论文部分内容阅读
玉米矮花叶病是我国玉米上的重要病害之一,近几年在玉米主产区均有不同程度的发生,北京、天津、河北、甘肃、山东、山西、辽宁等省市严重流行,损失达20％～80％。河北省承德60年代曾为矮花叶病偶发区,近几年骨干自交系发病率高达80％～100％,损失惨重。 玉米种子可以携带矮花叶病毒,因此既可以随种子调运远距离传播,扩大疫情,又可以增加田间发病和初侵染源,加重病害流行。1978年甘肃省农科院植保所首次发现某些玉米自交系种子可以带毒,带毒率为0.1～0.4％。最近研究结果显示,玉米种子带毒材料份数和带毒率平均较70年代末大幅度上升。调查的
Maize dwarf mosaic disease is one of the most important maize diseases in China. In recent years, Maize dwarf mosaic disease has occurred to some extent in the main producing areas of maize. Beijing, Tianjin, Hebei, Gansu, Shandong, Shanxi, Liaoning and other provinces and cities are in serious epidemic. Up to 20% ~ 80%. In the 1960s, Chengde, Hebei Province, was a sporadic mosaic plant disease. In recent years, the incidence of backcross inbred lines has been as high as 80% -100%, with heavy losses. Maize seeds can carry dwarf mosaic virus, so it can not only spread long distances with the seeds, but also increase epidemic situation, increase incidence and initial infection sources in the field, and aggravate the epidemic. 1978 Gansu Provincial Academy of Agricultural Sciences plant protection was first found in some corn inbred lines can be poisoned, with a poisoning rate of 0.1 to 0.4%. Recent research results show that the average number of virulent materials and the virulence rate of corn seeds increased significantly from the late 1970s. investigating