Sensitivity of Colletotrichum spp. isolated form red-pepper to sterol biosynthesis inhibiting-fungicides and their field fitness

Sensitivity of Colletotrichum spp. isolated form red-pepper to sterol biosynthesis inhibiting-fungicides and their field fitness

2002

A:PS

Among 34 isolates of Colletotrichum spp., 20 from red pepper and 14 from apple, only one isolate 2001-45 was identified as the isolate resistant to sterol biosynthesis inhibiting fungicides. EC50 values of the isolate 2001-45 were 153.5, 42.7, 34.0, and 17.1 ug/m/for myclobutanil, tebuconazole, hexaconazole and nuarimol, respectively. The resistance factor of the isolate 2001-45 against the other isolate 2001-44 to 4 above fungicides was ranged from 17 to 57. However, EC50 value of the 2001-45 for prochloraz was 0.07 ug/ml, which was lower than those of the 2001-44 and the isolate JC24. For the fitness test of the 2001-45, mycelial growth, sporulation on PDA and pathogenicity on fruits were investigated. No difference in mycelial growth was found between 2001-45 and 2001-44, but great difference in sporulation. No symptom was developed by 2001-45 even by wound inoculation of pepper fruit. Therefore, this study indicated that the isolate 2001-45 was inferior to the other isolates in the fitness, although the isolate 2001-45 was highly resistant to sterol biosynthesis inhibiting fungicides.

v.8(4):239-244, RESEARCH IN PLANT DISEASE

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