Efficacy and phytotoxicity of various thiabendazole and tebuconazole ratios in a fungicidal mordant

¹ Russian State Agrarian University-Moscow Timiryazev Agricultural Academy, 127434, 49, Timiryazevskaya Street, Moscow, Russian Federation
² FSAEI HE Volgograd State University, 40006, Universitetsky Ave., 10, Volgograd, Russia
³ FSBEI HE Volgograd State Technical University, 400005, Lenina Ave., 28, Volgograd, Russia

^* Corresponding author: nefedieva@rambler.ru

Abstract

When developing combined preparations, a possible phytotoxic effect should be considered, depending on the dose of the mordant. Fusarium oxysporum and Pyrenophora graminea strains were cultured in a liquid enrichment culture with the addition of fungicides at a concentration of 1.5; 2.5; 3.3 ppm. Wheat grains of the Avesta variety were treated with thiabendazole and tebuconazole in the following doses: 20 g a.d./ t, 30 g a.d./t, 60 g a.d./t, 80 g a.d./t, 100 g a.d./t of grain. The effectiveness of tebuconazole and thiabendazole on mycelium growth slightly depended on their concentration. A.d. mutually reinforced each other. The synergism of the action of two a.d. is revealed. The analysis of variance showed that the effect of tebuconazole was greater than the thiabendazole effect. For both strains, the optimal ratios of tebuconazole and thiabendazole are 1.5:2.5 ppm. The addition of salicylic acid is effective at ratios of 2.5:0 and 2.5:3.3. The mixture of thiabendazole and tebuconazole reduced the germination energy of the grains mainly due to the appearance of abnormal seedlings. A composition of active substances for seed etching is proposed, including the following ratios of components, pts. wt.: tebuconazole 20-100, thiabendazole 20-150.