重庆地区柑桔园束管食螨瓢虫(stethorus chengi)各虫态及种群在树冠上的分布以外层较多,内层较少,上层较多,中下层较少,在东南西北四个方位上无明显的差异。在树冠间各虫态及种群在主要发生期(5～10月)均以个体群的形成而成聚集分布。其聚集原因,在低密度时(约<3头/树)为外界因素引起,在高密度(<3头/树)时是外界因素和自身聚集行为共同作用的结果。抽样方式的比较表明单对角线、双对角线、棋盘式、平行跳跃、“Z”字形以及5点式抽样均可作为束管食螨瓢虫的抽样方法。其结果无显著差异。 In Chongqing, citrus orchard tube-steamed bugs (Stethorus chengi) had more outer layers, fewer inner layers, more upper layers and fewer middle and lower layers. There is no obvious difference. The canopies in the canopy and population in the main period of occurrence (May to October) were formed by the formation of individual clusters and distribution. The reason for its aggregation is caused by external factors at low density (about 3 heads / tree) and the combination of external factors and self-aggregation at high density (<3 heads / tree). Comparison of sampling methods showed that single diagonal, double diagonal, checkerboard, parallel jump, “Z” and 5-point sampling could all be used as a sampling method for ladybugs. The results no significant difference.