Two-component insecticides efficiency in cereals during vegetation

Abstract

During vegetation of spring and winter grain cereals the modern two-component insecticides with a high efficiency against the dominant pests have been studied. By spring barley treatment during vegetation against the main phytophages for the period of 2008–2019 the most effective have been the variants with the application of two–component insecticides based on imidaclopride in a combination with the pyrethroid: in reducing stems damage by Frit flies – 80–100 %, against cereal stem flea beetles – 85,7–100 %, against cereal leaf beetle larvae – 83,7–100 %, cereal aphids – 91,4–100 %, ensuring crop productivity increase for 9,8 %. The biological effectiveness of the preparations used on the basis of neonicotinoids and synthetic pyrethroids against cereal leaf beetle larvae has made in winter wheat agrocoenosis – 72.6–100 %, against cereal aphids – 79,6–100 %, keeping by this 1.5–6.9 % of grain yield. During the growing seasons 2017–2019 the combined insecticides have shown high efficiency in reducing cereal leaf beetle larvae number in winter triticale crops for 89,0–99,0 %, winter barley – 89,6–97,5 %, spring wheat – 83,3–100 %, the kept grain yield has made 1,6–8,1 %.