| Asian Longhorned Beetle (Anoplophora glabripennis) is a wood-boring beetle. It outbreaks seriously and caused great damage in the artificial shelter-wood plantations of the Three-Northern Areas. The Great Spotted Woodpecker (Picoides major) is one of the natural predators and important biological control agent of A. glabripennis. The P. major is common to Wulate Qianqi County of Inner Mongolia Autonomous Region and widely distributes in the artificial Shelterwood Plantations. The wood-boring were the important foods of the P. major, especially in the winter.From 2006 to 2008, the predatory of P. major on A. glabripennis was studied by the trace investigation and sample plot investigation in field. Fifteen study sites were selected. The result showed that the function response of P. major to A. glabripennis was HollingШ, with a non-linear regression equation N e = exp(4.323 ? 39.758/ No). Within certain density range, the predation capacity would increase with the increasing of density of A. glabripennis. When the density of A. glabripennis increased, the predatory capability has a positive acceleration phase, then a negative acceleration phase and a saturation state in the end. As the density increasing of A. glabripennis, the predation rate increased at first, and then it has a peak, reduced in the end, with a non-linear regression equation The result showed that numerieal resPonsewas PositiVe density resPonse.The PoPulation density of P.major would increase with the increase ofdensity ofA.glabriPennis.The feeding hablts of the P major were surveyed by field observations and trace eheeking from2005 to 2007,in WUlate Qianql County.The woodPeeker Pe而rmed fourteen tyPes of foraglng techniques. Pecking and hammering were most common in winter; gleaning and probing were most common at the time of high food availability at the trunk and tree branches during the breeding season and in summer. The woodpecker gleans arthropods and insect larvae in the breeding season and summer, seeds and nuts mainly in the winter and pokes holes for sap-sucking in winter. The main diet consisted of arthropods and plant seeds. The diet was significantly different in different seasons. The Great Spotted woodpecker primarily consumes defoliators and the food on tree trunks from March to October. The contribution of wood borers to the diet was higher in winter, lower in the breeding season and summer. The proportion of the food on ground was small in the breeding season and high in the summer and winter.From 1999 to 2007, the population density of P. major and A. glabripennis was studied by the trace investigation, line transect method and sample plot investigation in field. The Wulate Qianqi County divided into 111 square grids. The GPS was used to map distribution. The result showed that the population of P. major increased and the population density of A. glabripennis declined during the past 9 years. In the Hetao area, the population density of P. major increased while the population density of A. glabripennis increased from 1999 to 2002 and then declined from 2002 to 2007. The population of P. major was stable while the population density of A. glabripennis declined from 1999 to 2007, in the Qianshan area.The conclusions are as follows.①The feeding habits and feeding behavior of the P. major were changed with habitat environment and food resources of different season. The control effects of P. major to A. glabripennis in winter was better than that in other seasons.②The population density of P. major could be stabilized and increased by artificial attracting P. major.③The control of P. major to A. glabripennis had the time following effect, but was hysteretic nature. Therefore, A. glabripennis caused great losses to the forest easily at the early stage.
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