<FONT face="Verdana">Analysis on the Causes of Recent Outbreaks of Cnaphalocrocis medinalis in Nanning, China</FONT>

WANG Feng-ying,HU Gao,CHEN Xiao,SHEN Hui-mei,LUO Shan-yu,XIN De-yu,XU Sheng-gang,ZHANG Xiao-xi,ZHAI Bao-ping

doi:10.3969/j.issn.10017216.2009.05.14

Chinese Journal OF Rice Science >

2009 , Vol. 23 >Issue 5: 537 - 45

DOI: https://doi.org/10.3969/j.issn.10017216.2009.05.14

研究报告

Analysis on the Causes of Recent Outbreaks of Cnaphalocrocis medinalis in Nanning, China

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¹Key Laboratory of Monitoring and Management of Plant Diseases and Insect Pests, Ministry of Agriculture/Department of Entomology, Nanjing Agricultural University, Nanjing 210095, China; ²Institute of Plant Protection, Guangxi Academy of Agricultural Sciences, Nanning 530012, China; ³Guangxi Plant Protection Station, Nanning 530012, China; 4Nanning Plant Protection Station, Nanning 530012, China; *Corresponding author, E-ail: bpzhai@njau.edu.cn

Received date: 1900-01-01

Revised date: 1900-01-01

Online published: 2009-09-10

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Abstract

The population feature and source areas of the rice leaffolder, Cnaphalocrocis medinalis (Guenée) on earlyseason rice in Nanning, Guangxi Zhuang Autonomous Region, China were studied through systematic field survey, dissection of female ovarian, trajectory analysis, synoptic analysis and historical data analysis. The results indicated that the possible source areas of the major immigrant populations of C. medinalis in Nanning, China in 2007 were the northern parts of Vietnam, and the northern and central parts of the Laos and Thailand. The amount and date of the spring immigration in AprilMay and autumn return migration and their relationships with rainfall and rainy days between 1970-1980 and the recent years after 2000 were compared. It was found that the enormous increase of the spring immigrants of C. medinalis and earlier appearance of the autumn return immigration were the main causes for the consecutive outbreaks and serious damages after 2003. There were no relationships between the spring immigration and the autumn return migration, neither on its amount nor the date.

Key words： Cnaphalocrocis medinalis; ovarian dissection; population status; migratory trajectory

Cite this article

WANG Feng-ying,HU Gao,CHEN Xiao,SHEN Hui-mei,LUO Shan-yu,XIN De-yu,XU Sheng-gang,ZHANG Xiao-xi,ZHAI Bao-ping . Analysis on the Causes of Recent Outbreaks of Cnaphalocrocis medinalis in Nanning, China[J]. Chinese Journal OF Rice Science, 2009 , 23(5) : 537 -45 . DOI: 10.3969/j.issn.10017216.2009.05.14

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