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一过去,高粱蚜虫是一种间歇性、突发性的害虫,一般是隔几年大发生一次。但是,我省自1961年以来,不仅连年严重发生,而且面积逐年加大,为害逐年加重。1965年是十年来发生面积最大的一年。近几年高粱蚜虫连年猖獗的主要原因,是高温、干旱的气候条件适宜。据十年来的调查资料分析,6月上旬,当蚜虫由越冬寄主迁入高粱田内之后,持续两旬的平均气温在22℃以
In the past, the sorghum aphid was an intermittent, sudden pest that usually occurred every few years. However, since 1961, our province has not only gravely occurred in successive years, but also its area has been increasing year by year, causing increasing harm each year. 1965 is the largest area in ten years. In recent years, the main cause of the successive years of sorghum aphids is high temperature and arid climatic conditions are appropriate. According to the survey data from the past decade, in early June, when the aphids were moved by the wintering host into the field of sorghum, the average temperature for the last two decades was at 22 ° C