松纵坑切梢小蠹为害红松的调查与分析

以红松人工纯林为对象,调查分析松纵坑切梢小蠹对其为害的程度及造成的损失。结果表明：该虫致使树木死亡的损失较小,重灾林分在连续为害第三个年度时,平均虫死率为0.24%;对活立木生长影响显著,重灾林分平均每年每公顷立木材积损失量为1.446 m^3,与对照相比较,损失率为16.9%;对球果产量的影响极其显著,轻、中、重度及重灾林分平均球果的损失率分别达到8.8%、46.9%、66.5%、81.7%。

The investigation and analysis of Blastophagus piniporda pest to Pinus koraiensis

The damage degree and loss of pure Pinus koraiensis forest due to Blastophagus piniporda were investigated and analyzed. The results showed： the death rate of trees resulted from this pest were sinall, ordy 0.24% for the heavy infected forest in the third year. The effect of this insect pest to standing trees was significant, as the loss of volume was 1.446m^3 per year per ha., which is the 16.9% loss compared with the control. The product of cones was also decreased by 8.8%, 46.9%, 66.5% and 81.7% in the light, medium, heavy and intensively heavy infected forests.