玉米是辽宁省的主要粮食作物，每年种植面积稳定在１３３万ｈｍ２左右。由于生产上推广的玉米杂交品种抗螟能力低等原因，而多年来受玉米螟为害比较严重，成为影响玉米高产稳产的重要因素。据报道，玉米螟轻发生年减产粮食５％～７％；中等发生年减产１０％～１５％；大发... Corn is the main food crop in Liaoning Province and its annual planting area is stable at about 1.33 million hm2. Due to its low resistance to the stem borer due to the promotion of production in maize hybrids, the damage to corn borer is more serious over the years and has become an important factor affecting the high and stable yield of corn. It is reported that corn borer light annual reduction of grain production 5% to 7%; moderate annual reduction of 10% to 15%;