玉米锈病是玉米中后期的主要病害之一,近几年在我县有逐年加重发生的趋势,常造成叶片提前干枯,经测产调查,一般减产10％—20％,严重的达30％以上。 1.症状 主要侵染叶片,严重时果穗、苞叶和雄花上也可发生。发病初期,叶片两面产生黄褐色夏孢子堆,圆形 Corn rust is one of the most important maize diseases in recent years. In recent years, there is a trend of increasing year by year in our county, which often causes the leaves to dry ahead of schedule. Generally, the output of the test is reduced by 10% -20% and severely up to 30% . 1. The main symptoms of infection leaves, severe ear, bracts and male flowers may also occur. Early onset, leaves on both sides of the brown color of summer spores heap, round