Chemical Control of Insect Pests by Reduced Doses and Effect on Leaf Components in Alfalfa (Medicago sativa L.) | Asian Journal of Research and Review in Agriculture

Control insect pests in modern agroecosystems are essential for the environment and biodiversity. In this regard, the aim of the study was to determine the effects of Biscaya (thiacloprid 240 g/L), applied alone and with 1/5 and 2/5 reduced doses in a mix with the mineral oil Akarzine on pea aphid, Acyrthosiphon pisum Harr. and alfalfa plant bug, Adelphocoris lineolatus Goeze mortality, plastid pigments and total nitrogen content on alfalfa plants. It was found that mineral oil Akarzine exhibited an insecticidal effect from the first to the seventh day, including after treatment. Akarzine, combined with 1/5 and 2/5 reduced doses of Biscaya, helped to prolong the toxic action of the insecticide and provided a significantly lower density of pea aphid and alfalfa plant bug. Factor days after treatment had a dominant influence and a significant effect on the efficacy - 66.5%. The total pigment content in leaves was statistically reduced after the treatments except for combined Biscaya in the 2/5 reduced dose and Akarzine. The combination retained the green and yellow pigments, did not reduce the photosynthesis efficiency of the plant. The use of Akarzine with Biscaya in 1/5 reduced dose led to the highest nitrogen fixation in alfalfa. The mixture of Acarzine and Biscaya in 1/5 reduced dose was marked by a high protective effect against insect pests, good physiological state of the plants, improved photosynthesis and high nitrogen content

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