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近年来,我国华北和东北玉米区普遍发生由弯孢菌引起的叶斑病,即玉米弯孢菌叶斑病,病害发生面积逐年扩大,病情逐渐严重。其为害程度有超过大斑病和小斑病的趋势。1996年,辽宁绥中县大面积发生玉米弯孢菌叶斑病,病级达4级,玉米总产损失达800万公斤。 玉米弯孢菌叶斑病的病原菌主要为弯孢菌,发病初期叶片上出现点状褪绿斑,病斑逐渐扩展,呈
In recent years, leaf spot disease caused by Curvularia occidentalis is commonly occurred in maize in North China and Northeast China, that is Curvularia lunata leaf spot, the area of the disease is expanding year by year, and the disease gradually becomes serious. The degree of damage is greater than the spotted spot and small spot disease trend. In 1996, a large area of maize curvularia leaf spot was found in Suizhong County, Liaoning Province, with a grade of 4 and a total loss of 8 million kg of corn. The main pathogens of Curvularia lunata were Curvularia, spotted chlorotic spots appeared on the leaves at the early stage of onset, and the lesions gradually expanded