Efeito de indutor de resistência no controle de doenças foliares e na produtividade da cultura da soja

Abstract

With great economic and social importance in Brazil, soybean is one of the main crops produced during the harvest period. In Brazil, more than 40 diseases caused by bacteria, viruses, nematodes and fungi have been identified, a number that continues to increase with the expansion and intensification of agriculture in the country. With the objective of avaluating the efficiency of the Inducer in the aid of disease control in the soybeans (Glycine max (L.) Merril) crop productivity, an experiment was conduced at an experimental area during the 2017/2018 harvest, at Sinop, Mato Grosso. The statistical design used was the randomized blocks, with seven treatments and five replications, with the cultivar M8372 IPRO. The Inducer was applied in association with the fungicides Vessarya® (Benzovindiflupir 50g/L + Picoxistrobina 100g/L) and Orkestra® (Piraclostrobina 333g/L + Fluxapiroxade 167g/L), at the V8 growth stages, R1(Beginning flowering), R1+16 days and R1+34 days. The fungicide Vessarya® in conjunction with Inducer at the treatments five (INDUCER (V6/V8) Vessarya®+INDUCER (R1) Vessarya® (R1+16 e R1+34) and seven (INDUCER+Vessarya® (V6/V8 e R1) Vessarya® (R1+16)), provided a control of 40% in the Target Spot (Corynespora cassiicola), with the application performed on V8, independent of the aplication in R1+34. There was no estatistical difference in Anthracnose (Colletotrichum truncatum), or Downy mildew (Peronospora manshurica) control. In relation of the number of pods/plant; grain number/plant; 4, 3, 2 and 1 grains pods; mass of a Thousand grains and productivity (Kg/ha), there was no significant difference between the treatments in the test performed.The treatments that used INDUCER at the vegetative stage were the ones that presented lower area below disease progress curva, wich could have influenced the resistance of the plants to phytopathogens.