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刺桐姬小蜂Quadrastichus erythrinae Kim是重要外来入侵害虫,危害刺桐属多种植物。本文调查研究了金脉刺桐嫩枝上刺桐姬小蜂虫瘿的数量分布和空间格局。结果显示,金脉刺桐嫩枝上靠近生长点(芽头)一端刺桐姬小蜂虫瘿数量较多,15 cm以内占90%以上,距离越远越少,其虫瘿数量比率(Y)和枝条长度(X)关系方程为Y=72.577e-0.138X。对频次分布的分析结果显示,刺桐嫩枝上虫瘿主要以虫瘿集体形式出现。获得的虫瘿空间格局主要参数平均拥挤度M*、丛生指数I、聚块性指数M*/M等均显著大于1,表明虫瘿是聚集分布且聚集程度较强。建立的Iwao M*-M方程为M*=1.75+3.51M、Taylor幂函数法则模型为lg s2=0.554+1.828lgx珋。
Quadrastichus erythrinae Kim is an important invasive pest that endangers various species of Erythrina. In this paper, we investigated the population distribution and spatial pattern of Bursaphelenchus xylophilus on the branches of Juglans mandshurica. The results showed that the number of stinkbug beetles on the shoots near the growing point (bud head) was higher than that on the shoots (more than 90% within 15 cm), and the number of stinkbugs (Y ) And the branch length (X) the relationship equation is Y = 72.577e-0.138X. The analysis of the frequency distribution showed that the insects on the twig of jacaranda were mainly in the form of insects. The main parameters of spatial pattern obtained were the average crowding degree M *, cluster index I, and bulk index M * / M, which were all significantly greater than 1, suggesting that the galls were aggregated and strongly aggregated. The established Iwao M * -M equation is M * = 1.75 + 3.51M and Taylor’s law of power law is lg s2 = 0.554 + 1.828lgx 珋.