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http://dx.doi.org/10.11625/KJOA.2020.28.2.223

Suppressive Effects of Bio-Sulfur on Citrus Scab  

Oh, Myung-Hyup (제주특별자치도 농업기술원)
Hyun, Jae-Wook (농촌진흥청 국립원예특작과원 감귤연구소)
Park, Won-Pyo (제주대학교 식물자원환경전공)
Hyun, Hae-Nam (제주대학교 식물자원환경전공)
Publication Information
Korean Journal of Organic Agriculture / v.28, no.2, 2020 , pp. 223-233 More about this Journal
Abstract
The aim of the present study was to investigate the suppressive effects of the bio-sulfur used by eco-friendly farms on the outbreak of citrus scab. To evaluate the inhibiting effect of bio-sulfur on citrus scab germ tube growth, the citrus scab pathogen Elsinoe fawcettiiwas cultured in PDB and agar media, and germ tube growth was observed after bio-sulfur treatment. At both 40 and 88 h after inoculation, germ tube formation was inhibited by 500-, 1000-, and 2000-fold diluted bio-sulfur, and at dilutions above 4000-fold, germ tube formation was observed, although growth was still inhibited, when compared to untreated cultures. Meanwhile, the occurrence of citrus scab on spring-flush leaves in the field was 40.3% in the untreated control and 5.3, 10.3, 12.3, 15.3, and 24.0% when treated with imibenconazole, 2-4 and 6-6 lime-Bordeaux mixtures, which are also used by eco-friendly farms, 500-fold diluted bio-sulfur, lime sulfur, and 1000-fold diluted bio-sulfur, respectively. The occurrence of citrus scab on citrus fruit was 79.3% in the untreated control and 4.0, 33.8, 42.0, 43.3, 44.8, and 78.0% when treated with imibenconazole, 2-4 lime-Bordeaux mixture, 6-6 lime-Bordeaux mixture, 500-fold diluted bio-sulfur, lime sulfur, and 1000-fold diluted bio-sulfur, respectively. Because citrus scab can infect citrus leaves as early as May, as the spring flush begins, preventative control should be implemented by mid- to late-April, thereby increase disease control and reducing both labor and farming costs.
Keywords
bio-sulfur; elsinoe fawcettii; citrus scab;
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Times Cited By KSCI : 5  (Citation Analysis)
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