The present study aimed to evaluate the effect of seed treatment associated with foliar spray to control soybean asian rust. The experiment was carried out at the experimental station of Emater, Senador Canedo Municipality, Goiás State, Brazil. Experimental design was in randomized blocks, in (3x2x2) factorial arrangement, with 4 replicates. Two triazole fungicides were evaluated for seed treatment: fluquinconazole and flutriafol, in two soybean cultivars, BRS Valiosa RR and Emgopa 315 RR, complemented with leaf spray of fungicide azoxystrobin + cyproconazol and nimbus. Analysis of variance was done for all evaluated parameters, and means were compared using Tukey's test at 5% probability. Seed treatment with fluquinconazol and flutriafol did not affect the final stand for any of the analyzed cultivars. At 65 days after sowing, Emgopa 315 RR cultivar had lower incidence of rust. Fluquinconazole and flutriafol also promoted lower incidence and severity of this disease. Emgopa 315 RR had less defoliation than BRS Valiosa RR at the evaluation date. Seed treatment with fungicides promoted less defoliation, compared to untreated seeds, in BRS Valiosa RR cultivar. For Emgopa 315 RR, however, this fact was not detected. Seed treatment with fungicides can be a useful tool for the management of soybean Asian rust, although this techinique of applying fungicides no influence on yield of transgenic soybean.
Glycine max; Phakopsora pachyrhizi; management; triazole
