Study of the effectiveness of thiencarbazone-methyl against wild oat Avena fatua in spring wheat

Trials to determine the effectiveness of the thiencarbazone-methyl on wild oat (Avena fatua L.) were conducted in 2013 and 2014. The experiments were carried out on spring wheat in Sverdlovsk, Kurgan and Altai regions in accordance with the requirements of the “Guidelines for field test of herbicides in crop production» (1981) and «Guidelines for registration trials of herbicides in agriculture» (2013). According to results, the use of thiencarbazone-methyl (5–10 g a.i./ha) on spring wheat crops allows to reduce Avena fatua plants by more than 70 %. Wild oat control is possible in a wide range from the earliest phases (sprouting weeds) to late phase (booting). At the same time, the application rates of thiencarbazone-methyl for later treatments should be increased to 10 g a.i./ha, which allows achieving 100 % efficiency. Eliminating competition from weeds after thiencarbazone-methyl treatment makes it possible to harvest additionally up to 6.9 centner/ha of spring wheat.