摘要
用Bt 15A3水悬剂及可湿性粉剂在天津进行了 2地 4次防治绿化林带美国白蛾的小区试验。结果表明,Bt 15A3水悬剂防治 2～ 3龄、4～ 5龄及 5～ 6龄幼虫,2 0 0倍液的药后 3d校正防效值分别达到 10 0 %、98.0 0 %和 31.97%。Bt 15A3可湿性粉剂防治中低龄幼虫,最佳防效出现在药后 5d,以后校正防效值均超过 82 %。
By 2 plots' field trials of Bt 15A3 agents on Hyphantria cunea , the corrected controlling ratios of Bt 15A3 suspension to 2～3, 4～5 and 5～6 stage larvae are 100%, 98.00% and 31.97% ,respectively 3 days after application,while those of 15A3 wettable powder to 2～5 stage larvae have all exceeded 82% 5 days after application. Experiments suggest that early and larger dosage of Bt 15A3 agents' application optimize the controlling ratio.
出处
《天津农学院学报》
CAS
2003年第1期24-26,共3页
Journal of Tianjin Agricultural University
基金
天津市农业生物技术研究中心科技(攻关)计划项目 "新型高效广谱Bt-15A3杀虫菌株产业化技术研究 "(0 3 3 12 2 111-1)
