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Subject

Effect of the Registered Control Agents for Fire Blight on Fire Blight Disease at Flowering Stage of Apple in Korea
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국내 과수화상병 등록 약제의 사과나무 개화기 방제 효과

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Type
Academic journal
Author
Hyeonheui Ham (국립농업과학원) Mi-Hyun Lee (국립농업과학원) Eunjung Roh (국립농업과학원) Woohyung Lee (국립농업과학원) Hyo-Won Choi (농촌진흥청) Mi Suk Yang (농촌진흥청) Yong Hwan Lee (국립농업과학원)
Journal
The Korean Society Of Pesticide Science The Korean Journal of Pesticide Science Vol.27 No.3 KCI Accredited Journals
Published
2023.12
Pages
344 - 351 (8page)
DOI
10.7585/kjps.2023.27.4.344

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Effect of the Registered Control Agents for Fire Blight on Fire Blight Disease at Flowering Stage of Apple in Korea
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Abstract· Keywords

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Since first report of fire blight, caused by Erwinia amylovora, in Korea in 2015, enormous economic losses of apple and pears have been reported in Korea. E. amylovora has been registered as a prohibited quarantine pathogen in Korea, so fire blight control tests in the open fields are prohibited. Accordingly, the control agents (CAs) that are being used abroad to control fire blight and that are registered domestically for other plant diseases of apples and pears are being registered as the control agents for fire blight disease in Korea. In this study, the field screening of registered control agents on fire blight disease of apple during flowering period were conducted in an isolated house built in accordance with the LMO safety management regulations operated by the Rural Development Administration in 2021 and 2023. In 2021, one flower per tree (Fuji variety 15-year-old) was inoculated with bacterial suspension at full bloom, and then natural infection was induced to other flowers using bees (Bombus agrorum). CAs were applied twice at three-day intervals, on the 1st and 4th days after inoculation, and the flower infection rate was examined on the 21st day after inoculation. In 2023, all flowers were inoculated at full bloom for 3-year-old Hong-ro varieties. CAs were sprayed twice at three-day intervals, 1 day before and 2 days after inoculation, and the flower infection rate was examined on the 21st and 28th days after inoculation. Most CAs containing streptomycin, oxytetracycline, and oxolinic acid were highly effective, with control values exceeding 70%. On the other hand, biocontrol agents were not effective, with a control value of 47.3-59.3%.

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