This experiment aimed to evaluate the iprodione effects on mycelial growth of
fungi commonly associated with rice seeds in the state of Minas Gerais, Brazil. Isolates of Alternaria
alternata, Aspergillus flavus, Aspergillus niger, Aspergillus ochraceus, Curvularia oryzae,
Drechslera oryzae, Gerlachia oryzae, Phoma sorghina and Pyricularia grisea were obtained
from rice seeds and mycelial growth measured in PDA medium containing the fungicide at
concentrations of 10mg.l-1, 50mg.l-1, 100mg.l-1 and 500mg.l-1, after seven days of incubation. The
effect of iprodione was evaluated by calculating ED50 (dose required for inhibiting 50% of the
mycelial growth). Iprodione inhibits with high effect (ED50 < 10mg.l-1) the mycelial growth of the
fungi A. alternata, A. flavus, A. niger, A. ochraceus, C. oryzae, D. oryzae and G. oryzae, medium
effect (ED50 = 10-50mg.l-1) P. sorghina and low effect (ED50 > 50mg.l-1) the mycelial growth of P.
grisea. The fungi A. niger and A. ochraceus were the most sensitive ones to the fungicide tested
with ED50 of 2,5 e 3,1mg.l-1, respectively.