Sensibilidade de Alternaria alternata, agente causal da mancha marrom de alternária a fungicidas do grupo químico das estrobilurinas

Abstract

block design was used, with four replications. The experiments were carried out in duplicates, and the evaluation consisted of determining inhibition of mycelial growth compared to the control. Isolates of A. alternata with EC50 for azoxystrobin and pyraclostrobin greater than 5 or 0.5 µg mL -1 , respectively, were considered resistant. The resistance of all the isolates evaluated was verified. Comparatively, the level of resistance was higher to azoxystrobin, with mycelial growth even at 100 µg mL -1 .