亚麻蚜防治指标研究

Study on Control Threshold of Yamaphis yamana Chang

采用盆栽网罩的方法,分别在现蕾期和开花期人工接虫,研究了亚麻蚜的虫口密度与产量损失率之间的关系和防治指标。结果表明:现蕾期,产量损失率(y)与百株虫量(x)的关系为y=16.53lnx-117.5,相关系数(R2)为0.883;开花期,产量损失率(y)与百株虫量(x)的关系为y=19.87lnx-131.5,相关系数(R2)为0.813,二者相关性极显著。按照防治的直接收益与直接成本,确定了这2个生育时期亚麻蚜的防治指标,现蕾期的防治指标为900～1 200头/百株,开花期的防治指标是1 500～2 000头/百株。

By artificially modifying the density of Yamaphis yamona Chang in budding stage and flowering stage,the correlation between population density of Yamaphis yamaha Chang and yield loss rate and control threshdd were studied by using potting-net mask method.The results showed that a correlative formula between population density of Yamaphis yamaha Chang per 100 stems（x） and yield loss rate of flax（y） was respectively expressed as y=16.531nx-117.5 ,y= 19.871nx- 131.5 in budding and flowering srage ,its correlation coefficient （R2） was 0.883,0.813 respectively.The economic threshold of controlling Yamaphis yamaha Chang at various flax fields were determined, namely 900-1 200 aphids per 100 stems in budding stage, 1 500-2 000 aphids per 100 stems in flowering stage.