玉米,是我国北方的主要粮食作物之一,也是我们农民朋友大量种植的重要作物。不断提高玉米产量,增加种植效益,是我们广大农民朋友追求的目标。然而,大量病害、虫害的频繁发生,以及受干旱、洪涝等恶劣自然灾害的影响,使得保障玉米生产安全和提高玉米产量的难度加大。比如,近年来普遍发生的苗期病害如烂 Corn is one of the major grain crops in northern China and is also an important crop planted extensively by our peasant friends. Constantly raising the output of corn and increasing the planting efficiency are the goals pursued by our peasants and friends. However, a large number of diseases, the frequent occurrence of pests and the adverse natural disasters such as droughts and floods make it more and more difficult to ensure the safety of corn production and increase the yield of corn. For example, seedling diseases such as rot are common in recent years