Favorable Bioactivity of the SDHI Fungicide Benzovindiflupyr Against Sclerotinia sclerotiorum Mycelial Growth, Sclerotial Production, and Myceliogenic and Carpogenic Germination of Sclerotia

作者：Xue-ping Huang, Jian Luo, Yufei Song, Beixing Li, Wei Mu, Feng Liu · 发表于：Plant Disease · 年份：2019 · DOI：10.1094/pdis-05-18-0729-re · 被引用次数：25 · 研究领域：Plant pathogens and resistance mechanisms、Fungal Plant Pathogen Control、Powdery Mildew Fungal Diseases

Sclerotinia sclerotiorum, which can cause Sclerotinia stem rot, is a prevalent plant pathogen. This study aims to evaluate the application potential of benzovindiflupyr, a new generation of succinate dehydrogenase inhibitor (SDHI), against S. sclerotiorum. In our study, 181 isolates collected from different crops (including eggplant [n = 34], cucumber [n = 27], tomato [n = 29], pepper [n = 35], pumpkin [n = 32], and kidney bean [n = 25]) in China were used to establish baseline sensitivity to benzovindiflupyr. The frequency distribution of the 50% effective concentration (EC 50 ) values of benzovindiflupyr was a unimodal curve, with mean EC 50 values of 0.0260 ± 0.011 μg/ml, and no significant differences in mean EC 50 existed among the various crops (P > 0.99). Benzovindiflupyr can effectively inhibit mycelial growth, sclerotial production, sclerotial shape, and myceliogenic and carpogenic germination of the sclerotia of S. sclerotiorum. In addition, benzovindiflupyr showed good systemic translocation in eggplant. Using benzovindiflupyr at 100 μg/ml yielded efficacies of 71.3 and 80.5% for transverse activity and cross-layer activity, respectively, which were higher than those of acropetal and basipetal treatments (43.6 and 44.7%, respectively). Greenhouse experiments were then carried out at two experimental sites for verification. Applying benzovindiflupyr at 200 g a.i. ha −1 significantly reduced the disease incidence and severity of Sclerotinia stem rot. Overall, the ...