【摘要】 通过全面调查4块不同立地条件下的扁桃(Amygdalus communis L.)标准地,针对香梨优斑螟(Euzo-phera pyriella Yang)在扁桃上的危害特点进行分析,并采用5种不同的判断空间分布格局的聚集度指标法和Iwao、Talor等回归分析法对香梨优斑螟的空间分布型进行了研究。结果表明,香梨优斑螟的发生程度与树龄、树体部位之间有密切关系,危害程度随树龄增大而加重,最高有虫株率达82.4%,危害部位主要集中在侧枝和主枝,以侧枝居多,最高有虫株率达54.01%。香梨优斑螟幼虫的空间分布为聚集型,并且分布的基本成分为个体群,个体间相互吸引。根据Iwao方法确定了香梨优斑螟幼虫在不同密度下的最适抽样数公式为m*=2.868 74+1.704 18m。更多还原

【Abstract】 The purpose of this paper is to analyze the harmful characteristic on Euzophera pyriella Yang in Amygdalus communis L.by four different Amygdalus communis L.,spots and study the spatical distribution pattern of Euzophera pyriella Yang by five more ways,such as gathering type target,Iwao,Talor.The result of investigation shows that there are close relationships between occurrence extent with the age of the Amygdalus communis L.and the positions where there is harmful Euzophera pyriella Yang,the harmfulness will get more serious with the increasing of the age of the tree,the highest damaged rate is up to 82.4%.the main harmful positions damaged by Euzophera pyriella Yang are lateral branch and main branch,especiall the lateral branch,the most serious harmfulness can get to 54.01%.The result proves that the spatical distribution pattern of the Euzophera pyriella Yang’s larva is gathering type,and the basic composition distributed are individuals that attracts each other.According to Iwao’s method,it is certained that the most suitable sample-date formula is m*=2.868 74+1.704 18 m under different density of Euzophera pyriella Yang’s larvae.更多还原