Abstract
Purpose. To study the effectiveness of chemical weed control for winter wheat crops with the use of formulations based on sulfonylureas.
 Methods. Field and laboratory.
 Results. The use of Logran 75WG formulation in autumn allowed to reach weed control efficiency at the level of 71.2–87.2 % for use in the BBCH 10–13 development stage of wheat plants and 67.0–83.2 % for application in the BBCH 22–25 stage. However, herbicide Logran 75 WG at a high application rate (15 g/ha) allowed to effectively control such species as Chenopodium album, Polygonum convolvulus, Persicaria maculosa, Viola avrensis, Sinapis avrensis and Solanum nigrum in the BBCH 10–13 development stage of winter wheat and similar species in the BBCH 22–25 stage with a destruction efficiency of 89.0–100 %. Autumn application of herbicide PIK 75 WG in the BBCH 7–9 stage allowed to effectively control dicotyledonous weeds due to the soil action of the formulation. Thus, at the application rate of 20 g/ha, the overall efficiency of the formulation was 88.2 %, but for the application of 30 g/ha it was 96.7%. It is investigated that the use of Logran 75 WG in spring allowed to obtain weed control efficiency at the level of 60.9–77.2 % for use in the development stage of wheat plants BBCH 27–29 and 53.5–69.8 % for application in the BBCH 30–35 stage. Spring application of herbicide PIK 75 WG in the BBCH 25–26 stage allowed to effectively control dicotyledonous weeds due to long-term soil action of the formulation. Thus, at the application rate of 20 g/ha, the overall efficiency of the formulation was 75.1 %, but for the application of 30 g/ha it was 90.9 %.
 Conclusions. It was found that spring application of herbicides to control weeds in winter wheat crops was less efficient, since perennial species had time to form a strong root system, which is resistant to the action of the formulation based on sulfonylureas. Wintering weed species continue their vegetation. Seeds of such species as Polygonum spp., Thlapsi avrense, Viola avrensis, Galium aparine, Sinapis avrensis, and others germinate in the early stages.
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