山东烟区烟草上发生一种叶脉坏死病,在发病初期,顶叶脉明,后出现叶脉坏死,继之整叫变黄,枯萎,颇引人注目。1978年以来,我们后调查了福建、四川、辽宁、吉林、黑龙江、安徽、河南、广东等省烟区的许多地方,均发现叶脉坏死病,发病率3.5—12%,病重田达30%以上,给烟草生产造成一定损失。将叶脉坏死病叶,按常规汁液接种在烟(Nicotiana tabacumvar Shandong tobacco smoke occurs on a vein of necrosis, in the early stages of onset, the top vein pulse, vein necrosis appeared, followed by the whole called yellowing, withering, rather compelling. Since 1978, we have surveyed many places in Fujian, Sichuan, Liaoning, Jilin, Heilongjiang, Anhui, Henan, Guangdong and other provinces and found necrosis of the veins, with a prevalence of 3.5-12% and a disease of over 30% , Resulting in some loss of tobacco production. Vein necrosis of the leaves, according to conventional juice inoculation in the tobacco (Nicotiana tabacumvar