Development of benzimidazole and DMI resistance in Gloeosporium ampelophagum from Maharashtra state

Continuous use of carbendazim, difenoconazole and propiconazole has led to development of resistance in Gloeosporium ampelophagum. Among 37 isolates of pathogen, 97.30% population was highly resistant to carbendazim (MIC 1.01 to 28549.43 µg/ml), 5.41% to difenoconazole (MIC 25.63 µg/ml) and 10.81% to propiconazole (MIC 6.26 µg/ml). It was observed that the development of resistance against difenoconazole and propiconazole was increased when compared with carbendazim. Highly resistant population is less in both difenoconazole and propiconazole fungicides. It was noted that difenoconazole and propiconazole are yet suitable for the management of G. ampelophagum where selection pressure is less when compared with carbendazim. Carbendazim became unsuitable due to development of high resistance in G. ampelophagum. However, there will be future need to develop eresistance management strategyi against difenoconazole and propiconazole.