Survey of Fungicide Resistance for Chemical Control of Botrytis cinerea on Paprika

Yoon, Cheol Soo; Ju, Eun Hee; Yeoung, Young Rog; Kim, Byung Sup

doi:2008.24.4.447

Plant Pathol J > Volume 24(4); 2008 > Article

The Plant Pathology Journal 2008;24(4):447-452.
DOI: https://doi.org/10.5423/PPJ.2008.24.4.447 Published online December 31, 2008.

Survey of Fungicide Resistance for Chemical Control of Botrytis cinerea on Paprika

Cheol Soo Yoon, Eun Hee Ju, Young Rog Yeoung, Byung Sup Kim

Abstract

Four hundred and sixty six isolates of B. cinerea were obtained from infected leaves, stems and fruits of paprika grown in greenhouses or plastic film houses in Gangwon province, Korea, between August and November in 2006 and 2007. These isolates were classified into five representative phenotypes of resistant (R) and sensitive (S) reactions as SSR, SRR, RSS, RRS and RSR according to the responses of isolates against benzimidazole, dicarboximide and N-phenylcarbamate fungicide in order. The percentage of five phenotypes were 51.3, 2.4, 35.6, 8.1 and 2.6%, respectively. The SSR phenotype (51.3%) was the most common. Among the nineteen fungicide products evaluated to compare their efficacy against gray mold pathogen on the paprika fruit inoculated with fungal mycelia, the mixture of diethofencarb and carbendazim was the most effective followed by iprodione, boscalid, the mixture of iprodione and thiophanate-methyl, fludioxonil, polyoxin-B, fluazinam, the mixture of tebuconazole and tolyfluanid and procymidone; while in the assay methods inoculated with fungal spores, the mixture of tebuconazole and tolyfluanid was the most effective in controlling gray mold followed by boscalid, fludioxonil, the mixture of diethofencarb and carbendazim and the mixture of pyrimethanil and chlorothalonil.

Key Words: Botrytis cinerea, fungicide resistance, fungicide screening, paprika