Application of fungicides when growing tomato in the Astrakhan region

In recent years the most of tomato seeds are imported from abroad, and they are not always of a good quality. The goal of our research was to select modern chemicals that provide the minimum pesticidal force, but give the maximum protective effect against the most common disease of tomatoes. The task of the research was to determine the most effective combination and study of the impact of fungicides on the development of Alternaria blight on tomato. The research was carried out in 2016-2018 years in the fields of OOO “Nadezhda-2”, Kamyzyakskiy district of the Astrakhan region. The article describes the main disease of tomato which bears significant losses of yields - Alternaria blight, and indicates two forms of the disease excitant. There are provided a description of the variety on which the research was conducted, the scheme of trial of the fungicides study, their active substance, rates and frequency of application, and the hydraulic fluid consumption; methods are indicated. The article presents the results of the research of the impact of fungicides on the distribution and development of the disease; it shows their biological effectiveness in the flowering phase of 2-3 tomato trusses, in the fruit filling phase and during the period of fruits ripening of 1 truss. It has been established that when growing seed tomatoes in the Astrakhan region, the use of modern fungicides significantly keeps the development of Alternaria blight, increases the crop yielding capacity by 28,435,4% and reduces the number of diseased fruits by 1,7-2 times. The most effective against Alternaria is the two-fold spraying of plants with the fungicide Bravo, KS (by 3,0 l/ha) and the third treatment with Kvadris, SK, (by 0,5 l/ha) or the twofold spraying of plants with fungicide Ridomil Gold MC, WDG (by 2,5 kg/ha) and the third treatment with Bravo, KS (by 3,0 l/ha).

томат, альтернариоз, развитие и распространение заболевания, фунгицид, биологическая эффективность, урожайность, tomato (Lycopersicum), Alternaria blight, development and distribution of the disease, fungicide, biological efficiency, yielding capacity