Virulence of Beauveria bassiana to Adults of Delia antiqua (Meigen) and Effects on Their Reproduction

doi:10.16409/j.cnki.2095-039x.2016.06.010

Abstract

Abstract: The virulence of 4 strains of Beauveria bassiana to 1-day-old Delia antiqua (Meigen) adults was detected with insect-dipping method to screen out strains of high pathogenecity. The reproduction and biological parameters were measured to D. antiqua treated with the sublethal dose LC₂₀ and LC₅₀, and effects of the strains on mortality and fecundity of age-specific D. antique adults were compared between treatments by 5.8×10³ and 5.7×10⁵ conidia/mL concentrations. The strain B. bassiana Bb01 showed the highest virulence against D. antique, with LC₅₀ of 1.76×10⁶ conidia/mL, followed by B. bassiana Bb03 and Bb02, with LC₅₀ of 4.05×10⁶ and 1.86×10⁷ conidia/mL, respectively. B. bassiana Bb01 extended preoviposition period of 1-day-old D. antiqua adults and reduced their fecundity by 51.9% and 92.2% at LC₂₀ and LC₅₀ compared with the control, respectively. B. bassiana Bb01 shortened longevity of female adults significantly, while had no effect on egg hatching rate. Although Bb01 caused higher mortality in 1-day-old adults than in 10-day-old adults, fecundity of 10-day-old adults was reduced by 82.5% at 5.7×10⁵ conidia/mL of Bb01 compared with the control.

Key words: Beauveria bassiana, Delia antiqua, reproduction, virulence

CLC Number:

S476.12

LIU Yanyan, ZHU Guodong, LIU Fang, SUN Xia, LUO Yin, XUE Ming. Virulence of Beauveria bassiana to Adults of Delia antiqua (Meigen) and Effects on Their Reproduction[J]. journal1, 2016, 32(6): 743-748.

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