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本文认为用二阶原点除害法清理松材线虫病死树能取得次年病死树防治效果（减退率下降５３．２％），部分林地防治无效是由于防治质量差、松林火灾、人为传播和自然传播因子所致。
This paper argues that the second-order origin decontamination method can be used to control the dead tree of pine wood nematode to get the control effect of the dead tree in the following year (the rate of decline is decreased by 53.2%). The ineffectiveness of some of the forestland prevention and control is due to poor quality of control, pine fire, Communication factors.