Biological method of protection of apple trees from green apple aphids and apple scab in the conditions of the Pre-Carpathian province of the Carpathian mountain zone of Ukraine

Abstract

Goal. To study the effectiveness of biological preparations to reduce the number and harmfulness of green apple aphids, as well as to reduce the spread and development of apple scab in apple orchards of the Precarpathian province of the Carpathian mountain zone of Ukraine. Methods. Experiments to determine the technical and economic efficiency of biological protection of apple trees, study the phytosanitary status of apple orchards were conducted in 2016—2020 in the apple orchard of the Ukrainian Plant Quarantine Research Station of the Institute of Plant Protection of NAAS on apple orchards in 2005. Accounts for phytophagous population and the presence and development of diseases were carried out according to generally accepted methods in accordance with the phases of the host plant. The effectiveness of insecticides was determined by official methods in 2 and 7 days according to the formula of Henderson and Tilton, the effectiveness of fungicides — in 7 days. Statistical processing of research results was performed by the method of analysis of variance. Plant yield was determined during the third decade of September. Results. The use of the studied bioinsecticides and their mixtures reduced the number of green apple aphids by 61.1—76.8% and provided, in comparison with the control, an increase in the yield of apple orchards by 1.7—1.9 t/ha while improving the marketable quality of fruits. The use of the studied biofungicides and their mixtures allowed to reduce the spread and development of scabies on apple leaves by 66.5—72.5% and on apple fruits by 68.7—73.3%. Due to the use of the studied biofungicides, the yield of orchards was 1.7—2.5 t/ha more than the control and increased the amount of first-class fruit products by 9.5—20.0% compared to the control and reduced the number of non-standard fruits by 11.3—14.8%. Conclusions. Evaluation of the effectiveness of the studied bioinsecticides and biofungicides in apple orchards showed that all drugs allow to effectively control the number of green apple aphids and the spread and development of apple scab in the Precarpathian province of the Carpathian mountain zone of Ukraine.