松纵坑切梢小蠹防治指标、经济阈值及空间分布型的研究

Study on Control Idex, Economic Threshold Value and Space Distribution of Tomicus piniperda

通过定时定位观察云南松松纵坑切梢小蠹危害程度与云南松经济损失之间的关系，经统计分析，确定松纵坑切梢小蠹的防治指标为：平均虫孔数０．１８９虫孔／株，林木平均枯死率０．５２％，平均株枯梢率４．７４％，有虫株率５．１４％。确定昆明地区方旺林场的经济阈值为０．２１５１虫孔／株；并制订了适合于基层林区的多个动态经济阈值。当虫孔密度达到０．３３３８×ＣＣ÷（Ｙ×ＥＣ×Ｐ），对应的林木平均枯死率为０．３８９＋０．３６６７×ＣＣ÷（Ｙ×ＥＣ×Ｐ）、平均株枯梢率为５．５３９８＋１．１３０１×ＣＣ÷（Ｙ×ＥＣ×Ｐ）、平均有虫株率为１．６３＋１４．４８２１×ＣＣ÷（Ｙ×ＥＣ×Ｐ）时，防治投入与挽回经济损失相等，应进行防治。

According to the investigation on the relationship between the damaged extent and economic loss in Pinus yunnanensis damaged by Tomicus piniperda, the index to control Tomicus piniperda were determined as following: the average number of pest hole is 0.189 hole/plant, the average rate of dead tree is 0.52%,the average rate of withertop is 4.74%,the damaged tree rate is 5.14%. The economic threshold value of Fangwang forest farm in Kunming district has been determined as 0.2151 hole/plant, the different economic threshold value suitable for forest district at the basic level have been drawn up. When the pest hole density reached 0.3338×CC÷(Y×EC×P), the average rate of dead tree is 0.389+0.3667×CC÷(Y×EC×P), and the average rate of withertop is 5.5398+1.1301×CC÷(Y×EC×P), the damaged tree rate is 1.63+14.4821×CC÷(Y×EC×P), the input of control is equal to the economic losses.