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敌敌畏挥发性强、易分解、残效期短,特别是高温季节对露天货场的消毒药效更短。因此,我们对敌敌畏延长药效防治储粮害虫作了初步试验。延长敌敌畏的药效,主要是根据敌敌畏易分解的特性,加入硫磺做稳定剂,抑制其分解。硫磺蒸气压在20℃时为0.0002毫米汞柱,比敌敌畏小750倍之多,挥发慢。开始时我们采用三种配方进行试验:第一种是0.15％敌敌畏(80％敌敌畏1克,加水500克)不加硫磺粉;第二种硫磺粉1克加乙醇5克充分搅匀后,再加入0.15％敌敌畏中;第三种硫磺1克加豆浆20克拌匀后注入0.15％敌敌
DDVP strong volatile, easy to decompose, short residual period, especially in the hot season disinfection of open-air cargo field efficacy shorter. Therefore, we made a preliminary trial on the efficacy and control of dichlorvos pesticides stored pests. Extend the efficacy of dichlorvos, mainly based on the characteristics of dichlorvos easy to decompose, adding sulfur as a stabilizer to inhibit its decomposition. The sulfur vapor pressure is 0.0002 mmHg at 20 ° C, which is 750 times less than that of dichlorvos and evaporates slowly. We started with three formulations tested: the first is 0.15% dichlorvos (80% dichlorvos 1 gram, add water 500 grams) without sulfur powder; the second sulfur powder 1 g plus ethanol 5 g fully stir well, and then Add 0.15% dichlorvos; the third sulfur 1 grams plus 20 grams of soy milk mix 0.15% enemy injection