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采用人工接虫法,探讨了不同密度菜青虫对春甘蓝产量的影响。结果表明,菜青虫百株虫量(x)与甘蓝产量(y)呈显著负相关,相关式为y=165.8904—0.0385x(r=-0.9902)。通过五种曲线模拟及回归分析,得出了虫口密度与甘蓝产量损失率()之间的关系为幂函数,即=0.0208x~(1.0057)(r=0.9961)。提出了豫南地区甘蓝菜青虫防治指标为百株虫量55头。
The effects of different density of Pieris rapae on the yield of spring cabbage were explored by artificial insects. The results showed that there was a significant negative correlation between the number of cabbage caterpillars (x) and the yield of cabbage (y), the correlation was y = 165.8904-0.0385x (r = -0.9902). Through the five curve simulations and regression analysis, the relationship between the population density and the loss rate of cabbage () was found to be power function, that is, = 0.0208x ~ (1.0057) (r = 0.9961). The control index of Brassica campestris in southern Henan is 55 insects per hundred.