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一、玉米常见病害及防治1、玉米大斑病1.1、危害特点:主要为害叶片,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点,后沿叶脉向两边发展,形成中央黄褐色,边缘深褐色的梭形或纺锤形的大斑,湿度大时病斑愈合成大片,斑上产生黑灰色霉状物,致病部纵裂或枯黄萎焉,果穗包叶染病,病斑不规则。1.2、防治要点:病发前用品润500~600倍,每隔15-20
First, the common diseases and control of corn 1, the big spot disease of corn 1.1, the hazard characteristics: the main damage leaves, leaf sheath and follicular spread seriously. Field incidence began in the lower leaves, and gradually upward. Early onset of water-like green-gray dots, the development along the veins to both sides of the formation of the central brown, dark brown fusiform or spindle-shaped large spot, when the humidity is large lesions healed into large, dark gray on the spot Moldy, pathogenic parts of the vertical split or wilting Yan, ear package disease, irregular lesions. 1.2, prevention and treatment points: Pre-illness supplies Run 500 to 600 times, every 15-20