Ja. Lamondia et Sm. Douglas, SENSITIVITY OF BOTRYTIS-CINEREA FROM CONNECTICUT GREENHOUSES TO BENZIMIDAZOLE AND DICARBOXIMIDE FUNGICIDES, Plant disease, 81(7), 1997, pp. 729-732
Botrytis cinerea was isolated from infected plants in six greenhouses
in Connecticut. Forty-five isolates were evaluated in vitro to determi
ne fungicide sensitivity to benzimidazole (benomyl and thiophanate-met
hyl) and dicarboximide fungicides (vinclozolin and iprodione). B. cine
rea isolates with fungicide resistance were recovered from each greenh
ouse sampled. Benzimidazole resistance was more common than dicarboxim
ide resistance (74 to 76% versus 36 to 43%, respectively). Multiple fu
ngicide resistance was common. Nineteen isolates were resistant to bot
h a benzimidazole and a dicarboximide fungicide. The level (EC50) of r
esistance to dicarboximides was low compared with resistance to benzim
idazoles. Isolate growth rate was not correlated to fungicide sensitiv
ity or EC50. Fungicide resistance was apparently unrelated to the patt
erns of fungicide use in greenhouses sampled.