编者按:玉米是一种生长期短,产量高、较耐旱不耐涝的禾本科碳四植物。但在生长中,玉米病虫害对玉米的产量和质量有着重要的影响。因此了解和掌握病虫害的防治是保证玉米健康成长的关键。本文总结了玉米主要病虫害的症状、发病规律及其防治方法,以期为玉米病虫害防治提供参考。1主要病害1.1玉米大小斑病(1)症状。主要危害叶片,严重时波及叶鞘和包叶。田间发病始于下部叶片,逐渐向上发展。发病初期为水渍状青灰色小 Editor’s Note: Corn is a short-term growth period, high yield, more drought tolerant waterlogging gramineous carbon four plants. However, in the growth of maize pests and diseases on the yield and quality of maize has an important impact. Therefore, to understand and master the prevention and control of pests and diseases is to ensure the healthy growth of corn. This paper summarizes the main diseases and insect pests of corn symptoms, incidence and prevention methods, with a view to provide a reference for the prevention and control of corn diseases and insect pests. 1 major diseases 1.1 corn size spot disease (1) symptoms. The main hazards leaves, severe cases spread to leaf sheaths and leaves. Field incidence began in the lower leaves, and gradually upward. Early onset of water-like green-gray small