SENSITIVITY OF Aspergillus sp. And Fusarium sp. TO DIFFERENT CONCENTRATIONS OF FUNGICIDES

Abstract

The application of fungicides is the main strategy to control diseases related to grains and corn on the cob crop. However, over the last few years there has been noticed a development of greater resistance of fungi to chemical molecules. This has allowed for the development of new forms of control, when the species resistant to this product are determined in vitro. The objective of this study was to evaluate the in vitro sensitivity of the fungi Aspergillus sp. and Fusarium sp. to different fungicides. The fungicides Epoxiconazole + Piraclostrobin, Ciproconazol + Picoxystrobin and Fluxapiroxade + Piraclostrobinal were evaluated at concentrations of 0, 10, 50, 100, 500, 1000 ppm, under a completely randomized design, in a factorial arrangement, with four replications. The percentage of mycelial growth inhibition, the rate of mycelial growth rate and the concentration of each fungicide capable of inhibiting 50% of mycelial growth (IC50) were determined. In general, the higher the concentration of the fungicide used, the greater the percentage of inhibition and the lowest average rate of mycelial growth of the fungi Aspergillus sp. and Fusarium sp. For the fungus Aspergillus sp., the fungicide Fluxapiroxade + Piraclostrobina provided the lowest mycelial growth with the IC50 of 39.78 ppm. For the fungus Fusarium sp., the lowest mycelial growth was observed with the fungicide Epoxiconazole + Pyraclostrobin in the IC50 of 25.56 ppm. sp