禾谷缢管蚜和麦长管蚜实验种群参数的差异

Difference Between Parameters of the Experimental Populations of Rhopalosiphwn padi(Linnaeus)and Macrosiphum avenae(Fabricius)

在室内自然变温（平均２０．２１℃）条件下，组建禾谷缢管蚜和麦长管蚜实验种群生命表。结果表明，禾谷缢管蚜的发育速率快，若蚜存活率高，有翅蚜比率明显偏低；禾谷缢管蚜和麦长管蚜的种群趋势指数（１）分别为５４．４０和３３．７０，净增殖率（Ｒｏ）、内禀增长力（ｒ＿ｍ）及周限增长率（λ）分别为５４．１５和３４．０、０．２４８６和０．１６８８及１．２８２２和１．１８３９．尽管这两种麦蚜成蚜期远长于若蚜期，但由于内禀增长力均相当大，使得稳定年龄分布中若蚜的比率分别高达９０．３５％和８９．３１％。

Under natural temperature conditions in the laboratory,the life tables of the ex-perimental popuiations of cereal aphids Rhopalosiphum padi(Linnaeus)and Macrosiphum avenae(Fabri-cius)were constructed. The results showed that the development rate of R.padi was faster than thatof M.avenae,the survival percentage of the nymphs was higher,the alatus aphids percentage was obviously lower. The indexes of population trend of R.padi and M.avenae were 54.40 and 33.70 re-spectively;net reproductive rates, innate increase capacities and finite increase rates were 54.15 and34.0.0.2486 and 0.1688、and 1.2822and1.1839.respectively. Though the adult stages weremuch longer than the nymphal stages of the two aphids,the rather high increase capacities caused thehigher proportions of the nymphs. 90.35%and 89.31%.respectively,in the stable age distribution.