使用乐果或氧乐果农药防治桃、杏、梅、枣等果树的害虫,以往有些资料报道要慎重,应事先进行药害试验,以明确能否使用,找出适宜用药浓度。但有些果农不甚了解这方面情况,用乐果或氧乐果防治桃、杏等果树的害虫,结果产生了药害。 1991年6月,藁城县留守乡张王村的一些果农,在防治桃瘤蚜时,使用40％乐果(或氧乐果)乳油1000倍液在桃树上喷布,结果产生了严重药害。据调查,在喷药的当天,即发现部分叶片有萎蔫下 The use of dimethoate or Ometho pest control peach, apricot, plum, jujube and other fruit pests, in the past some data reported to be cautious, should be preceded by phytotoxicity tests to determine whether the use of appropriate to find the drug concentration. However, some fruit farmers do not know enough about this situation and have used peony or omethoate to control the pests of fruit trees such as peaches and apricots, resulting in injury. In June 1991, some farmers in Zhangwangcun, a township left behind in Tancheng County, sprayed 40% dimethoate (or omethoate) EC 1000 on peach trees while controlling peach aphids. The result was serious Injury. According to the survey, on the day of spraying, some of the leaves were found to have wilted