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实验观察了小菜蛾取食不同种白菜和油菜的主要生物学参数,包括幼虫、蛹的历期、蛹质量、化蛹率、羽化率和雌虫产卵量.结果表明:(1)取食苔菜(Brassica camelina) 幼虫历期最短,取食花椰菜(B. oleracea var. botrytis)幼虫历期最长;(2)取食不同蔬菜化蛹率变化明显,其中以白芥(Brassica alba) 最高达90.7%,羽化率变化很大,以欧州油菜(Brassica napus)最高达84%;(3) 蛹质量也因寄主不同而异,取食蔬菜B. napus 最低为5.68 mg,取食香花芥菜(E. sativus)最高为7.54 mg.(4)取食香花芥菜雌虫产卵量最高为165.50粒;(5) 蛹质量和寄主含氮量,产卵量和寄主含氮量,产卵量和蛹质量分别相关性显著,并建立了回归方程分别为:Y=4.092 7+0.650 5 N,Y=-118.574 0+57.562 5 N和 Y=-379.420+71.881X.“,”Different Brassica vegetable crops and oil seed Brassica crops were applied to observe the biological parameters of Plutella xylostella under laboratory condition. The larval, pupal duration, pupal mass, percent larval pupating, percent survival to adult and fecundity were recorded. The shortest larval and pupal period was recorded on Brassica camelina and Eurica sativus, and the longest larval and pupal period was recorded on cabbage Brassica oleracea var. capitata and Brassica oleracea var. botrytis. Percent larvae pupating varied significantly, and percent survival to adult stage was also varied significantly. The highest survival rate was found on cauliflower Brassica oleracea var. botrytis. Pupal mass on different host plants varied significantly, the lowest on Brassica napus and the highest was on E. sativus. The highest fecundity was observed on rocked seed fed female. Nitrogen content of different host plant leaves were also varied considerably and had obviously correlative with the pupal mass and the fecundity.