据资料介绍:玉米矮花叶病在全国各地玉米产区均有不同程度的发生,一般玉米整个生育期都可感染,但以幼苗至抽雄前为主。发病初期心叶基部出现许多椭圆形褪绿小点,以后向叶尖扩展。叶脉间叶肉逐渐失绿、变黄,而两侧叶脉仍保持绿色,因而呈现黄绿相间的条纹状花叶,感病后植株均表现不同程度的矮化,一般较正常植株矮10～30％。 According to the information: corn dwarf mosaic disease in all parts of the country corn production areas have varying degrees of occurrence, the general maize throughout the growing period can be infected, but the seedlings to tasseled mainly. At the beginning of the onset there are many oval chlorotic spots at the base of the heart leaf and later expand to the tip of the leaf. Leaf veins gradually lost its green color and turned yellow, while the veins on both sides remained green, resulting in yellow-green and white stripe-shaped mosaic. The susceptible plants showed varying degrees of dwarfing, generally 10 to 30% shorter than the normal plants. .