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Baseline sensitivity of Monilia yunnanensis to the DMI fungicides tebuconazole and triadimefon |
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| Authors: | Nan-Nan Yuan Shu-Ning Chen Liu-Xiang Zhai Guido Schnabel Liang-Fen Yin Chao-Xi Luo |
| Institution: | 1. Department of Plant Pathology, College of Plant Science and Technology and the Key Lab of Crop Disease Monitoring & Safety Control in Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China 2. Kunming Sijiqing Pesticide Co., Ltd, Kunming, 655000, China 3. School of Agricultural, Forest and Environmental Sciences, Clemson University, Clemson, SC, 29634, USA |
| Abstract: | Monilia yunnanensis was recently identified as a new species causing brown rot of peach in China. Sterol 14α-demethylase inhibitors (DMIs) continue to be important in the management of brown rot of Monilinia spp. worldwide. Tebuconazole and triadimefon are two kinds of DMI fungicides that may be used for brown rot control in China. To establish the baseline sensitivity of M. yunnanensis to these two DMI fungicides, 203 M. yunnanensis single spore isolates were collected. Measurements of sensitivity to the two fungicides were based on inhibition of mycelial growth. For both fungicides, the sensitivity distribution was a unimodal curve, with an EC50 range (the effective concentration to inhibit mycelial growth by 50 %) of 0.0001–0.0644 μg/ml for tebuconazole and 0.2311–1.7477 μg/ml for triadimefon. The M. yunnanensis isolates were obtained from orchards where DMI fungicides have not been used for peach brown rot control, thus the fungicide sensitivity distribution established in this study can be considered as the baseline for monitoring the resistance development in M. yunnanensis once the DMI fungicides are used to control peach brown rot. |
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