Sensitivity to Sterol Biosynthesis Inhibitors of Colletotrichum gloeosporioides Isolated from Persimmon in 2013 in Sangju, Gyeongsangbukdo

Colletotrichum gloeosporioides is one of the most serious pathogens of persimmon in Korea.In 2013, 67 isolates of C. gloeosporioides were isolated from infected fruits, leaf and twigs of persimmon (Diosprosi kaki) at Sangju, Gyeongsangbukdo and fungal responses against five fungicides (prochloraz manganese complex, tebuconazole, mancozeb+myclobutanil, fluquinconazole+prochloraz, and tebuconazole+tolyfluanid) were evaluated by their growth on the fungicide-medium.All isolates were inhibited mycelium growth on the medium with each recommended application concentration of flied.EC 50 (µg/ml) of tebuconazole was from 0.02 to 1.04 and average was 0.31.EC 50 (µg/ml) of prochloraz manganese complex was 0.02~0.23 average was 0.078.Average EC 50 values (µg/ml) of Fluquinconazole+Prochloraz (FP) was 0.029.On the basis EC 50 (µg/ml), the correlation coefficient (r) between tebuconazole and prochloraz manganese complex, prochloraz manganese complex and FP, tebuconazole and FP were 0.42, 0.44 and 0.27, respectively.