豆天蛾田间饲养量及效益研究

通过对豆天蛾在田间笼罩条件下的饲养调查观察 ,测定出其幼虫食叶量、食叶率 ,从而计算出每平方米豆田的理论养虫量 ,实际适宜养虫量及对大豆产量损失的影响。笼罩条件养虫量 (x)与食叶率(y1)回归方程 :^y1=2 2 0 + 2 4 1x± 2 874 9,r1=0 9971 ;笼罩条件养虫量 (x)与产量损失率 (y2 )回归方程 :^y2 =1 5 7+ 0 4 2 5x± 0 6 837,r2 =0 994 6 ;笼罩条件养虫量 (x)与结荚损失率 (y3 )回归方程 :^y3 =1 5 7+ 0 33x± 1 785 4 ,r3 =0 94 6 8 。在幼虫饲养量为 1 0～ 1 5头 m2 时 ,综合效益比一般豆田每 6 6 7m2增收 4 73 6元以上。

Rearing Clanis bilineata in soybean field and its profit.

The theory number and actual appropriate rearing number of Clanis bilineata Walker and the rearing on soybean yield loss caused by this insect were calculated through detection of leaf feeding amount and leaf feeding rate in cage.In caged condition it showed that there were significant positive correlation between rearing number(x) with leaf feeding rate(y-1),pod loss rate (y 2),and yield loss rate (y-3).The regression equations and correlation coefficients of them were: 1=2.20+2.41x±2.8749,r-1=0.9971  ; 2=1.57+0.425x±0.6837,r-2=0.9946  ; 3=1.57+0.33x±1.7854,r-3=0.9468  .When the rearing number were 10～15 per m+2,the profit per 667m+2 was 473^6 yuan which was higher than that of the only soybean planting.