胡萝卜根腐病拮抗菌活性及杀菌剂的室内毒力评价

doi:10.12190/j.issn.2096-1197.2022.04.09

Abstract

Abstract:

【Objective】Screen the strains having antagonistic activity against carrot root rot pathogen and assess the indoor toxicity of 19 fungicides to carrot root rot.【Methods】The inhibition effect of the antagonistic strain on the pathogen of carrot root rot was determined by in vitro and in vivo antagonism method. The mycelium growth rate method was used to assess the indoor toxicity inhibitory effects of 19 fungicides on the pathogen.【Results】Bacillus atrophaeus DM3-18 had in vivo inhibitory rate of 72.17% on the carrot root rot pathogen. Out of the 19 fungicides,carbendazim had the best inhibitory activity against carrot root rot pathogen,with an EC₅₀ value of 0.002 8 mg/L;prochloraz,tebuconazole,thiophanate methyl,tridemorph,difenoconazole·propiconazole,trifloxystrobin·tebuconazole,and difenoconazole·azoxystrobin also had good inhibitory effects,with EC₅₀ value less than 20 mg/L;with an EC₅₀ value of 8 407.936 8 mg/L,metalaxyl-hymexazol had the worst inhibitory effect.【Conclusion】Bacillus atrophicus is an antagonistic strain for biological control of carrot root rot that has the potential for further development and application. Carbendazim has inhibitory impact on the carrot root rot pathogen and can be used to control the disease.

Key words: Carrot, Root rot, Antagonistic bacteria, Biological control, Fungicide, Toxicity evaluation

CLC Number:

S436.31

FAN Bowen, LI Zhengnan, ZHANG Lei, FU Chongyi, ZHANG Yanping, WANG Yong, SUN Pingping. Antagonistic bacteria activity against carrot root rot and indoor toxicity evaluation of fungicides[J].Journal of Northern Agriculture, 2022, 50(4): 60-66.

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URL: https://journal30.magtechjournal.com/bfnyxb/EN/10.12190/j.issn.2096-1197.2022.04.09

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Antagonistic bacteria activity against carrot root rot and indoor toxicity evaluation of fungicides

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