Inhibition and stimulation of mycelial growth of Moniliophthora roreri by flutolanil in populations of Ecuador

Frosty pod rot (FPR) of cacao is caused by Moniliophthora roreri (MR). Effective management must include chemical or biological control, in addition to agronomic tactics. Flutolanil has been effective controlling FPR. The objective this research was determine the response flutolanil MR isolates from Amazon and Coast regions Ecuador. Percentage mycelial growth inhibition (PGI), medium inhibitory concentration (IC50) against three concentrations fungicide were determined. One µg mL-1 culture inhibited completely 76 isolates. At 0.1 μg mL-1, 74/76 between 70-97 % compared control. Conversely, at lower (0.01-0.001 mL-1) results only 22 47 %, respectively. Four groups identified: one included most sensitive (66/76) different degrees, representing 10 that stimulated low flutolanil. IC50 values low, indicating very high sensitivity population. IC50max 0.1342 0.1457 two regions, Isolates significantly less than those ( = 0.046 ± 0.03 0.030 0.02, respectively), however, differences minimal. There no significant when comparing provinces. found provinces Orellana Los Ríos. It concluded seems causal agent FPR Ecuador, both regions.