New combined herbicide Cornegy for protecting corn crops

The aim of the work was to study biological and economic efficiency of new combined herbicide Cornegy, SE by JSC "Shchelkovo Agrokhim" on corn crops in Krasnodar Region. The objective of the study was to determine the spectrum of herbicidal activity the Cornegy, SE preparation on the species composition of annual dicotyledonous and cereal weeds in corn crops. The experiments were carried out on a stationary crop rotation of the All-Russian Research Institute of Biological Plant Protection in 2017-2018 according to the guidelines for the registration testing of herbicides in farming. The soil of the experimental plot was leached chernozem, low-humus, heavy-duty. The area of the experimental plots was 25 m2, there were four replications, and the rate of the working fluid consumption was 200 l/hectare. Experimental scheme included the tested herbicide Cornegy, SE at application rates of 1.5-2.0 l/hectare, Lumax standard, SE (3.0 and 4.0 l/hectare) and the option without treatment (control). The treatment was carried out in the phase of 3-5 leaves of the crop. The weediness of corn crops averaged 75 ind/m2. Herbicidal effect of the preparations was assessed by the decrease in the number and weight of weeds, as well as by the crop yield in comparison with the control (without herbicide treatment). The weeds: barnyard grass, ragweed, redroot amaranth, pigweed and California cocklebur showed high sensitivity to the preparations. Using 1.5-2.0 l/hectare of Cornegy, SE resulted in 90-100 % herbicidal effect. No negative effect on corn was noted, the crop yield increases were obtained, which amounted to 171.5-174.4 % to the control (without herbicides). The standard for herbicidal activity on the cereals was inferior to the tested preparation. The data obtained over two years showed high biological and economic efficiency of the herbicide Cornegy, SE against annual dicotyledonous and cereal weeds in corn crops.