How to identify the symptoms of barley stripe disease?

How to identify the symptoms of barley stripe disease? Barley stripe disease is a disease infected by seed carrier system. The disease can occur as soon as the first or second young leaves grow out of the seedlings. Initially pale yellow spots or short stripes, and then the disease spot gradually expanded. At the tillering stage, slender stripes parallel to the leaf veins were formed from the leaf base to the leaf tip, and the color changed gradually from pale to yellowish brown. From jointing to heading stage, a large number of mildew grows on the stripes, that is, the conidiophores and conidiophores of the pathogen. In severe cases, the diseased leaves ruptured and dried up, and the whole plant died. The color and shape of stripes vary from variety to variety. The stripes of leaf sheath and stem are small, and the number of conidia is also small. The conidia produced on the diseased plants can invade the leaves and cause repeated infection and produce small dark brown disease spots when the field conditions are suitable, but the disease spots do not expand and then disappear. The diseased plant was shorter than the healthy plant and died in the early stage.