Sensitivity of Monilinia laxa (Ader. & Ruhl.) to Fungicides Having Different Modes of Action

Abstract

Sensitivity of five M. laxa isolates from mumified plum fruits was tested to benomyl, iprodione, trifloxystrobin, tebuconazole and pyrimethanil. Mycellia growth inhibition on growth medium was monitored and susceptibility parameters were determined using probitanalysis. The EC50 values for benomyl were the highest, ranging from 123.1 to 901.5 μg/kg, followed by iprodione (125.9-301.4 μg/kg), trifloxystrobin (4.2-9.2 μg/kg), tebuconazole(14.2-41.8 μg/kg) and pyrimethanil (148.0-190.8 μg/kg). Natural M.laxa populations mediumresistant to benomyl were established. The isolates tested showed a normal sensitivity to iprodione, trifloxystrobin, tebuconazole and pyrimethanil.

Keywords

• M. laxa
• Sensitivity
• Resistance
• Fungicides