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泡桐丛枝病是我省泡桐上的严重病害,据调查,幼树和大树的发病率,常达30—50％,而根生苗发病率仅1～2％。病苗当年秋季即枯死,幼树病株,轻者生长缓慢,重者数年后即枯死。最早认为此病系由一种炭疽病菌侵染引起,以后研究证明,为病毒侵染所致,因为是全株带毒,可通过嫁接和病根育苗传染。近数年来,在国外对桑树萎缩病等一类丛
Paulownia witches broom disease is a serious disease in our province Paulownia, according to the survey, the incidence of saplings and trees, often up to 30-50%, while the incidence of root seedlings only 1 to 2%. Sick seedlings died in the fall of that year, young trees sick, light slow growth, severe cases that died a few years later. The earliest that the disease caused by a pathogen of anthrax infection, later studies have shown that due to viral infection, because the whole plant is poisoned, can be infected by graft and disease root nursery. In recent years, mulberry atrophy in foreign countries such as clumps