朱砂叶螨室内种群特性

CHARACTERISTICS OF LABORATORY POPULATION OF TETRANYCHUS CINNABARINUS(BOISDUVAL)

以木薯、木瓜的叶片为饲料，在室温（２５－２８℃）条件下通过对朱砂叶螨的饲养和生命活动观察而组建了其室内种群生命表，并计算其内禀增长率及其它种群特征参数。在木薯和木瓜上，朱砂叶螨的内禀增长率（ｒｍ）分别为０．２５７６和０．２９８５，周限增长率（λ）分别为１．２９３８和１．３４７９，净增殖率分别为２６．３８７０和２４．０２０８，世代平均历期（Ｔ）分别为１３．２９２０天和１１．１７３９天，种群加倍时间（ｔ）分别为２．６９０８天和２．３２２１天；在稳定年龄组配中，未成熟期所占比例分别为９０．９２７１％和９１．８５１４％，成熟期所占比例分别为９．０７３５％和８．１５４６％。从生命表中可看出，木薯和木瓜是朱砂叶螨的适宜寄主，在两寄主上，朱砂叶螨具有较大的种群发展潜力。

A life table was constructed based on the life of Tetranychus cinnaba-rinus (Boisduval)bred on cassava and papaya leaves at the room temperat-ure of 25-28℃,and the intrinsic rates of increase and other parameterswere calculated,The intrinsic rate of increase,the limit of increase rate,the net reproduction rate,the mean generation period,the time for doubl-ing population were 0.2576,1.2938,26.387,13.292 (days),2.6908 (days)respectively on cassava and 0.2985,1.3479,24.0208, 11,1739 (days),2.3221(days) on papaya,In a stable population age composition,the immatureand mature age made up 90.9271%and 9.0735%on cassava and 91.8514%and 8.1546%on papaya.The results show that cassava andpapaya are twosuitable host plants for T.cinnabarinus (Boisduval).On these hosts,T.cinnabarinus (Boisduval) has a great potential for population growth.