Occurrence and Changes of Botrytis elliptica resistant to fungicides

살균제 저항성 백합 잎마름병균(Botrytis elliptica)의 발생과 변화

  • Kim, Byung-Sup (Department of Horticulture, Kangnung National University) ;
  • Chun, Hwan-Hong (Department of Horticulture, Kangnung National University) ;
  • Hwang, Young-A (Department of Horticulture, Kangnung National University)
  • Published : 2001.03.30

Abstract

Five hundred sixteen isolates of Botrytis elliptica were isolated from infected leaves of Lilium longiflorum from Kangwon alpine areas in Korea during tile seasons from 1998 to 2000 and resistance of these isolates against some fungicides were examined. The isolation frequency of phenotypes resistant to benomyl, procymidone, and diethofencarb were 90.1, 32.4, and 40.9%, respectively. The isolates were divided into six phenotypic groups; RSS, RRS, SSR, SRR, RSR and RRR, representing sensitive (S) or resistant (R) to benzimidazole, dicarboximide, and N-phenylcarbamate fungicides in order. The percentage of six phenotypes were 40.7, 8.5, 7.2, 2.7, 19.8, and 21.1%, respectively. The RSS phenotype was the most frequently isolated, and tile SRR consisted of the extremely minor populations. In comparison studies on tile overwintering ability of each phenotype in relation to the others, the most frequently isolated RSS and SSR had the higher fitness ability than the less frequently isolated RSR, SRR, and RRR. Recently, population increase of tile RSR and RRR phenotypes may have resulted from the increased applications of the mixture of carbendazim and diethofencarb to control benzimidazole-resistant B. elliptica since 1998. The results of this study indicate that careful application of the fungicides is necessary to achieve effective control of leaf blight on lily in Korea.

Keywords

Botrytis elliptica;fungicide resistance;benzimidazoles;dicarboximides;N-phenylcarbamate