阿维菌素、伊维菌素和芽孢杆菌对美洲斑潜蝇的防治效果

田间试验结果表明 ,阿维菌素对美洲斑潜Liriomyzasativae蝇幼虫防效较好 ,优于伊维菌素对美洲斑潜蝇的防效 ,可较好地控制美洲斑潜蝇幼虫的危害 ,而Btg,Bti,Bs不宜单独用于防治美洲斑潜蝇幼虫。阿维菌素用量为 0 2 7,0 3 6,0 45g (a .i.) 667m2 时 ,对美洲斑潜蝇幼虫防效第 7d校正防效为 65 %左右 ,施药后第 1 1d校正防效为 85 48%～ 99 0 5 % ,施药后第 1 5d校正防效为 90 94%～ 99 89%。伊维菌素 0 5g (a .i.) 667m2 施药后第 3 ,7,1 1d校正防效分别为 61 67% ,90 5 3 % ,90 93 % ,伊维菌素 0 2 5g(a i ) 667m2 相应防效为 5 7.71 % ,84 68% ,85 83 %。Btg ,Bti,Bs施药后第 3 ,7,1 1d校正防效为 3 3 88%～ 5 5 5 4%。

Effectiveness of several microbial insecticides on Liriomyza sativae

Field trials indicated that abamectin was effective in the control of Liriomyza sativae. Abamectin was more effective to L. sativae than ivermectin. Three bacillus products Bacillus thuringiensis var. galleriae (Btv)], B.thuringiensis var. israelensis (Bti)] and B. sphaericcus (Bs) wasn't suitable for the control of L. sativae . Mortality rates after application of abamectin at 0 27, 0 36 and 0 45 g (a.i.)/667 m 2 were around 65% after 7 d, 85 48%～99 05% after 11 d and 90 94%～99 89% after 15 d. Corresponding mortality rates for ivermectin 0 5 g (a.i.)/667 m 2 were 61 67%, 90 53% and 90 93%. When applied at a reduced concentration of 0 25 g (a.i.)/667 m 2 corresponding mortality rates for ivermectin were 57 71%, 84 68% and 85 83% respectively. Corresponding rates for Btg, Bti, Bs. were 38 32%～50 27%, 33 88%～55 54%, and 42 55% ～ 52 30% repectively.