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2012年49 No.6
Comparative life table parameters of the beet armyworm，Spodoptera exigua，on four host plants
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Key Words：Spodoptera exigua，host plant，life table parameter
Abstract： 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．