Primorsky krai is located in a monsoon climate with an annual rainfall of 700–800 mm, most of which falls in the summer. Since most of the precipitation occurs in the summer, this, in combination with elevated air temperatures during the growing season, creates favorable conditions for the development of diseases of vegetable crops. In these conditions, the leaf surface of tomato plants is affected by phytopathogens from the genera Phytophthora, Alternaria, Septoria and Xanthomonas. In years favorable for the development of diseases, tomato crop losses reach 60% or more. In this regard, research on the dynamics of tomato diseases in the open ground and the effectiveness of protective measures to combat them are relevant. To determine the effectiveness of the recommended system for protecting zoned tomato varieties with different biological developmental features from diseases in a monsoon climate. The studies were conducted in 2022, 2023 and 2024 at the Primorsky Vegetable Experimental Station on tomato varieties of its selection – Odyssey and Fitilyok. Orvego and Signum fungicides were used for protective measures. The first drug treatment was carried out after the first signs of alternariasis appeared on the tomato leaf surface (at the end of the first and beginning of the second decade of July). Two subsequent treatments were carried out with an interval of 11–14 days, depending on weather conditions. The damage to the leaf surface of plants was assessed in dynamics on a five-point scale. Crop counts were carried out by the weight method, starting from the second half of August. Differences in the dynamics of the intensity of alternariasis development of the analyzed varieties are noted. Damage to plants by leaf spots caused by pathogens of alternariasis, as well as septoria, leads to a decrease in the overall yield of tomato varieties. However, no damage to the fruits by these diseases was noted. The decrease in the marketability of products is mainly due to the development of late blight. The use of triple treatment of plants with a tank mixture of two preparations with different fungicidal activity against pathogens of alternariasis and late blight gives a significant positive effect, increasing the overall, early and commercial yield of tomatoes by two or more times.

Vanyushkina Irina A., Sinichenko Natalya A., Kozar Elena G., Pyshnaya Olga N.

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