一、玉米螟危害特点7~8月是二、三代玉米螟的危害盛期,主要危害夏玉米和晚播春玉米。幼虫取食玉米叶肉或蛀食未展开的心叶,造成花叶;抽穗后钻蛀茎秆,致雌穗发育受阻而减产,蛀孔处易倒折。农业防治在玉米收获时实施秸秆粉碎还田,可以有效减少玉米螟越冬基数。在越冬代化蛹前,把主要越冬寄主作物的秸秆处理完毕,可消灭 First, the corn borer Hazard Characteristics 7 to August is the second and third generation of corn borer hazards, the main hazards of summer maize and late sowing spring corn. Larvae feeding corn leaf mesophyll or eating uncultivated leaf, resulting in mosaic; Drilling stems after heading, resulting in obstruction of the development of the ear cut, easy to reverse at the hole. Agricultural prevention and control in the corn harvest when the implementation of straw crushing back to the field, can effectively reduce the base of winter corn borer. In the winter before the pupation, the host of the main wintering host straw finished, can be eliminated