Pathogen Identification and Fungicide Evaluation for Sclerotinia Stem Rot of <i>Gerbera jamesonii</i>

CAO Yiyang; XIA Chaoshui; CHEN Changming; CHEN Weiting; GAN Weixin; LIN Huifeng; LIN Fazhuang; MO Zhilong

doi:10.19303/j.issn.1008-0384.2021.10.013

Volume 36 Issue 10

Oct. 2021

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Article Navigation > Fujian Journal of Agricultural Sciences > 2021 > 36(10): 1210-1216

CAO Y Y, XIA C S, CHEN C M, et al. Pathogen Identification and Fungicide Evaluation for Sclerotinia Stem Rot of Gerbera jamesonii [J]. Fujian Journal of Agricultural Sciences，2021，36（10）：1210−1216 doi: 10.19303/j.issn.1008-0384.2021.10.013

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CAO Y Y, XIA C S, CHEN C M, et al. Pathogen Identification and Fungicide Evaluation for Sclerotinia Stem Rot of Gerbera jamesonii [J]. Fujian Journal of Agricultural Sciences，2021，36（10）：1210−1216 doi: 10.19303/j.issn.1008-0384.2021.10.013

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Pathogen Identification and Fungicide Evaluation for Sclerotinia Stem Rot of Gerbera jamesonii

doi: 10.19303/j.issn.1008-0384.2021.10.013

Flower Research Institute, Institute of Sanming Agricultural Sciences, Sanming, Fujian　365051, China

Received Date: 2021-07-09
Rev Recd Date: 2021-08-16

Available Online: 2021-10-23

Publish Date: 2021-10-28

Abstract

Abstract

Objective The pathogen of sclerotinia stem rot, a major disease of Gerbera jamesonii cultivated in Fujian, was identified. Effective fungicides that could be alternatively applied to curtail drug resistance were evaluated. Method The causative pathogen of sclerotinia stem rot was isolated from tissue of the diseased plant and verified by Koch’s rule as well as morphological observation and ITS sequence of the microbe. Toxicities of selected fungicides were determined in the laboratory. Result The isolated strain, C4-1, was identified as the culprit to be Sclerotinia sclerotiorum. Among the fungicides, hymexazol with an EC₅₀ of 0.032 4 μg·mL⁻¹ was most potent in inhibiting the pathogen growth. It was followed by boscalid with an EC₅₀ of 1.033 7 μg·mL⁻¹, dimetachlone with an EC₅₀ values of 1.8362 μg·mL⁻¹, triadimenol with an EC₅₀ of 6.9408 μg·mL⁻¹, and carbendazim the least effective agent with anEC₅₀ of 22.434 9 μg·mL⁻¹. Conclusion S. sclerotiorumwas isolated and identified as the pathogen that caused the sclerotinia stem rot disease on G. jamesonii in the province. Of the fungicides evaluated, hymexazol, boscalid, and dimetachlone, could be used alternatively for the disease control to minimize drug resistance by the pathogen.
- Gerbera jamesonii,
- sclerotinia stem rot,
- Sclerotinia sclerotiorum,
- identification,
- toxicity test

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References(24)

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