新化合物天维菌素的杀虫杀螨活性

Insecticidal and acaricidal activity of novel compound tenvermectin

为明确天维菌素（tenvermectin）的杀虫杀螨活性,分别测定了其对小菜蛾Plutella xylostella（药膜法）、粘虫Mythimna separate Walker（小叶碟添加法）、棉铃虫Helicoverpa armigera Hübner（饲料混药法）、松材线虫Bursaphelenchus xylophilus（浸渍法）和朱砂叶螨Tetranychus cinnabarinus（叶片浸渍法和玻片浸渍法）的室内毒力,并采用叶碟喷雾法测定了其对朱砂叶螨的盆栽药效。结果表明：天维菌素对鳞翅目害虫小菜蛾、粘虫和棉铃虫的LC50值分别为22.21、19.66和22.09 mg/L,对松材线虫的LC50值为1.94 mg/L,毒力显著高于米尔贝霉素（P〈0.05）;叶片浸渍法和玻片浸渍法测得天维菌素对朱砂叶螨的LC50值分别为0.005 1和0.008 9 mg/L。盆栽试验结果表明：0.2 mg/L的天维菌素药后5 d对朱砂叶螨的防效最高,达97.42%;药后7 d,尽管天维菌素与阿维菌素的防治效果均有所下降,但天维菌素不同浓度（0.01250.2 mg/L）处理防效仍保持在80.23%91.96%之间。研究表明,天维菌素对供试的有害生物均具有较高活性,具有研究开发潜力。

Indoor toxicity of novel compound tenvermectin against Plutella xylostella（residual film method）, Mythimna separate Walker（Leaflets disk method）, Helicoverpa armigera Hübner（dietcorporated method）, Bursaphelenchus xylophilus（impregnation method） and Tetranychus cinnabarinus（slide dipmethod and leaf-spraying method） were determined. And the pot efficacy of T. cinnabarinus was determined by the leaf-spraying method. The control efficacy against T. cinnatarinus on broad bean seedling was also evaluated. The results showed that the LC50 value of tenvermectin against P.xylostella, M. separate, H. armigera and B. xylophilus were 22.21, 19.66, 22.09 and 1.94 mg/L,respectively. The result showed that toxicity of tenvermectin and milbemycin differed significantly with LC50 value difference（P 〈 0.05）. The LC50 value of tenvermectin against alduts of T. cinnatarinus were0.005 1 and 0.008 9 mg/L determined by leaf-dipping method and slide-dip method, respectively.Results of pot experiments showed the efficacy against T. cinnatarinus was 80.23%-91.96% at the dosage of 0.0125–0.2 mg/L after the application of tenvermectin. The control efficacy reached the highest（97.42%） 5 days after the treatment at 0.2 mg/kg. However, it started to decrease 7 days after the treatment. The results indicated that tenvermectin is a compound with great potential.