广播电视英语短句 第 150 课：棉花的种植-4

The scientists say their research shows that the Bt cotton has become a source of mirids. 科学家表示他们的研究显示出BT棉已经成为了盲蝽问题的根源。

They say the population increases are related to drops in insecticide use on the cotton crop. 他们表示盲蝽数量的增加与减少了棉花作物的杀虫剂用量有关。

The genetically engineered cotton is designed to help farmers save money by decreasing the need for poisons. 转基因工程棉的设计可以通过降低对农药的需求来帮农户省钱。

But the scientists say the Chinese farmers have now had to use more insecticides to fight the mirids. 但是科学家表示中国农户现在却不得不用更多的杀虫剂与盲蝽抗争。

Bt is a bacterium that was discovered in the early twentieth century. BT是在二十世纪早期被发现的一种细菌。