为害云南松的纵坑切梢小蠹(Tomicus piniperda)经济阈
值的研究
陈方;孙绍芳;郭盘江;杨翠莲;张智涌
【期刊名称】《中国昆虫科学：英文版》 【年(卷),期】2001(008)003
【摘要】By careful and long period field investigation of the population density of Tomicus piniperda L. and the growth of Yunnan pine ( Pinus yunnanensis Franch. ), and improved regression analysis, the economic threshold of Tomicus piniperda on Yunnan pine is determined: When the death rate of the trees is not more than 0.52 %, the nat ural control factors can prevent the density of the bark beetle from increasing and no control measure is needed. When the death rate of the trees reaches 0. 5 %, the corresponding rate of shoots attacked is 0.61% and the mean of invad ing holes per tree 0.66, the cost for control is equal to the economic loss saved. So, considering both the economic justification and the prevention of the pest density from increasing, when the death rate of the trees is more than0.5%, the corresponding rate of shoots attacked more than 0.61% and the mean of invading holes per tree more than 0.66, control measure should be taken. The paper also gives formulae for different Yunnan pine forest areas to calculate their own economic threshold according to their special situations.%经过对纵坑切梢小蠹(Tomicus piniperda L.)种群密度和云南松
为害云南松的纵坑切梢小蠹(Tomicus piniperda)经济阈值的研究
