Inhibitory Activities and Control Efficacy of Nine Biopesticides to Ceratocystis fimbriata Ellis et Halsted

doi:10.16409/j.cnki.2095-039x.2017.05.015

Abstract

Abstract: To screen biopesticides for controlling black rot of sweet potato, the inhibitory activities of 9 biopesticides against mycelial growth and conidial germination of Ceratocystis fimbriata Ellis et Halsted were measured and the control efficacies were tested. The results showed that tetramycin had the highest inhibitory activities to conidial germination and mycelial growth, with the EC₅₀ values of 0.10 and 0.15 mg/L, respectively. Eugenol showed the second highest inhibitory activities, with the EC₅₀ values of 0.24 and 0.93 mg/L, respectively. When inoculated C. fimbriata with 5×10⁴ spores/mL, control efficacy of tetramycin at 6 and 9 mg/L were 66.67% and 78.57%, respectively; At 5×10⁵ spores/mL, the efficacy were 77.44% and 90.23%, respectively. This study provided an experimental basis for rational use of biopesticides for controlling black rot of sweet potato.

Key words: Ceratocystis fimbriata Ellis et Halsted, biopesticides, conidial germination, mycelial growth, control efficacy

CLC Number:

S435.311

ZHANG Desheng, WANG Yongjiang, WANG Shuang, BAI Ruiying, ZHANG Zhenchen. Inhibitory Activities and Control Efficacy of Nine Biopesticides to Ceratocystis fimbriata Ellis et Halsted[J]. journal1, 2017, 33(5): 681-685.

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