Controle químico e biológico da ferrugem asiática da soja

Abstract

Soy (Glycine max) is the main cut crop in Brazil and with great expansion of its cultivation, arising phytosanitary problems, and with Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, it is one of the most serious diseases that affect the soybean crop with damage ranging from 10 to 90%, due to a political resource of disease and difficulty in control. Therefore, the objective was to evaluate the calendar control of chemical and biological products in Asian soybean rust, leading to two sowing dates. The experiment was installed in two sowing dates under field conditions at the Experimental Farm of Agricultural Sciences at UFGD. The experimental design was in randomized blocks, with nine treatments and four replications. The first and second occurrences were sown on 10/29/18 and 11/20/18, respectively. For embassies such as sowing times, the same effects were used. In addition to the chemical products, two biological products composed of Bacillus sp., And a control treated with water were also used. The products were used on a scheduled basis. The variables evaluated were: The Area Below the Disease Progress Curve, number of plants per plant, number of grains per plant, mass of grains and grains. In the first sowing period, there was low inoculum pressure, obtaining a greater increase in grains in use 2 (Azoxystrobin Benzovindiflupir, Difenoconazol / Ciproconazol, Chlorothalonil), treatment 3 (Azoxystrobin / Benzovindiflupir, Bacillus spp., Difenoconazol / Ciproconifolol / 5 / tren bixafen Trifloxystrobin / Ciproconazole, Mancozeb) and treatment 7 (Bacillus spp. + Copper phosphite), in the second sowing phase with a higher frequency of disease, and all individuals have physical effects in reducing severity in relation to the same age. . The efficiency of the FAS control with fungicides, cannot result in reproduction gain, when the climatic conditions are more adverse, during the growth and development of the soybean.