Source area of spring population of meadow moth, Loxostege sticticalis L. (Lepidoptera: Pyralidae), in Northeast China |
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Authors: | Chen Xiao Zhai Baoping Gong Ruijie Yin Minghao Zhang You and Zhao Kuijun |
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Institution: | 1. Key Laboratory of Monitoring and Management of Plant Diseases and Insects, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China;2. Plant Protection Station of Chifeng, Chifeng 024001, China;3. Plant Protection Station of Xinganmeng, Wulanhaote 137400, China;4. Plant Protection Station of Hulunbeier, Hailaer 021000, China;5. College of Agriculture, Northeast Agricultural University, Harbin 150030, China |
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Abstract: | The meadow moth, Loxostege sticticalis L., is an important outbreak pest in Northeast China. The spring population in Northeast China was considered as immigrants from North China; however, the population dynamics during 1996–2007 was not consistent with this traditional theory. In this study, the source area of the spring population of the meadow moth in Northeast China was identified by trajectory analysis using the wind field simulated by mesoscale numerical forecast model MM5. The results indicated that the population of the meadow moth in North China was able to migrate into Northeast China, but had not made a crucial contribution to the outbreaks there since the weather systems were generally adverse for such a long range migration in most of the years. On the other hand, high density cocoons of L. sticticalis have frequently been found in autumn in Northeast China since 1996. The trajectory analyses indicated that most of L. sticticalis in Northeast China in spring emerged from the cocoons that had overwintered either locally or in neighboring countries, i.e. Mongolia and Russia. The development of overwintering areas at higher latitudes coincides with the increased frequency of second-generation larvae; both phenomena might be attributed to the regional climate change associated with global warming. |
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Keywords: | Loxostege sticticalis migration outbreak population trajectory analysis |
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