我国是世界产棉大国，然而近年来棉铃虫在我国许多棉花产区大范围发生，给我国农作物尤其是棉花带来巨大为害。棉铃虫何以如此猖仅？我国科学家经过4年多的试验分析发现，气候干旱、施用氮肥量过大和不合理使用化学农药是棉铃虫在我国大范围发生的主要原因。作为国家攀登计划研 China is the world’s largest producer of cotton. However, in recent years, the cotton bollworm has occurred on a large scale in many cotton producing areas in our country, causing great damage to our crops, especially to cotton. Why bollworm only rampant? After more than four years of experiment and analysis by Chinese scientists, it has been found that the main reason for the occurrence of cotton bollworm in our country is arid climate, excessive nitrogen fertilizer application and unreasonable use of chemical pesticides. As a national climbing plan research