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玉米大斑病,是当今世界上玉米主要叶部病害之一。据报导,在严重流行的年份和地区,可使玉米籽粒减产50％,例如美国在1951、1952和1961年,玉米大斑病大发生,曾使感病玉米地块每亩减产580余斤。我国的河南、山东、辽宁、吉林等省的玉米大斑病,在六十年代中后期,也曾严重流行,为害很大。近年来,我省玉米大斑病也有日趋严重之势,发生面广,危害大,已成为玉米稳产高产的极大障碍,需尽速解决。
Maize leaf spot is one of the main leaf diseases in the world today. It has been reported that maize grains can be cut by 50% in the most prevalent years and regions. For example, in the United States in 1951, 1952 and 1961, the occurrence of maize leaf spot was greatly reduced. It caused a yield reduction of more than 580 kilograms per mu for susceptible maize plots. The maize leaf spot in the provinces of Henan, Shandong, Liaoning and Jilin of our country was also extremely prevalent in the mid and late 1960s, causing great damage. In recent years, the great maize leaf spot disease in our province has also become more and more serious. It has a wide range of occurrence and great harm. It has become a great obstacle to a steady and high yield of corn and needs to be solved as soon as possible.