营林措施控制城市公园松突圆蚧危害

通过对发生区内松林进行间伐、修枝等营林措施将松林的郁闭度调整至0.5左右。试区试验结果松突圆蚧的虫口密度从采用营林措施前的2.61头/束下降至0.63头/束,虫口密度下降75.86%,在城市公园规划设计上还应考虑位于不同的坡向营造不同的树种,以防止松突圆蚧的发生和危害。  

Control of Forest Tending Operations to the Harm of Pine Scale (Hemiberlesia pitysophila Takagi) in Urban Park

The change of the pine scale (Hemiberlesia pitysophila Takagi) population density on pine forest of urban park between the treatment (forest tending operations) and ck (no forest tending operations) was researched in this paper. The results were shown as follows: the population density of pinescale on the pine woods of urban park declined to 0.63 head per bundlefrom 2.61 head perbundle when the crown density of pine in urban park had become 0.5 or so by means of cultivation activities such as felling, pruning and thinning and so on, and the drop got to 75. 86 percent; The pinewoods would soon get revived once using these cultivation activities, so the forest tending operations was the mainmeasures controlling the harm of Pine Scale in Urban Park; At the same time, the population density of pine scale on pine woods in the sunny slope was more than that in the somber slope and it had become less and less from sunny slope to somber slope, therefore the tree species must be considered in the planning and design of urban park for preventing the harm and happening of the pine scale.