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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2016年53 No.2

Population dynamics of the diamondback mothin Tonghai, Yunnan
Author of the article:ZHAO Xue-Qing1** YIN Yan-Qiong1 CHEN Ai-Dong1*** MU Wei-Dong2 LI Xiang-Yong1 HUANG Chun-Fen2 A
Author's Workplace:1. Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 560205, China; 2. Tonghai County Plant Protection and Quarantine Station, Tonghai 652700, China
Key Words:Plutella xylostella, population dynamics, temperature, rainfall, planting system,Tonghai county
Abstract:

      [Objectives]  To understand the regional occurrence of the diamondback moth and the effects of temperature, rainfall patterns and cropping planting systems on the population dynamics of this species in Tonghai County, Yunnan. [Methods]  Field surveys were conducted for five consecutive years between 2009 and 2014, using sex pheromone monitoring and other survey methods to quantify adult, and larval, populations dynamics, and the effects of monthly mean temperature, monthly rainfall and cropping patterns on the abundance of adults and larvae were analyzed. [Results]  (1) The adult population fluctuated significantly between 2009 and 2014. A single, major peak of abundance occurred from February to November in all years, although some years also had 2-3 small population peaks. The highest abundance was recorded in 2012, in which the onset of the peak period advanced to April, and which was significantly higher than abundance recorded in July-August 2013. Population sizes in 2010 and 2011 were relatively small, < 100/pot (card)/month; (2) Larvae were present in every month of the year in all years, each of which had 2-3 peak periods of larval abundance with April to June being the main peak period with a smaller peak from September to November. The larval population peak occurred 20 -30 days after the peak in adult abundance, but fluctuations in the adult and larval populations were basically the same throughout the year; (3) The size of the adult population was significantly correlated with both temperature (r = 0.442), and rainfall, (r = 0.283), but the degree of correlation was weak. Larval abundance was significantly correlated with temperature (r = 0.530), but not rainfall (r = 0.125). Larval and adult abundance were positively correlated with each other (r = 0.253), but the strength of correlation was weak. [Conclusion]  The year-round planting of cruciferous vegetables promotes high diamondback moth numbers and consequently increased crop damage. This regional planting pattern is one of the main reasons for the frequent, serious crop damage caused by the diamondback moth in Tonghai County.

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