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研究结果表明 ,陕西烟田烟草蚜传病毒病的初侵染源主要来自当地的冬油菜田 ,冬油菜带毒量占总越冬毒量的 87.3 6%。烟草蚜传病毒病的主要类群有烟草黄瓜花叶病毒 ( CMV)、烟草蚀纹病毒 ( TEV)、马铃薯 Y病毒 ( PVY)。迁入陕西烟草的有翅桃蚜和棉蚜为 CMV、TEV、PVY三者的共同介体 ,萝卜蚜是 CMV及PVY的介体。迁入烟田的有翅蚜有 2个迁飞高峰 ,呈双峰曲线 ,第 1高峰期出现在 5月中旬至 5月底 6月初 ,此次迁飞高峰期的有翅桃蚜量与大田发病率呈显著正相关 ;第 2高峰期在 6月上旬末至 6月中旬 ,此次迁飞的有翅蚜量与田间发病率关系不大。大田烟草蚜传病毒病发生有一个急剧上升期 ,大约在有翅蚜迁入烟田第1高峰期后 1 0 d左右 ,以后发病率平缓上升。以陕西长武 1 984～ 1 998年的烟草病情资料、相关资料及当地气象资料 ,建立了烟草蚜传病毒病病情指数预测预报模型 ,回归测验结果表明历史符合率达 96.0 5%以上
The results showed that the primary source of tobacco aphid-borne virus disease in Shaanxi tobacco mainly came from the local winter oilseed rape fields. The winter rapeseed poisoning accounted for 87.36% of the total overwintering virus. Tobacco cucumber mosaic virus (CMV), tobacco etch virus (TEV) and potato virus Y (PVY) are the main groups of tobacco aphid-borne viruses. The winged Myzus persicae and cotton aphid that moved into Shaanxi tobacco were common mediators of CMV, TEV and PVY. Radish aphid was a mediator of CMV and PVY. The winged aphid moved into the tobacco field has two migratory peak, showing a bimodal curve, the first peak appeared in mid-May to late May early June, the peak of the relocation of winged Myzus persicales and field incidence The second peak was in late June to mid June, and the amount of winged aphid migrating had little to do with the incidence in the field. The tobacco aphid-borne virus disease in the field has a sharp rise period, about a dove aphids moved into the first peak of tobacco fields about 10 days later, the incidence increased slowly. Based on the tobacco disease data, relevant data and local meteorological data of tobacco from 1986 to 1998 in Changwu County of Shaanxi Province, the prediction model of disease index of tobacco virus-transmitted virus disease was established. The regression test showed that the historical coincidence rate reached 96.0 5%