Screening of Higher Virulent Fungal Strain against Delia antigua

doi:10.16409/j.cnki.2095-039x.2016.02.006

Abstract

Abstract: Six strains of entomopathogenic Beauveria bassiana were screened depending on virulence against Delia antigua. The virulence of these strains against D. antigua were further evaluated in laboratory. Bioassay results showed that the strain CQBb119 had the highest virulence. The accumulative mortality reached 77.78% and the cadaver rate reached 58.52%. The LT₅₀ value was 6.10 d when D. antigua maggot were treated with 1×10⁷ spores/mL spore suspension for 14 d. Inoculated on maggot, pupa, and onion fly of the D. antigua, the test results indicated that the mortality of D. antigua increased with the concentration of the spores suspension while the median lethal time fell. When treated with 1×10⁸ and 1×10⁹ spores/mL spores suspension of CQBb119, LT₅₀ values of D. antigua maggot were 5.48 d and 4.94 d. The LC₅₀ value at 14th day was 1.35×10⁶ spores/mL. B. bassiana CQBb119 had a certain virulence against the onion fly and pupa but the mortality was lower than 50%. The results indicated that the screened entomopathogenic B. bassiana CQBb119 had effective insecticidal activity, and could be used as a potential biological pesticide for controlling of D. antigua.

Key words: Beauveria bassiana, Delia antigua, virulence, biocontrol

CLC Number:

YUAN Lei, SHEN Ling, WANG Zhongkang, YIN Youping. Screening of Higher Virulent Fungal Strain against Delia antigua[J]. journal1, DOI: 10.16409/j.cnki.2095-039x.2016.02.006.

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