| The three pathogens causing root rot of Erigeron breviscapus in Yunnan Province were identified as Fusariumsolani, F.oxysporum and F.semitectum, among which F. solani and F.oxysporum were two new pathogens; the main pathogen was F.solani, and the isolation frequency was 42.86%. After artificial inoculation with or without wounds, the incidence of roots infected by F.solani was 70% and 56.7%, respectively. With mycelium growth rate test method, five fungicides to F.solani had inhibition effects, indicating that the EC 50 values of 50% carbendazim WP, 70% thiophanate methyl WP, 64% oxadixyl·mancozeb WP, 10% difenoconazole WG, and 1 billion live spores of Bacillus subtilis and Pseudomonas fluorescens WP were 0.000 4 mg/mL, 0.050 7 mg/mL, 0.053 5 mg/mL, 0.081 3 mg/mL and 8.624 0 mg/mL, respectively, suggesting that 50% carbendazim WP was the best. The correlation coefficients for the five fungicides were all above 0.89, indicating that mass concentration had high correlation with inhibition. |
