Abstract: An ecological study on the laboratory population of psocid, Liposcelis bostrychophila B.,was carried out on a diet composed of whole wheat flour,yeast and skimmed milk powder (10∶1∶1) at 8 levels of temperatures ranging from 17.5℃ to 35℃,as well as 5 humidities ranging from 50 to 90%RH. The parameters for development,survival and fecundity of the psocid laboratory population were obtained by means of statistics analysis in various rearing experiments.The results showed that the temperature lower than 20℃ and relative humidity less than 60%RH had adverse influence on survival.Within the range of 20～35℃,the mean development period of a generation was 59.8～19.1 days,the theoretical developmental threshold and the total effective temperature were 13.45℃ and 414.05 day-degree.The average numbers of eggs laid per female was 51.9～74.7. The highest generation survival rate was recorded at 27.5℃,while the lowest at 20℃.Within the range of 60%～90%RH, the shortest developmental duration at different stages was at 90%RH, while the highest survival rate and fecundity were observed at 80%RH. Consequently,the optimum temperature and relative humidity for its growth and reproduction were 27.5～30℃ and 80%RH.Finally,theoretical models for developmental speed,survinval rate and fecundity were suggested.

Key words: Liposcelis bostrychophila Badonnel, developmental duration, total effective temperature, fecundity, survival rate, theoretical models