SEVERIDADE FITOSSANITÁRIA DE CULTIVARES DE SOJA (Glycine max) DE CICLO LONGO E SUA RELAÇÃO COMO CRITÉRIOS MORFOAGRONÔMICOS

Abstract

Abstract: Due to the probability and time of exposure in the environment, regardless of host resistance, the cultivation time (phenological stage) may be related to the incidence of pest complexes and diseases. The objective of this work was to evaluate the incidence of phytosanitary complexes in late soybean cultivars and to verify the influence on morphoagronomic parameters. In the 2017 crop, 24 cultivars (treatments) were cultivated in four blocks. Three evaluations were performed at 89 days after planting (DAP), 110 and 117 DAP of the phytosanitary severity (SF,%), in ten leaves below the middle third, and the identification of the causal agent associated to SF, organized in the form of a binary matrix (0 and 1). Morphoagronomic parameters were evaluated to correlate with sanitary parameters. The dependent variables were evaluated using ANOVA and Skott Knott, followed by F and LSD tests, and multivariate analyzes. The cultivars Bonus 7.9, XI 811659 Ipro, XI 781668 and XI 781513 B showed the lowest AACPFPlan and TIPlan. The cultivar NS 7505 Ipro that presented lower phytosanitary severity in the leaves and plant showed the highest HP and HIPN. The cultivar M 7739 Ipro was only highlighted in the morphoagronomic parameters because it possesses a greater mass of 100 grains. The recognition of cultivars that differentially support the attack of agent complexes is an important phytosanitary management strategy.