论文部分内容阅读
通过对样子松的结实量与树龄的关系作的分析,对樟子松梢小卷蛾幼虫蛀食樟子松的花、芽和2年生球果,造成的樟子松结实量的损失作了估计,提出了种子的损失率公式:Z=(4.017+(1+k)I)x;防治密度指标为:x=Q/97.47×[4.017+(1+k)I]R。进而得出化防密度指标为0.34%,生防密度指标为0.70%。
Based on the analysis of the relationship between the seed yield and age of Pinus sylvestris, the loss of Pinus sylvestris var. Sylvestris caused by the Pinus sylvestris var.mongolica larvae ’s feeding on the flowers, shoots and 2 - year - old cones of Pinus sylvestris var. It is estimated that the loss rate formula of seeds is proposed: Z = (4.017 + (1 + k) I) x; the control density index is: x = Q / 97.47 × [4.017+ (1 + k) The results showed that the anti-density index was 0.34% and the bio-density index was 0.70%.