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http://dx.doi.org/10.5423/RPD.2020.26.2.61

Detection of Fungicidal Activities against Alternaria dauci Causing Alternaria Leaf Spot in Carrot and Monitoring for the Fungicide Resistance  

Do, Jiwon (Department of Plant Medicine, College of Agriculture, Life & Environment Sciences, Chungbuk National University)
Min, Jiyoung (Department of Plant Medicine, College of Agriculture, Life & Environment Sciences, Chungbuk National University)
Kim, Yongsu (K. C. Carrot Breeding Institute)
Park, Yong (K. C. Carrot Breeding Institute)
Kim, Heung Tae (Department of Plant Medicine, College of Agriculture, Life & Environment Sciences, Chungbuk National University)
Publication Information
Research in Plant Disease / v.26, no.2, 2020 , pp. 61-71 More about this Journal
Abstract
With 32 fungicides, it was examined the inhibitory effects on the mycelial growth of Alternaria dauci KACC42997 causing Alternaria leaf blight of carrot. Showing the results of the agar dilution method, the fungicides belonging to C2, C5, G1, E2, and E3 group were excellent in inhibiting mycelial growth. Protective fungicides belonging to M group, except for iminoctadine tris-albesilate, and pyraclostrobin belonging to C3 group were effective in inhibiting spore germination of pathogens. The fungicides included into C2 group inhibiting succinate dehydrogenase activity and the G1 group inhibiting demethylase activity showed the excellent inhibitory effect on mycelial growth but the inhibitory effect of spore germination was very low. However, fluazinam belonging to C5 group was excellent in inhibiting spore germination as well as mycelial growth. Especially, when 100 ㎍/ml of fluxapyroxad belonging to the C2 group was treated, 47.1% of spore formation was inhibited on the medium. In comparison of the resistance factors of 3 fungicide groups, as G, C, and E group, in populations of A. dauci isolates collected from Gumi, Pyeongchang, and Jeju, resistance factor in the population of Jeju was the lowest. However, two isolates resistant to fludioxonil belonging to E2 group were found in the isolate group of Pyeongchang, and both showed cross-resistance to iprodione and procymidone.
Keywords
Alternaria dauci; Alternaria leaf spot in carrot; Fungicidal activity; Fungicide resistance monitoring;
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Times Cited By KSCI : 4  (Citation Analysis)
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