日本用某种杆菌菌体内的蛋白质制造一种杀虫毒素,来取代农药用于苹果树,当对苹果为害最大的害虫卷叶蛾的幼虫吃了苹果树叶后,在一周内即全部死亡。试验结果还证明,这种毒素对人、畜毫无影响。 Japan uses a protein from Bacillus bacteria to make a kind of insecticidal toxin to replace pesticides in apple trees. When the larvae of the insect pest, apple leaf roller, eat the apple leaves, they die within a week. The test results also show that this toxin has no effect on humans and animals.