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一、敌敌畏的杀虫特点 敌敌畏具有很高的熏杀、接触和胃毒作用,如以对家蝇为例,一般敌百虫对家蝇的毒效是相当高的,但敌敌畏比敌百虫对家蝇的毒效还要高得多。作者用天津农药厂生产的90％敌敌畏原油进行了下列毒性试验。 (一)胃毒毒性 用5％的糖水配成不同浓度的敌敌畏和敌百虫溶液,饲喂已经饥饿的家蝇,以便求出其最低致死浓度。 试验结果,敌敌畏对家蝇的胃毒最低致死浓度为千万分之一;敌百虫为百万分之一。 (二)接触毒性 用点滴法比较了敌敌畏、地亚农、乐果、敌百虫和马拉松等五种农药的毒性,其结果见表1。
First, the insecticidal characteristics of dichlorvos DDVP has a high fumigation, exposure and stomach toxicity, such as the housefly, for example, the general toxicity of trichlorfon on house flies is quite high, but the dichlorvos than trichlorfon Toxicity to houseflies is much higher. The author uses 90% of DDVP crude oil produced in Tianjin Pesticide Factory for the following toxicity test. (A) Stomach toxicity Toxicity of 5% sugar dubbed into different concentrations of dichlorvos and trichlorfon solution, fed starved Housefly in order to find the minimum lethal concentration. The test results showed that the lethal concentration of dichlorvos to housefly gastritis was one millionth, and trichlorfon was one millionth. (B) of the contact toxicity compared with the drip method of dichlorvos, diamines, dimethoate, trichlorfon and marathon and other five kinds of pesticides toxicity, the results shown in Table 1.