海南玉米田入侵草地贪夜蛾幼虫的空间分布型  

Spatial Distribution of Spodoptera frugipera Larvae in Corn Fields of Hainan Province

作　　者：刘诗颖 孙明凯 李金花 张业扬 李涛 陈剑山 范咏梅[1,2] LIU Shiying;SUN Mingkai;LI Jinhua;ZHANG Yeyang;LI Tao;CHEN Jianshan;FAN Yongmei(College of Plant Protection,Hainan University/Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests by the Ministry of Education,Haikou 570228,China;Plant Protection General Station of Hainan Province,Haikou 570100,China)

机构地区：[1]海南大学植物保护学院/热带农林生物灾害绿色防控教育部重点实验室,海南海口570228 [2]海南省植物保护总站,海南海口570100

出　　处：《广东农业科学》2021年第2期108-115,共8页Guangdong Agricultural Sciences

基　　金：国家救灾专项基金(HD-KYH-2019134,HD-KYH-2020133)。

摘　　要：【目的】分析草地贪夜蛾Spodoptera frugiperda(J.E.Smith)幼虫在海南省玉米地的空间分布状况。【方法】利用6种空间分布型聚集度指标、Taylor的幂法则和Iwao m^(*)-m回归法分析草地贪夜蛾低龄(1~2龄)、中龄(3~4龄)和高龄(5~6龄)3个龄期幼虫在海南岛的空间分布。【结果】草地贪夜蛾幼虫的空间分布主要与海南地区玉米种植制度、幼虫龄期及气候差异相关。苗期、小喇叭口期和大喇叭口期受害率相对较高,三龄幼虫占比最高,成聚集分布;开花期和成熟期多为5~6龄幼虫,成均匀分布状态。从区域分布来看,在海南省东部和中部的玉米田中该害虫幼虫为聚集分布,在南部和北部地区的玉米田中,呈均匀分布(I>0,C>1,K>0,Cα>0,m^(*)/m>1,α>0,β>1,lgα>1,b>1)。根据Taylor幂法则lg v=0.23663+1.24689 lg m(R=0.9437)及线性回归方程m^(*)=-0.07870+2.16842m(R=0.7777)对各田块数据进行分析,得出害虫在海南各地区整体呈现为聚集分布且聚集度不依赖于种群密度的特征。【结论】研究结果对草地贪夜蛾种群密度调查和防治适期选择具有指导作用。【Objective】The study was conducted to analyze the spatial distribution of Spodoptera frugiperda(J.E.Smith)larvae in corn fields of Hainan Province.【Method】Six aggregation indexes,Taylor power law and Iwao m^(*)-m regression method were used to analyze the spatial distribution of S.frugiperda larvae in three stages:low age(1st-2nd instar),middle age(3rd-4th instar)and old age(5th-6th instar)in Hainan Island.【Result】The spatial distribution of S.frugiperda larvae was mainly related to corn planting system,larval instar and climate in Hainan.It was damaged seriously in seedling stage,small bell stage and big bell stage.The proportion of 3rd instar larvae was the highest,and they were distributed in aggregation.The 5th-6th instar larvae distributed evenly in flowering and mature stages.From the perspective of regional distribution,the S.frugiperda larvae were concentrated and distributed in the eastern and central parts of Hainan Province,and evenly distributed in the southern and northern parts(I>0,C>1,K>0,Cα>0,m^(*)/m>1,α>0,β>1,lgα>1,b>1).The data of each field were analyzed according to Taylor power law lg v=0.23663+1.24689 lg m(R=0.9437)and linear regression equation m^(*)=-0.07870+2.16842m(R=0.7777),and it could be concluded that the pests in each area of Hainan showed an aggregated distribution and the aggregation degree was not dependent on the population density.【Conclusion】The research result will provide references for the investigation of population density and selection of appropriate period of pest control.

关 键 词：草地贪夜蛾 玉米 海南 空间分布 种植制度 幼虫龄期 

分 类 号：S433.4[农业科学—农业昆虫与害虫防治]