西北农业大学教授吴文君等专家，发现在长江、黄河流域广泛分布的天然植物“苦皮藤”具有很好的杀虫效果，且对人畜几乎无毒害。他们研制的“苦皮球乳油”在茶叶、蔬菜以及城市绿化的病虫害防治中达到了９０％的防治率。这一成果目前已获得国家专利。 据介绍，“苦皮藤”的杀虫 Northwest Agricultural University professor Wu Wenjun and other experts found that in the Yangtze River, the Yellow River valley widely distributed natural plant “Pittoresbium” has a good insecticidal effect, and almost no toxicity to humans and animals. They developed “bitter ball EC” in the prevention and control of pests and diseases of tea, vegetables and urban greening reached 90% of the control rate. This achievement has now won the national patent. According to reports, “bitter vine” insecticide