玉米矮花叶病,又叫花条纹病、黄绿条纹病,在我国各玉米产区均有发生,华北大部及西南、西北的部分地区发病较重,在玉米整个生长期都可感病,尤以苗期受害最重。一般可造成玉米减产5%~10%,流行年份可造成大面积严重减产,是玉米生产上的重要病害之一。1.识别要点1~2片叶时可出现症状,7片叶前后发病最重。最初在幼嫩的心叶基部叶脉间出现许多椭圆形褪绿小点或斑纹(如种子带毒,幼苗子 Corn dwarf mosaic disease, also known as flower stripe disease, yellow-green stripe disease, in all maize producing areas have occurred in most of North China and parts of southwest and northwest heavier incidence of maize throughout the growing season can be susceptible , Especially in the seedling hardest hit. Can generally reduce corn yield by 5% to 10%, popular year can cause large-scale serious yield reduction, is one of the important diseases in corn production. 1. Identify the main points 1 to 2 leaves may appear symptoms, 7 leaves before and after the onset of the most serious. Initially in the young heart leaf base vein between many oval chlorotic spots or patches (such as seed poisoning, young seedlings