Effect of Nitrogen Controlled Atmosphere Stress on Fitness of Experimental Populations of Cryptolestes ferrugineus
In order to understand the influence of different nitrogen concentrations on the population fitness of Cryptolestes ferrugineus(Stephens),the growth and development of the experimental population of C.ferrugineus(Stephens)after 24 hours of stress with 95％and 98％nitrogen concentrations were studied by constructing a life ta-ble,and the effects of different nitrogen concentrations on the life parameters and population fitness were analyzed.The results indicated that,compared with the control group,under the treatment of 95％nitrogen concentration,the hatching rate,pupation rate and emergence rate of C.ferrugineus revealed a downward trend with the increase of ni-trogen concentration,decreased by 2.00％,11.34％and 8.80％,respectively.The developmental duration of eggs,larvae,pupae and total development was prolonged with the increase of nitrogen concentration,by 0.2,2.0,0.4 d and 2.6 d,respectively.Under the treatment of 98％nitrogen concentration,the hatching rate,pupation rate and emergence rate of C.ferrugineus revealed a downward trend with the increase of nitrogen concentration,de-creased by 6.00％,25.33％and 13.51％,respectively.The developmental duration of eggs,larvae,pupae and to-tal development was prolonged with the increase of nitrogen concentration,by 0.4,4.3,1.0 d and 5.8d,respective-ly.Besides,the controlled atmosphere stress of nitrogen resulted in a significant decrease in the number of eggs laid by the single female of the current generation of C.ferrugineus,and an increase in the proportion of female offspring,but the number of eggs laid by the single female of the offspring was not affected.
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