SENSIBILIDADE IN VITRO DE FUNGOS ISOLADOS DE GRÃOS DE MILHO AO FUNGICIDA AZOXISTROBINA + BENZOVINDIFLUPIR EM DIFERENTES CONCENTRAÇÕES

Abstract

Chemical control in applying foliar fungicides is one of the strategies most used for the control of rotting grain and spike caused by fungi of the genus Aspergillus sp., Fusarium spp. and Penicillium sp., among others. In this way this work was to determine in vitro sensitivity of fungi of the genus Penicillium sp., Fusarium spp. and Aspergillus sp. the fungicide Azoxystrobin + Benzovindiflupir in different concentrations the mycelial growth (CM), percentage inhibition of mycelial growth (PICM) and speed index of mycelial growth (MIGS). The sensitivity of fungi to fungicides Benzovindiflupir + Azoxystrobin was tested at concentrations of 10, 50, 100, 500, 1000 ppm (plus control). The experimental design was completely randomized, with four replications. It was observed for mycelial growth, percentage inhibition of mycelial growth and speed index of mycelial growth of fungi of the genus Penicillium sp., Fusarium spp. and Aspergillus sp., a significant difference between the dose of Azoxystrobin + Benzovindiflupir fungicide. The growth of the fungus Penicillium sp., Fusarium spp. and Aspergillus sp., generally is inversely proportional to the concentration of the fungicide used, i.e. the higher the concentration of the fungicide, the lower the mycelial growth. The fungus Aspergillus sp. it was presented the highest mycelial growth inhibition in vitro in Azoxystrobin + Benzovindiflupir fungicide presence that has in its formula one active ingredient belonging to the chemical group of strobilurins. In general, there was a reduction of the average speed rate of mycelial growth of the fungus Penicillium sp., Fusarium spp. and Aspergillus sp. Parallel to the increase of the fungicide concentration.