关键词: 球形芽孢杆菌, 发泡块剂

Abstract: Two kinds of fizzy tablets B_s-941(local product)and B_s-Ft(from Germany)of Bacillus sphaericus were tested against the larvae of Culex quinquefasciatus in laboratory and field.Laboratory tests showed that the LD₅₀ was 0.0193 ug/ml for B_s-941 fizzy tablet,and 0.007ug/ml for B_s-Ft fizzy tablet.Three doses of each formulation were used in field trial:0.5,1,1.5g/m²,48h after treatment,the reduction rate of larvae of all doses of the two formulations was 100%,with dose 1.5g/m²,the persistence of the two fizzy tablets could reach 21 days with.But for the contrast B_s C_3-41 liquid group,the persistence was only 13 days with the dose 1.87ul /L.The results showed that the efficacy of loc al fizzy tablet(Bs-941)was as good as that of the Germany fizzy tablet(B_s-Ft) in controlling Culex quinquefasciatus.