美国生物技术公司──孟山都公司宣布培育成功一种抗食根害虫的转基因玉米。有两种甲虫的幼虫以玉米的根部为食。美国大约有６０７万ｈｍ２的玉米受虫害。虫害每年给美国玉米种植业造成的损失达１０亿美元。农民们每年耗资１．５亿美元购买化学杀虫剂来控制虫害。美国中西部地 Monsanto, a biotechnology company in the United States, announced the successful cultivation of a genetically modified corn that is resistant to pests. Larvae with two beetles feed on the roots of corn. There are about 6,070,000 hm2 of corn in the United States affected by pests. The damage caused by pests to the U.S. corn plantation each year amounts to 1 billion U.S. dollars. Peasants spend $ 150 million annually on chemical pesticides to control pests. Midwest America