment, provided an increase in yield by 36.3-47.5%, the second scheme – with the first treatment with the contact preparation Kumir – 25.8-36.3%.

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