Herbicide Milagro Plus for Corn Protection against Weeds

In a field experiment conducted in 2022–2024 at the All-Russian Research Institute of Corn in the Stavropol Territory, the effectiveness and phytotoxic effect of the post-emergence herbicide Milagro Plus, MD on hybrids and corn lines was studied. Experimental options: 1 – control without herbicides, 2 – Milagro Plus (1.0 l/ha). The high sensitivity of weeds to the active ingredients of the drug has been established. 21 days after application, 77.0% of weeds died from the action of the Milagro Plus herbicide over an average of 3 years. The decrease in the number of dicotyledonous weeds was 68.6%, monocotyledonous – 88.6%, with a decrease in the above-ground mass by 75.5 and 94.1%. By the end of the growing season, corn control without chemical weed killing was heavily clogged, with an average of 42.3 plants growing per 1 m² in 2022–2024 weeds weighing 960 g/m². In the Milagro Plus herbicide experiment, weed death was 75.4%. The decrease in the number of dicotyledonous plants over an average of 3 years was 76.6%, monocotyledonous – 73.2%. The total vegetative mass of weeds decreased by 92.3% compared to the control, the mass of dicotyledonous weeds decreased by 93.1%, and monocotyledonous weeds decreased by 86.5%. The response of hybrids and lines to the use of the herbicide over the years of the study was mixed. In 2022, lightening of the upper leaves or their bases was noted in the Mashuk 140 hybrid, the maternal form of Alpha M and 4 lines (CL 6M, RD 2144, RG 298 MV, RM 146). In 2023, a greater number of studied hybrids and maize lines showed lightening of the base of the upper leaves, whereas in 2024. No signs of the herbicide’s effects on corn plants have been recorded.