有多种植物对于害虫有忌避或毒杀作用,是因为这些植物含有某种有毒的化学成分,致使昆虫中毒或忌避,有些有毒的植物还可利用来防治害虫。如果能使植物吸收一种毒剂,传导至植物植株的全部组织,对于害虫也应该收到相似的长期防治效果。近来已经发现有多种药剂是可以被植物吸收传导的。 There are a variety of plants that are repellent or toxic to pests because these plants contain some toxic chemical that can poison or repel insects. Some toxic plants can also be used to control pests. If plants are allowed to absorb a single dose of the agent and pass on to all the tissues of the plant, they should also receive similar long-term control of pests. Recently, it has been found that many kinds of medicaments can be absorbed and transmitted by plants.