Sensitivity of Monilinia laxa (Ader. & Ruhl.) to fungicides having different modes of action

Abstract

Sensitivity of five M. laxa isolates from mumified plum fruits to benomyl, iprodione, trifloxystrobin, tebuconazole and pyrimethanil was tested. Mycellia growth inhibition on growth medium was monitored and susceptibility parameters were determined using probit analysis. 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 medium resistant to benomyl were established. The isolates tested showed a normal sensitivity to iprodione, trifloxystrobin, tebuconazole and pyrimethanil.

Ispitivana je osetljivost pet izolata M. laxa izolovanih sa mumificiranih plodova šljive na benomil, iprodion, trifloksistrobin, tebukonazol i pirimetanil. Praćena je inhibicija porasta micelije na hranljivoj podlozi i utvrđeni su parametri osetljivosti metodom probit analize. Najveć i raspon srednjih efektivnih koncentracija bio je kod benomila (123,1-901,5 μg/kg). EC50 vrednosti za ostale fungicide bile su u intervalu: iprodion (125,9-301,4 μg/kg), trifloksistrobin (4,2-9,2 μg/kg), tebukonazol (14,2-41,8 μg/kg) i pirimetanil (148,0-190,8 μg/kg). Utvrđeno je postojanje umereno rezistentnih prirodnih populacija M. laxa na benomil. Svi ispitivani izolati ispoljili su normalnu osetljivost na iprodion, trifloksistrobin, tebukonazol i pirimetanil.