甜菜夜蛾在四种寄主植物上的生命表参数比较研究
Comparative life table parameters of the beet armyworm，Spodoptera exigua，on four host plants
董钧锋 张友军 朱国仁 王少丽
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作者单位：1． 河南科技大学林学院洛阳471003;2． 中国农业科学院蔬菜花卉研究所北京100081)
中文关键词：甜菜夜蛾，寄主植物，生命表参数
英文关键词：Spodoptera exigua，host plant，life table parameter
中文摘要： 在控制条件下对甜菜夜蛾Spodoptera exigua (Hübner)在白菜、大葱、甘蓝和豇豆上的生命表参数进行了比较研究。结果表明，甜菜夜蛾幼虫在4 种寄主植物上均为5 个龄期。幼虫和蛹在大葱上的发育历期最长，在白菜上最短。甘蓝叶片饲养的甜菜夜蛾生殖力最高，单雌产卵量为1 015. 8 粒，豇豆叶片上饲养的生殖力最低，为496. 1 粒。甜菜夜蛾在甘蓝上的内禀增长率和净增殖率最高，分别为0. 237 和287. 82，在大葱上最低，分别为0. 172 和173. 90。在大葱上甜菜夜蛾幼虫存活率较低，在其他3 种寄主植物上较高。甜菜夜蛾的特定年龄生殖率在甘蓝叶片上最高，第22 天单雌产卵量高达453. 6 粒。研究结果表明，在选取的4 种植物中，甘蓝是甜菜夜蛾的最适寄主。
英文摘要： The effects of four host plants on life table parameters of beet armyworm，Spodoptera exigua (Hübner)，werestudied in the laboratory at( 27 ± 1 )℃，relative humidity of 65% ± 5% and photoperiod of 18L ∶ 6D． The host plantstested were Chinese cabbage (Brassica campestris L． ssp． pekinensis (Lour． ) Olsson)，Chinese onion ( Allium fistulosumL． var． giganteum Makino)，cabbage ( Brassica oleracea L．var．capitata L． )，and bean ( Vigna unguiculata W． ssp．sesquipedalis ( L． ) Verd) ． The results show that five larval stages of S． exigua occur on the four host plants tested． Thelarval and pupal eriodswerelongest on Chinese onion，and shortest on Chinese cabbage． Among the different hostplants，S． exiguaexhibited the highest fecundity on cabbage，with 1 015. 8 eggs / female and the lowest on bean，with496. 1 eggs / female． The intrinsic rate of increase ( rm ) ranged from 0. 172 to 0. 237，with the highest rate ncabbage andthe lowest on Chinese onion． The highest net reproductive rate ( R0 ) was on cabbage，with 287. 82 female / female /generation and the lowest was on Chinese onion with 173. 90 female female /generation． Larval survival was lower onChinese onion than on the other three host plants． Age-specific fecundity rate of S． exigua was higher on cabbage than theother plants． It is concluded that cabbage is themostsuitable host plant for S． exigua of the four plants tested in this study．