FUNGICIDE SENSITIVITY OF 207 Sclerotica sclerotiorum ISOLATES FROM DRYBEAN AND SOYBEAN

摘要

Dry beans are valued at $ 1.01 billion and soybean at $41.0 billion per annum. Disease caused by Sclerotinia sclerotiorum produces up to 100% yield loss when environmental conditions are favorable. Since there are neither dry bean nor soybean varieties completely resistant, fungicide applications are integral to reduce yield loss from S. sclerotiorum. This fungus is thought to have intermediate risk of fungicide resistance, and resistance has been reported in Brazil from soybean1 and in China from canola3. In the US, potential for resistance to thiophanate methyl was found among isolates from soybean2, yet no studies have been conducted on dry bean. Continued use of fungicides may lead to resistance or low sensitivity to the most commonly used fungicides. This study aims provide a contemporary look of fungicide sensitivity from dry bean and soybean in the US.