​Bioactivating nutritional complex against Asian rust in soybeans

Bioactivating nutritional complex associated with the use of conventional fungicides reduces the severity of Asian Rust by 43,3% and provides an increase in productivity of 4,6 bags per hectare of soybeans in relation to the standard treatment.

The use of Ultrazeb Inox, associated with conventional fungicides, reduced the severity of Asian Rust by 43,3% and increased productivity by 4,6 bags per hectare, in relation to the standard treatment. Productivity losses caused by diseases, combined with the low efficiency of the main chemical groups of fungicides currently used, could slow down the expansion of soybean cultivation in Brazil. Thus, in recent years, interest in alternative management methods has grown. As all methods have limitations, it is necessary to investigate the mode of action of nutritional complexes that bioactivate plant defense, to form part of integrated disease management. In this context, Spraytec developed Ultrazeb Inox, which offers nutrition, greater natural plant defense and better application quality. Very stable and soluble, high-tech and biodegradable formulation that acts on the physiological processes of plants, with positive impacts on productivity. A differentiating characteristic of the product is related to the increased resistance of plants to biotic factors. In response to the application of Ultrazeb Inox, defense mechanisms are activated, inducing the plant to synthesize high concentrations of secondary metabolites, which act as true physical and chemical barriers, hindering the entry and development of pathogens, such as the fungus that causes Asian Rust. . The use of cultivars with high genetic potential associated with sustainable development requires innovative and disruptive products such as Ultrazeb Inox.

Goal

To evaluate the efficiency of the bioactivating nutritional complex Ultrazeb Inox in association with conventional fungicides in the management of Asian Rust in soybean crops.

Material and methods

The experiment was installed in a commercial area, at Fazenda Butiazinho, in the municipality of Pinhão, PR. The soybean cultivar K6221 was used in the test. The experimental design used was randomized blocks, with four replications. The treatments consisted of Control (no application), FAPA Standard (four fungicide applications) and FAPA + Spraytec Standard (four fungicide applications associated with Ultrazeb Inox 0,30 L ha-1). Applications were carried out when the culture was at stages V6, R2, R5.1 and R5.3, respectively. The volume of spray used was 150 L/ha. Evaluations of the product's effectiveness on disease severity and crop yield were carried out. The data were subjected to analysis of variance and the Tukey test (p < 0,05), using the SASM Agri software (Canteri et al..

Results

Ultrazeb Inox demonstrated high synergism with fungicides, increasing effectiveness in the management of Asian Soybean Rust. The association of Ultrazeb Inox with fungicides reduced the severity of the disease. The severity in the control was 85,5%, for the standard treatment it was 17,3% and for the standard associated with Ultrazeb Inox it was 9,8%, that is, a reduction of 43,3% (Figure 1) . Increasing the effectiveness of controlling Asian Rust is extremely important so that there is no loss of the crop's productive potential. In this context, in relation to productivity, the harvest in the control was 38,8, in the standard 73,6 and in the standard plus Ultrazeb Inox 78,2 bags per hectare. The association of Ultrazeb Inox with fungicides promoted an average increase in productivity of 4,6 bags per hectare in relation to the standard treatment (Figure 2). As most conventional chemical fungicides have limitations in control, their association with Ultrazeb Inox has proven to be an effective tool to ensure better management of Asian Rust and consequently, promote greater productivity of soybean crops.

Conclusion

Ultrazeb Inox, in addition to nourishing plants aiming for maximum expression of their productive potential, is a promising alternative in the management of Asian Soybean Rust by inducing plants' defense mechanisms, presenting high synergism with conventional fungicides.

Heraldo R. Feksa, Agricultural Research Foundation (Fapa)