除虫菊是一种多年生的菊科草本植物,既有较高的经济价值,又有观赏价值。它根、茎、叶、花都含有毒虫素物质,是用来配制杀虫剂的好原料。使用除虫菊可以有效地防治蚜虫、菜青虫、蚊、蝇等害虫,具有高效、低毒、不污染环境、不产生抗药性、无残留、对人畜安全等优点。因此它是一 Pyrethrum is a perennial Asteraceae herbaceous plant, both high economic value, but also ornamental value. Its roots, stems, leaves, flowers contain poisonous substances, is a good raw material for the preparation of pesticides. The use of pyrethrum can effectively control aphids, cabbage caterpillars, mosquitoes, flies and other pests, with high efficiency, low toxicity, does not pollute the environment, does not produce resistance, no residue, the advantages of human security. So it is one