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First Report of Boscalid Resistant Botrytis cinerea Isolates Carrying the Mutations H272R, H272Y, P225L, and P225H from Table Grape in Chile

Abstract:

Botrytis cinerea Pers.(teleomorph Botryotinia fuckeliana (de Bary) Whetzel) is a haploid, filamentous ascomycete that causes gray mold on many economically important crops, especially grapevine. The management of gray mold on table grape involves both cultural and chemical methods. B. cinerea has developed resistance to several fungicides, particularly to fungicides with single-site modes of action (Leroux et al. 2010). Currently boscalid, a succinate dehydrogenase inhibitor (SDHI), is used to control gray mold of table grape in Chile, but recently, it has shown reduced efficacy in some vineyards. The objective of this study was to assess the frequency of boscalid resistant isolates (Bos R) in B. cinerea populations from table grape and identify the mutations in the SdhB genes that confer boscalid resistance. Fifty (2011 to 2012) and 238 (2013 to 2014) single spore isolates of B. cinerea were recovered from …