楝树素以生长快、成林早、材质优、用途广而著称,它的叶、花、果、种子、树皮等均富含苦楝素、生物碱、萘酚等成分。将苦楝素提取出来制成杀虫剂,用于防治作物害虫有显著效果。在我国,将楝树花、叶、种子、树皮等捣碎加水煮或者浸泡1～2天,去掉渣滓,加一定倍数的水作杀虫剂,用于防治稻螟虫、稻 Melphalan to grow fast, early forest, excellent materials, widely known for its use, its leaves, flowers, fruits, seeds, bark, etc. are rich in toosein, alkaloids, naphthol and other ingredients. Toosendanin extracted into pesticides for the control of crop pests have a significant effect. In our country, neem flowers, leaves, seeds, bark and other mashed plus boiled or soaked for 1 to 2 days, remove the scum, add a certain amount of water as a pesticide for the control of rice stem borer, rice