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根据10个样地100株粟树8452茶果枝剪枝标实象（CyllorhynchitesursulusRoelofs）为害状调查数据，分析为害状的空间分布格局。结果显示：东、南、西、北四个方向为害程度差异不显著。树枝顶部为害程度显著低于下部各个方向，达1．05倍。样地间差异也达到极显著水平，而且这种差异与样地的管理水平相一致。该种群为害状空间分布的基本成份为个体群，总体为聚集分布。用Iwao回归法分析，得出理论最适抽样数（n）回归式为：n=（1.67／X＋0．07）／D2，式中X为粟枝平均被害率，D为允许误差。在防治指标定为果枝被害率10％时，序贯抽样的累积被害率上下限（T’（0））为：T’（0）=10×9．54×。每平方米土壤虫口密度和树上虫口密度相关性式为：Y＝3．9883×P－0．3016，相关系数为0．95。式中Y为P分别为剪枝粟实象树上成虫密度与土壤中幼虫密度。这说明可用土壤中幼虫密度估计成虫密度。
According to the survey data of the damage of 8452 tea tree branches of 10 poplar trees in 10 plots, the spatial distribution pattern of the damage was analyzed. The results show that there is no significant difference in the degree of damage in the four directions of east, south, west and north. The degree of damage at the top of the branches was significantly lower than that in the lower part by 1.05 times. The differences between the plots have also reached a very significant level, and this difference is consistent with the management level of plots. The basic components of the spatial distribution of pest damage in this population are individual groups, which are aggregated in general. Iwao regression analysis shows that the theoretically optimal sampling number (n) regression equation is: n = (1.67 / X +0.07) / D2, where X is the average rate of Sugu injury, D is the allowable error. When the control index is 10%, the upper and lower limit of cumulative damage rate (T ’(0)) is: T’ (0) = 10 × 9.54 ×. The correlation between the population density of insect pests per square meter and the population density of trees was Y = 3.9883 × P-0.3016 and the correlation coefficient was 0.95. Where Y is P, respectively, pruning poplar tree adult density and soil larvae density. This shows that the density of adult larvae in soils can be estimated.