Effects of application rate on spray deposition, stink bug control, and yield in soybean crops

Made available in DSpace on 2022-05-01T08:44:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-02-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Stink bugs are economically important pests in soybean crops, affecting yield as well as the physiological and sanitary quality of grains or seeds. The present study aimed to assess the spray deposition into soybean canopy, stink bug control, and soybean yield as affected by insecticide application rate. Field experiments were carried out evaluating the variations of 60, 110, 160 and 210 L ha−1 application rates in two seasons. The spray deposition on soybean leaves taken from the bottom, middle and top canopy sections was quantified using Brilliant Blue marker dye. The efficacy of the application rate treatments applied with insecticides was determined based on stink bug control and soybean yield. In general, the amount of spray deposit on soybean sections and plant canopy had little difference regardless of the spray volume. The control of stink bugs showed only a significant difference between the treatments that received insecticide when compared to the control treatment, regardless of the application rate. In two soybean seasons, yield was reduced by stink bug infestation in the control treatment. Department of Plant Production Sao Paulo State University, SP Department of Plant Protection Sao Paulo State University, SP Researcher at AgroEfetiva, SP Department of Agrarian Science Federal University of Sao Carlos, SP Department of Agrarian Science Maringa State University, PR Sao Paulo State University, SP Department of Plant Production Sao Paulo State University, SP Department of Plant Protection Sao Paulo State University, SP Sao Paulo State University, SP FAPESP: 2019/00533-5