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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2019年56 No.6

Population dynamics and factors influencing the abundance, of Plutella xylostella L. in northeastern Yunnan
Author of the article:ZHAO Xue-Qing; MA Yong-Cui;YIN Yan-Qiong; LI Xiang-Yong;MA Yong-Qiong; YANG Yi-Juan;WANG Qin;CHEN Ai-Dong
Author's Workplace:Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming 650205, China; Station of Plant Protection of Zhaotong City, Zhaotong 657100, China
Key Words:Plutella xylostella; population dynamics; temperature, rainfall; planting pattern; northeastern Yunnan
Abstract:[Objectives]  To understand the population dynamics of Plutella xylostella (L.) in the vegetable growing areas of northeastern Yunnan. [Methods]  The relationships between population size and temperature, rainfall and planting pattern, were quantified and analyzed. Sex pheromone trapping and field surveys were used to monitor the population dynamics of adults and larvae, respectively. [Results]  P. xylostella occurred year-round in northeastern Yunnan. The adult population has two major peaks in the spring and summer, from March to July, and minor peaks in autumn, from September to November. The maximum number of adults trapped was 971 per month per card in the spring-summer season, significantly higher than the number caught during the autumn peak of abundance. Larvae have a single peak of abundance in spring and summer, from April to July, during which the highest abundance was 1.75 larvae per plant. The average monthly temperature in northeastern Yunnan was -2.4-21.8 ℃, and annual rainfall was 317-872 mm. The abundance of the adult population was significantly correlated with temperature (r=0.315**), which was weakly correlated with rainfall (r=0.168). Larval population abundance was also closely correlated with temperature and rainfall (r=0.270 and r=0.296). The population dynamics of both adults and larvae were also consistent with the cultivation patterns and growth periods of cruciferous vegetables. [Conclusion]  Temperature and spring–summer planting patterns of vegetables are the main factors affecting the population structure and abundance of P. xylostella in northeastern Yunnan.
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