论文部分内容阅读
桃缩叶病。该病是由一钟真菌引起的真菌病害。病菌在桃芽或鳞片缝隙内越冬,翌年春季桃树展叶时,病菌侵入嫩芽,进行初次侵染。病菌可从叶表皮或气孔侵入。侵入后刺激细胞组织,促进细胞膨大和胞壁加厚,叶片上出现波纹症状,叶缘向后卷曲,叶色由绿变红。随叶片逐渐生长,卷曲程度也随之加重。春末夏初在病叶表面生出一层灰白色粉状物。严重时全株叶片变畸形,有的枯死脱落,脱落后叶液处萌发抽生新叶,新叶不再受害。枝梢受害后,呈灰绿色,较健枝短而粗肿,顶端叶
Peach leaf disease. The disease is a fungal disease caused by a bell fungus. Pathogens in peach buds or scales across the winter gap, the next spring peach leaves, the germs invade the buds, the initial infection. Bacteria can invade from the leaf epidermis or stomata. Invaded after stimulation of cell tissue, promote cell expansion and thickening of the cell wall, the leaves appear ripple symptoms, curly leaf edge curl, leaf color from green to red. With the gradual growth of leaves, curl will also increase. Late spring and early summer in diseased leaves surface layer of gray white powder. Serious changes in the whole plant leaves deformed, and some died off, leaves off after the germination of new leaves pumping new leaves no longer suffer. After the shoot damage, was gray-green, relatively short branches and thick swollen, the top leaves