Biological Activity of Pyraclostrobin Against Coniella granati Causing Pomegranate Crown Rot

文献类型： 外文期刊

第一作者： Yang, Xue

作者： Yang, Xue;Gu, Chun-Yan;Zang, Hao-Yu;Sun, Jia-Zhi;Bai, Yang;Chen, Yu;Sun, Jia-Zhi;Bai, Yang;Chen, Yu;Chen, Yu

作者机构：

关键词： chemical; disease management; fungi; tree fruits

期刊名称：PLANT DISEASE （ 影响因子：4.614； 五年影响因子：5.33 ）

ISSN： 0191-2917

年卷期： 2021 年 105 卷 11 期

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收录情况： SCI

摘要： Pomegranate crown rot caused by Coniella granati is one of the most severe diseases of pomegranate. No fungicides have been registered for controlling this disease in China. Pyraclostrobin, belonging to strobilurin fungicides, has a broad spectrum of activity against many phytopathogens. In this study, based on the mycelial growth and conidial germination inhibition methods, we investigated the biological activity of pyraclostrobin against C. granati in the presence of 50 mu g/ml of salicylhydroxamic acid using 80 isolates collected from different orchards in China from 2012 to 2018. The EC50 (50% effective concentration) values ranged from 0.040 to 0.613 mu g/ml for mycelial growth and 0.013 to 0.110 mu g/ml for conidium germination. Treated with pyraclostrobin, the hyphae morphology changed and conidial production of C. granati decreased significantly. The result of transmission electron microscope showed that treatment of pyraclostrobin could make the cell wall thinner and lead to ruptured cell membrane and formation of intracellular organelle autophagosomes. The pyraclostrobin showed good protective and curative activities against C. granati on detached pomegranate fruits. In field trials, pyraclostrobin showed excellent control efficacy against this disease, in which the treatment of 25% pyraclostrobin EC 1,000x provided 92.25 and 92.58% control efficacy in 2019 and 2020, respectively, significantly higher than that of other treatments. Therefore, pyraclostrobin could be a candidate fungicide for the control of pomegranate crown rot.

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