Effects of temperatures on the development and reproduction of the armyworm,Mythimna roseilinea: Analysis using an age-stage,two-sex life table |
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| Authors: | Jian-yang QIN Yue-qiu LIU Lei ZHANG Yun-xia CHENG Li-zhi LUO Xing-fu JIANG |
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| Institution: | 1. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R. China;2. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China;3. College of Landscape Architecture, Beijing University of Agriculture, Beijing 102206, P.R. China |
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| Abstract: | The armyworm Mythimna roseilinea (Walker) is a major pest of grain crops in South China. So far little is known about its basic biology and ecology, making prediction of population dynamics difficult. This study examined the relationships of individual development and population growth with temperature based on an age-stage, two-sex life table of M. roseilinea reared on maize in the laboratory at 18, 21, 24, 27 and 30°C. The highest values of net reproductive rate (R0) and fecundity were observed at 21 and 24°C, respectively. Both the intrinsic rate of increase (r) and finite rate of increase (λ) increased significantly and mean generation time (T) decreased significantly with increasing temperature. M. roseilinea was able to develop, survive and lay eggs at all temperature regimes tested. Development rates of the egg, larval, pupal, as well as the whole pre-oviposition stages had a positive linear relationship with temperature. The calculated development threshold temperatures of egg, larval, pupal, pre-oviposition and total pre-oviposition stages were 13.29, 8.39, 14.35, 7.42, and 12.24°C, respectively, and their effective accumulated temperatures were 63.59, 445.00, 211.11, 89.02, and 698.95 degree-days, respectively. These results provide insight into temperature-based phenology and population ecology of this insect pest and will allow population prediction and management available in the field. |
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| Keywords: | life table temperature lower threshold temperature effective accumulated temperature |
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