桃缩叶病一、症状。该病是一种由真菌引起的病害。病菌在桃芽或鳞片缝隙内越冬,翌年春季桃树展叶时,病菌侵人嫩芽,进行初浸染。病菌可从叶片表皮气孔侵入。侵入后刺激细胞组织,促进细胞膨大和细胞壁加厚,叶片上出现波纹症状,叶缘向后卷曲,叶色由绿变红。随着叶片的逐渐生长,卷曲程度也逐渐加重。春末夏初在病叶表面生出一层灰白色粉状物,严重时全株叶片畸形,有的 Peach scrub disease symptoms. The disease is a disease caused by fungi. Pathogens in peach buds or scales across the winter gap, the next spring peach leaves, the germs invade the buds, the initial dip. Bacteria can invade leaf stomata. Invaded after stimulation of cell tissue, promote cell expansion and thickening of the cell wall, the leaves appear ripple symptoms, leaf margin curly back, leaf color from green to red. With the gradual growth of leaves, the degree of curl has gradually increased. Late spring and early summer in diseased leaves surface to produce a layer of white powder, the whole plant leaves in severe deformity, and some