药剂混配对B型烟粉虱药效及烟草安全性评价

The Toxicity and Efficacy of Pyridaben,Acetamiprid and their Mixtures to Bemisia Tabaci(Gennadius) Biotype B and Safety Evaluation to Tobacco

利用试管药膜法测定了啶虫脒等药剂及其混配对B型烟粉虱成虫的毒力,利用烟草植株测定了哒螨灵、啶虫脒及混配对B型烟粉虱的药效以及对烟草植株的安全性。结果显示,啶虫脒在3种新烟碱类药剂中显示了较高毒力,LC50为7.119 5 mg/L,哒螨灵与啶虫脒1:1与2:1混配显示了一定的拮抗作用,4:1与8:1混配显示出了一定的相加作用,LC50分别为1.610 3和1.145 2 mg/L;啶虫咪和毒死蜱1:4与1:8混配的LC50分别为21.813和25.730 mg/L,共毒系数分别为135.68和177.16,有较高的增效作用。药效试验结果显示,15%哒螨灵EC与5%啶虫脒EC质量比8:1混配稀释1 000倍液对烟粉虱显示了优异的防效,3～10 d防效在89.6%～95.8%。安全性试验显示,15%哒螨灵EC与5%啶虫脒EC质量比8:1混配稀释1 000倍液对部分烟草植株可能产生了轻微药害,但不影响其生长。

The toxicity of pyridaben,acetamiprid and their mixtures to Bemisia tabaci（Gennadius） biotype B were tested using tube residual film,the efficacy of them were measured on tobacco plants,and the safety evaluation to tobacco were also measured.The results showed that acetamiprid showed the biggest toxicity in the three neonicotinoid insecticides,LC50 was 7.1195 mg/L,the mixtures of pyridaben and acetamiprid 1：1 and 2：1 showed some antagonism,and the mixtures of pyridaben and acetamiprid 4：1 and 8：1 showed additive effect,LC50 were 1.6103 and 1.1452 mg/L;The joint toxicollogical of Acetamiprid and Chlorpyrifos at the two ratio of 1：4 and 1：8 had great synergism,with the co-toxicity coefficient were 135.68,177.16,respectively.The efficacy results were that the mixture of pyridaben and acetamiprid 8：1（1 000 dilution） had the better efficacy,the defense efficacy was 89.6%~95.8% during 3 to 10 days.The safety evaluation results showed that the mixture of pyridaben and acetamiprid 8：1 1000 dilution showed a slight phytotoxicity to some tobacco plants,but had no effect on growth and development.