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泡桐丛枝病是影响泡桐生长的严重病害,此病在我国分布甚广,尤以华北平原为害严重。最常见病状为丛枝型,极少见花变枝叶型。健康泡桐实生苗经病树皮嫁接表现典型丛枝病状。用电镜观察病枝叶的超薄切片,在韧皮部筛管中发现有大量类菌原体(MLO)。类菌原体圆形或椭圆形,直径约为200—820nm,具有10nm厚的单位膜。用病枝叶汁液接种不能传病。病树的种子不带毒,采用种子育苗可减少丛枝病的发生。用病树根及带毒苗繁殖可以传病。防治丛枝病可推广种子繁殖。严禁从病区引种种根和苗木。用40—50℃温水浸种根30分钟或用1000单位四环素溶液浸种根12小时。用10000单位四环素、5%硼酸钠注入病树干基部髓心或用根吸方法,都有明显治疗效果。
Paulownia witches broom disease is a serious disease affecting the growth of Paulownia, the disease is widely distributed in our country, especially in the North China plains severely damaged. The most common symptoms for the cluster type, rarely seen in the flower-like foliage. Health Paulownia seedlings grafted by disease bark typical typical symptoms. Ultrathin sections of diseased leaves were observed with electron microscope, and a large number of mycoplasmas (MLOs) were found in phloem sieve tubes. Mycoplasmas are round or oval with a diameter of about 200-820 nm and have a unit membrane of 10 nm thick. Vaccination with diseased branches and leaves can not be transmitted disease. Sick tree seed without poisoning, the use of seedling can reduce the incidence of broom disease. Diseases can be transmitted by disease root and seedling multiplication. Prevention and treatment of cucumbers can promote seed multiplication. It is forbidden to introduce kinds of roots and seedlings from the ward. Soak the roots with warm water at 40-50 ° C for 30 minutes or soak the root with 1000 units of tetracycline solution for 12 hours. With 10000 units of tetracycline, 5% sodium borate injection into the trunk of the base pith or root suction method, have obvious therapeutic effect.