Life-history traits of the acarophagous lady beetle,<Emphasis Type="Italic">Stethorus japonicus</Emphasis> at three constant temperatures |
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Authors: | Katsuhiko?Mori Mitsuyoshi?Nozawa Kazuya?Arai Email author" target="_blank">Tetsuo?GotohEmail author |
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Institution: | (1) Research Institute of Japan Plant Protection Association, Ushiku,Ibaraki 300-1212, Japan;(2) Laboratory of Applied Entomology and Zoology, Faculty of Agriculture, Ibaraki University, Ami,Ibaraki 300-0393, Japan;(3) Present address: Kohchi Experiment Station of Japan Plant Protection Association, Noichi, Kohchi 781-5231, Japan;(4) Present address: Institute of Sericulture, Dainippon Silk Foundation, Iikura 1053, Ami,Ibaraki 300-0324, Japan |
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Abstract: | Stethorus japonicusKamiya (Coleoptera: Coccinellidae) is an indigenous ladybird beetle in Japan, which feeds on many spider mite species. We evaluated the development, survivorship and life-history parameters of this lady beetle on a diet of eggs of the two-spotted spider mite, Tetranychus urticae Koch (red form) (Acari: Tetranychidae). In addition, the effect of short photoperiod on its reproduction was assessed. Survival rates from egg to adult were more than 71% at temperatures between 17.5 and 30 °C. The highest immature mortality was 100% at 35 °C followed by 76% at 15 °C and 52% at 32.5 °C. The lower threshold temperature for development from egg to egg-laying adult was 13.0 °C and the thermal constant was calculated as 238.7° days. Based on these data, the maximum number of generations that could complete development in a year under field conditions in Ibaraki, central Japan, would be between five and seven. The intrinsic rates of natural increase (rm) were 0.093 at 20 °C, 0.156 at 25 °C and 0.241 at 30 °C. Reproductive diapause was induced at photoperiods with light phases shorter than 13 h at 18 °C. |
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Keywords: | Acari Coccinellidae Coleoptera diapause intrinsic rate of natural increase ladybird beetle lower threshold temperature predator spider mite Stethorus japonicus Tetranychidae Tetranychus urticae |
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