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在美国科罗拉多州的哥伦比亚山区,有一种身体非常小的黄蜂,它们甚至可以停歇在针尖般大小的物体上。目前,这个州的农场主们正利用这种小黄蜂来解决一个很大的虫害问题。科罗拉多州的农场上时常发生一种薯虫(专吃马铃薯和其他植物叶子的甲虫),把大面积的马铃薯、蕃茄和茄子毁坏,给农场主们造成严重的损失。每年用于除治薯虫的化学除虫剂价值大约在1590万美元左右。于是,美国农业部组织了一些科研人员,把大批这样的小黄蜂放养到该州的一些农场上去。他们用了仅仅四年的时间,就已完全控制了薯虫的
In the mountains of Colorado, Colorado, there is a very small wasp that can rest on a needle-sized object. Currently, farmers in this state are using this small wasp to solve a big pest problem. Frequently, on the farms of Colorado, a potato beetle (beetles that eats on the leaves of potatoes and other plants) destroyed large areas of potatoes, tomatoes and eggplants, causing serious losses to farmers. The annual value of chemical pesticides used to cure potato beetles is about 15.9 million U.S. dollars. As a result, the United States Department of Agriculture organized a group of researchers to stock a large number of such wasps to some farms in the state. They took full control of the potato bug in just four years