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1、烟草花叶病烟草花叶病是由烟草花叶病毒侵染引起的一种病毒病害,在全国各烟区普遍发生。幼苗染病,沿叶脉组织变浅绿色,对光看呈半透明状,蔓延整个叶片后形成黄绿相间斑驳,俗称“花叶”。病叶边缘有时向背面卷曲,叶基松散,叶片厚薄不均,甚至皱缩扭曲呈畸形。早期发病烟株节间缩短,植株矮化,生长缓慢。主要传播方式为接触摩擦传播,田间操作时,手和工具接触叶后再接触健株叶片,能引起发病。种子、肥料和土壤中的病残体,带病的寄主植物,加工后的烟叶、烟丝、烟末等,都可以成为初侵染的来源。主要防治方法有:(1)轮
1, Tobacco Mosaic Disease Tobacco mosaic disease is a virus disease caused by the infection of tobacco mosaic virus, which occurs in various tobacco-growing areas throughout the country. Seedlings infected with light green tissue along the veins, the light see was translucent, spreading the entire leaf to form yellow-green and white mottled, commonly known as “mosaic ”. Sick leaves at the edge sometimes curled to the back, leaf-based loose, uneven leaf thickness, and even deformed twisted distortion. Early onset of tobacco internodes shortened, dwarf plants, slow growth. The main mode of transmission for contact friction transmission, field operation, hand and tool contact leaves and then contact with plant leaves, can cause disease. Diseases of seeds, fertilizers and soils, diseased host plants, processed tobacco leaves, shredded tobacco, and tobacco can all be sources of primary infection. The main control methods are: (1) round