Abstract
Seventy-one isolates of Sclerotinia homoeocarpa from 12 sites in Kansas were evaluated in vitro for sensitivity to boscalid using four-fold dilutions ranging from 0.00024 to 4.0 μg/ml to determine the effective concentration that inhibited growth by 50% (EC50). The range of EC50 values was from 0.09 to 3.90 μg/ml with a mean of 0.77 μg/ml, and the log values were distributed normally. A subset of 26 isolates was also tested for boscalid sensitivity on fungicide-treated plants in a greenhouse assay. Higher in vitro EC50 values for boscalid were not correlated with higher percent relative disease severity on boscalid-treated plants. These results provide a starting point for further monitoring of boscalid sensitivity. Accepted for publication 20 January 2012. Published 2 April 2012.
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