Population dynamics and migration characteristics of the small brown planthopper in spring in Jining,Shandong Province
2011; Taylor & Francis; Linguagem: Inglês
ISSN
0452-8255
Autores Tópico(s)Plant Parasitism and Resistance
ResumoThe population dynamics and generation structure of the small brown planthopper(SBPH) in wheat and rice seedling fields in Jining,southwest Shandong Province,China,were studied through systematic field survey and the dissection of the ovaries of macropterous females.Grads and ArcGIS were used to analyze weather conditions during the immigration peak detected on the 7th of June 2009 and the emigration peak detected on 15th of June 2010.The migration pathways of SBPH were simulated in the above two periods by HYSPLIT,trajectory analysis software for the simulation of migration trajectories.The main results are as follows:(1) Peak immigration of SBPH in Jining was concentrated on the 7th and 8th June 2009,and the 3rd to 7th of June 2010 whereas the emigration peak was concentrated on the 2nd to 4th and 9th of June 2009 and the 8th and 15th to 18th June 2010.(2) Backward trajectory analysis showed that the source regions of the immigrant populations observed on the 7th of June 2009 were mainly in Shuyang and Sihong County,in Suqian,northern Jiangsu,and Danyang in southern Jiangsu,while forward trajectory analysis showed that SBPH may emigrate from Jining to the Mongolian Autonomous County of Harqin Left Wing,Zhaoyang,western Liaoning,the junction of Dalian and Dandong and Gangwon-do in North Korea on the 15th of June,2010.(3) Heavy precipitation appear to be the main factors affecting SBPH settlement during immigration or emigration;settlement areas were on the edge of the main rainfall zones.
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