一、玉米螟玉米螟又叫玉米钻心虫,是世界性玉米大害虫。玉米螟是多食性害虫,寄主植物多,主要危害的作物是玉米。玉米螟幼虫是钻蛀性害虫,造成的典型症状是心叶被蛀穿后,展开的玉米叶出现整齐的一排排小孔。雄穗抽出后,玉米螟幼虫就钻入雄花危害,往往造成雄花基部折断。雌穗出现以后,幼虫即转移到雌穗取食花丝和嫩苞叶,蛀入穗轴或食害幼嫩的籽粒。另有部分幼虫由茎秆和叶鞘间蛀入茎部,取食髓部,使茎秆易被大风吹折。受害植株籽粒不饱满,青枯早 First, the corn borer Corn borer, also known as corn borer, is a world-wide corn pests. Corn borer is a multi-food pest, host plants and more, the main crop is corn. Corn borer larvae are boring insects, the typical symptoms caused by the heart leaves are worn after the opening of the corn leaves appear neat rows of holes. After the tassel is taken out, the corn borer larvae drill into the male flower and often cause the male flower base to break. After the emergence of the ear, the larvae are transferred to the female spike to eat filaments and tender leaves, bore into the cob or eaten young grain. Another part of the larvae from the stalk and leaf sheath between the moth into the stem, feeding the pith, so that stalks easily blown by the gale. Injured plant grain is not full, early green wither