Avaliação de nova tecnologia no controle de doenças na cultura da soja

Abstract

The soybean production, despite its high productivity, presents some obstacles that limit the productive efficiency of the crop, mainly factors related to diseases. In this context, the present study aimed to evaluate the efficiency of a new product in the control of anthracnose (Colletotrichum truncatum), target spot (Corynespora cassiicola) and mildew (Peronospora manshurica) in soybean crop [Glycine max (L.) Merrill]. The experiment was conducted in Sinop - MT. The experimental design was randomized blocks, with 10 treatments and 5 replicates, cultivar Monsoy 8372 IPRO. The experiment was tested in two different circumstances, being these in an isolated manner with doses of 70, 140, 210 and 280 g.ha-1, besides the control treatment, and, combined with commercial fungicide with the same dosages used in the isolated treatments (70, 140, 210 and 280 g.ha-1,besides the control treatment). The product was applied at three plant stages (V5, R1 and R5). For the control of mildew (P. manshurica), number of pods.m² and defoliation treatment with 280 g.ha-1 combined with standard fungicide presented the best results. The dosage of 210 g.ha-1 of the standard tested fungicide combined property technology was efficient in the control of target spot (C. cassiicola). The application of 280 g.ha-1of the product reduced the number of pods with anthracnose. The dosage of 140 g.ha-1 combined with fungicide proved to be efficient for improvements in the weight of a thousand grains. No significant effects were observed for control of anthracnose (C. truncatum), phytotechnical parameters, as well as productivity (sc.ha-1).