Serratia marcescens NlM280 and application thereof as insecticide

Abstract

The invention discloses serratia marcescens NlM280 and an application thereof as an insecticide. A bacterial suspension obtained by the fermentation culturing of the serratia marcescens NlM280 or a supernatant obtained by centrifuging the bacterial suspension can be used for preventing and treating brown planthopper or chilo suppressalis. The results of injecting or feeding the bacterial suspension or the fermented supernatant of the serratia marcescens NlM280 into the brown planthopper show that the fatality rate of the brown planthopper after being injected with the bacterial suspension for 2 days can reach 100%; the fatality rate of the brown planthopper after being fed with the bacterial suspension for 3 days can reach 79.8%; the pathogenic effects of the serratia marcescens NlM280 are not influenced if the supernatant of the fermentation liquor of the serratia marcescens NlM280 is treated at the temperature of below 55 DEG C; the fatality rate of the brown planthopper after being injected with the fermented supernatant for 2 days can reach 97.2%; the effect on the brown planthopper after being fed with the fermented supernatant is hysteretic, i.e., the fatality rate of the brown planthopper after being fed with the fermented supernatant for 6 days reaches 84.2%. After the bacterial suspension or the fermented supernatant is sprayed to rice, if the rice is fed to the chilo suppressalis, the fatality rate of the bacterial suspension or the fermented supernatant to the chilo suppressalis can reach above 80.0% at the 4th day.

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