川西平原位于长江上游,与中下游地区比较,油菜病毒病的流行,在与品种抗病性,与油菜播种期,与传毒蚜虫迁飞量,与秋季油菜苗期气候等因素的关系方面,都具有相似性;但从病害发生程度而言,一般不及长江中下游地区严重。以什邡县1981—1985年的调查资料为例,年平均发病率为0.4—6.5％,总平均为2.6％明显轻于中下游地区(以芜湖为例,同 The western Sichuan plain is located in the upper reaches of the Yangtze River. Compared with the middle and lower reaches, the prevalence of rape virus disease is closely related to the disease resistance, rape sowing date, All have similarities; but from the degree of disease occurrence, it is generally not as serious as the middle and lower reaches of the Yangtze River. Take the survey data of Shifang County from 1981 to 1985 as an example, the annual average incidence rate is 0.4-6.5%, with a total average of 2.6%, which is obviously lower than that in the middle and lower reaches (for example, Wuhu