【目的】 二斑叶螨Tetranychus urtica广泛分布于世界各地的温带和亚热带地区，是一种世界范围内的重要农业害虫，其寄主广泛，能为害果树、蔬菜、花卉等上千种植物。危害时，幼螨和若螨通过吸食植物茎叶部汁液使叶肉细胞失水坏死，严重时造成叶片枯黄、脱落，影响农作物的品质，严重发生时常带来较大的损失。本研究明确了二斑叶螨在苹果树上的分布特征及空间格局，旨在为二斑叶螨的科学防治提供参考依据。【方法】 采用聚集度指标法，Iwao m*-m模型和Taylor幂法则模型，研究二斑叶螨在苹果园的分布特征及空间格局。【结果】 建立Taylor幂法则模型，结果显示二斑叶螨整体上呈聚集分布（a = 0.913 1 < 1，b = 1.806 4 > 1，m ≠ 1，C > 1）。在苹果树东、南、西、北4个方向空间分布型均为聚集分布，在针对东、南、西、北4个方向二斑叶螨拟合的回归方程中，a分别为0.593 9、0.593 2、0.617 6和0.603 5，b分别为1.652 5、1.653 1、1.839 7和1.944 4，而扩散系数C分别为5.20、2.04、3.81和3.37。Iwao m*-m回归模型显示二斑叶螨整体上呈聚集分布（α =﹣1.033 9 < 0，β =1.841 4 > 1），在东、南、西、北4个方向也均呈聚集分布。Taylor幂法则模型在针对上、中、下3层二斑叶螨拟合的回归方程中，a分别为0.691 3、0.786 1和0.739 8，b分别为1.845 5、1.738 2和1.858 7，而扩散系数C分别为7.10、9.28和10.05。二斑叶螨在果树上、中、下3层的Iwao m*-m回归模型显示二斑叶螨整体上呈聚集分布（α =﹣1.059 8 < 0，β = 1.824 0 > 1），在上、中、下3层也均呈聚集分布。【结论】 二斑叶螨在苹果树东、南、西、北4个方向和上、中、下3层呈聚集分布，平均虫口密度无显著差异。

 [Aim]   To investigate the occurrence and spatial distribution of Tetranychus urtica in apple trees. [Methods]  The concentration index method, the Iwao m*-m model and the Taylor power law model, were used to investigate the distribution characteristics and spatial patterns of the T. urtica in apple orchards. [Results]  A Taylor power law model was established, revealing that the T. urtica has an overall clustered distribution (a = 0.913 1 < 1, b = 1.806 4＞1, m ≠ 1, C > 1). Aggregated distribution patterns were observed in all four cardinal directions (east, south, west, north) around apple trees. In regression equations fitted for these four directions, the a values were 0.593 9, 0.593 2, 0.617 6, and 0.603 5, respectively, with b values of 1.652 5, 1.653 1, 1.839 7, and 1.944 4, respectively. The diffusion coefficients (C) were 5.20, 2.04, 3.81, and 3.37, respectively. The Iwao m*-m regression model also indicates that T. urtica has an overall clustered distribution (α =﹣1.033 9 < 0, β = 1.841 4 > 1), with clustering also observed in the east, south, west, and north sectors of apple trees. The Taylor power law model fitted regression equations for upper, middle, and lower canopy layers yielded coefficients of 0.691 3, 0.786 1, and 0.739 8 respectively, with b values of 1.845 5, 1.738 2, and 1.858 7, and diffusion coefficients (C) of 7.10, 9.28, and 10.05. The Iwao m*-m regression model for T. urtica across the upper, middle, and lower tiers of fruit trees indicated an overall clustered distribution (α =﹣1.059 8 < 0, β = 1.824 0 > 1), with clustering observed across all three tiers. [Conclusion]  T. urtica has a clustered distribution in apple trees irrespective of aspect or canopy level, with no significant variation in average population density.