Comparing Stagonosporopsis spp. Fungicide Resistance Profiles in Florida and East China Cucurbit Production Systems
文献类型： 外文期刊
作者： Newark, Mason J. 1 ; Li, Pingfang 2 ; Yang, Xing-Ping 2 ; Paret, Mathews L. 1 ; Dufault, Nicholas S. 1 ;
作者机构： 1.Univ Florida, Dept Plant Pathol, Gainesville, FL 32611 USA
2.Jiangsu Acad Agr Sci, Nanjing, Peoples R China
3.Univ Florida, North Florida Res & Educ Ctr, Quincy, FL 32351 USA
关键词： chemical; disease management; fungi; vegetables
期刊名称：PLANT DISEASE （ 影响因子：4.438； 五年影响因子：4.7 ）
ISSN： 0191-2917
年卷期： 2020 年 104 卷 1 期
页码：
收录情况： SCI
摘要： Gummy stem blight, caused by Stagonosporopsis spp., is a major disease of cucurbits in the United States and China that is managed primarily through the use of fungicides. The objective of this study was to monitor and compare the recent fungicide resistance profiles of Stagonosporopsis spp. in Florida open-field and East China protected-structure production systems. Isolates of Stagonosporopsis spp. were evaluated for sensitivity to the commonly used fungicides azoxystrobin, boscalid, tebuconazole, and thiophanate-methyl at discriminatory rates of 0.096, 0.034, 0.128, and 100 mg/liter, respectively. Isolates were collected from Jiangsu, Jiangxi, Zhejiang, and Anhui provinces in China (n = 69), 12 counties in Florida (n = 89), and one county in Georgia (n = 6). More than 50% of isolates from Florida and East China were resistant to thiophanatemethyl. Boscalid resistance was detected in both isolate collections but was two times more frequent in China. Resistance to azoxystrobin was detected in 66% of isolates in Florida but only 7% in China. Tebuconazole was effective in controlling the mycelia growth of Stagonosporopsis spp. in both collections. The results indicate that both production systems currently face similar challenges related to the development of fungicide resistance in Stagonosporopsis spp. However, the resistance profiles are unique for both production systems.
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