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在有害昆虫的防治中,使用天然的植物性农药具有悠久的历史,积累了丰富的经验。自本世纪四十年代以来,随着有机农药的合成与发展,人们将注意力极大程度地转向于各种高效的有机氯、有机磷、有机氮和其它各种合成农药,忽视了对植物性农药的关注和研究。但是,随着化学农药对环境污染的问题逐渐暴露出来,对人类健康的威胁日益受到人们的重视。因而,探索能够有效地防治各种害虫,对环境影响极小,对人畜安全的新农药、新措施,理所当然地成为全世界农药工作者、环境工作者和植保工作者共同关心的问题。在这种情况下,植物性农药重新引起了人们的重视。不少国家和地区对植物在控制有害生物上的作用进行了一系列的研究,其中研究得较多、作用比较显著的首推楝科植物,特别是印楝粉和印楝油,至今已召开过三次国际印楝会议。现将近年来国外研究情况概述如下,供农药工作者和植保工作者参考。
In the control of harmful insects, the use of natural plant-based pesticides has a long history and has accumulated rich experience. Since the 1940s, with the synthesis and development of organic pesticides, people have turned their attention to various highly effective organochlorines, organic phosphorus, organic nitrogen and other synthetic pesticides, Sexual Pesticide Concerns and Research. However, with the gradual exposure of chemical pesticides to environmental pollution, the threat to human health has drawn increasing attention. Therefore, to explore new pesticides and new measures that can effectively prevent and control various kinds of pests, minimize environmental impact and make people and livestock safe have naturally become issues of common concern to pesticide workers, environmentalists and plant protection workers all over the world. In this case, plant-based pesticide re-attracted people’s attention. Many countries and regions carried out a series of studies on the role of plants in controlling pests. Among them, the most studied are the most important ones, including neem powder and neem oil, which have been held so far Three international neem conferences. Now in recent years, foreign research is summarized as follows for reference for pesticide workers and plant protection workers.