论文部分内容阅读
驱除放牧地壁虱的措施,是防止放牧事故的基本课题。自1969年有机氯系杀虫剂禁用以来,出现了很多磷质杀壁虱剂。1969年,美国研制出甲基氯硝酸硫磷杀壁虱剂(分子式:C_7H_7Cl_3NO_3PS)。为白色粒状结晶,不溶于水,溶于有机溶媒,具乳剂,0.5%粒剂、1%粒剂和3%粒剂,均具强烈异臭。经口急性毒性:鼠50%致死量♂2.254毫克/公斤,♀2.032毫克/公斤;经皮急性中毒:鼠50%致死量<2.856毫克/公斤。供试壁虱为未吸血草地壁虱和放牧牛体寄生吸血壁虱。草地驱除用拖车带大型喷雾器按规定剂量喷洒;室内驱除将壁虱摊放在纸上,按规定剂量喷酒。草地末吸血壁虱用10%乳剂1,000倍液,同时进行粉剂试验。10%乳剂能杀死
Measures to exterminate ticks in grazing land are the basic topics for preventing grazing accidents. Since the ban on the use of organochlorine insecticides in 1969, many phosphoric acid killer agents have emerged. In 1969, the United States developed a methylchlorohydratone phosphoric acid methyl ester (formula: C_7H_7Cl_3NO_3PS). White granular crystals, insoluble in water, soluble in organic solvents, with emulsion, 0.5% granules, 1% granules and 3% granules, all with a strong odor. Oral acute toxicity: 50% lethal dose ♂ rat 2.244 kg / kg, ♀ 2.032 mg / kg; acute percutaneous toxicity: 50% lethal dose of <2.856 mg / kg. Test ticks for non-blood-sucking grass ticks and grazing cattle parasitic vampire ticks. Spraying grass with a large sprayer with a spray of the required dose; indoor repellent tick spread on paper, according to the provisions of the spray dose. At the end of the meadow, ticks were diluted 1,000 times with 10% emulsion and tested for dust. 10% emulsion can kill