Programas de fungicidas no controle de doenças foliares em soja - safra 2018/2019

Abstract

Soybean is a very important economic and social crop in the world, consisting of one of the largest crops produced during the harvest period in Brazil. The control of diseases in the crop presents new challenges with each harvest, due to the increase in disease severity, resistance to chemical products and the emergence of new diseases. Thus, the objective was to evaluate the efficiency of technologies in disease control, and the effect of productivity on soybean (Glycine max (L.) Merrill) yield. The experiment was conducted during the 2018/2019 Crop in Claudia, Mato Grosso. The statistical design used was randomized blocks, with 09 treatments and 04 repetitions, with cultivar NS7901. The treatments performed were: T1- Control treatment (Control without application); T2- Picoxystrobin 200 g/L and Cyproconazole 80 g/L (VN – last node before flowering), Benzovindiflupir 50 g/L and Picoxystrobin 100 g/L (VN+15 and VN+29), Picoxystrobin 200 g/L and Cyproconazole 80 g/L (VN+43); T3- Benzovindiflupir 50 g/L and Picoxystrobin 100 g/L (VN+15 and VN+29), Picoxystrobin 200 g/L and Cyproconazole (VN+43); T4- Propiconazol 250 and g/L Difenoconazol 250 g/L (VN), Azoxystrobin 100 g/L and Benzovindiflupir (VN+15) Azoxystrobin 200 g/L and Cyproconazol 80 g/L (VN+29 and VN+43); T5- Azoxystrobin 100 g/L and Benzovindiflupyr (VN+15) Azoxystrobin 200 g/L and Cyproconazol 80 g/L (VN+29 and VN+43); T6 Fox® (VN), Benzovindiflupir 50 g/L and Picoxystrobin 100 g/L (VN+15), Fox® (VN+29), Trifloxystrobin 375 g/L and Cyproconazole 160 g/L (VN+43); T7- Benzovindiflupir 50 g/L and Picoxystrobin 100 g/L (VN+15), Trifloxystrobin 150 g/L and Prothioconazol 175 g/L (VN+29), Trifloxystrobin 375 g/L and Cyproconazole 160 g/L (VN+ 43); T8- Fluxapyroxade 167 g/L and Pyrclostrobin 333 g/L) SC (VN), Azoxystrobin 100 g/L and Benzovindiflupir (VN+15), Picoxystrobin 200 g/L and Cyproconazole 80 g/L (VN+29), Trifloxystrobin 375 g/L and Cyproconazole 160 g/L (VN+43); T9- Azoxystrobin 100 g/L and Benzovindiflupyr (VN+15), Picoxystrobin 200 g/L and Cyproconazole 80 g/L (VN+29),Trifloxystrobin 375 g/L and Cyproconazole 160 g/L (VN+43). Through the analysis of the results of this experiment it was concluded that there was no significant difference in the control of Anthracnose (Colletotrichum spp.), Target Spot (Corynespora cassiicola), Septoria (Septoria glycines) and Frog's Eye (Cercospora sojina). Only in the control of downy mildew (Peronospora manshurica) there was a significant difference in relation to AUDPC. In relation to the mass (g) of a thousand grains there was a difference, showing that with only three applications, a greater mass was obtained. There was no difference between the treatments in the productivity parameters (kg/ha), however, treatment 9 had the highest productivity, with 3946.51 kg, or 65.78 bags, this treatment with three applications, with greater efficiency in the control of Target Spot (C. cassiicola), which is the most harmful disease among those found and 26.16%. of efficiency in the control of Anthracnose (Colletotrichum spp.).