| O. sauteri was an efficient polyphagous predator in greenhouse. But it was not still biocontrol agent available in market because of the unsuccessful artificial diets and rearing methods. According to the predatory property of O. sauteri, two artificial diets were selected and the efficiency of frozen powder of male pupae of Apis mellifera Lwas assessed by the life table' method. The effects of temperature, day-length and relevant humility on the development and reproduction were measured. The adult pretreatment contributed to cold storage. The study of numerical response and preference of O. sauteri to prey provided theoridical base for field releasing of O. sauteri. The main results were as follow:1 . Development, reproductive, and adult longevity of O. sauteri were studied for 3 generations in the laboratory using the frozen powder of male pupae of A. mellifera and Trichogramma ostriniae pupae in Anther aea pernyi eggs as prey. The mortality and per female fecundity of O. sauteri reared T. ostriniae pupae was 23.9%, and differed significantly between each generation. Per female fecundity decreased sharply with the generation. The mean mortality of O. sauteri fed on frozen powder was 19.3%; the developmental time of each generation was similar. There was no significant decrease scope among each generation although female fecundity decreased with the rearing time.2. The efficiency of frozen powder on O. sauteri was evaluated through the life table method and the major factors influencing the rearing efficiency were analyzed. The results showed the nutrition and form of the artificial diet causing high mortality were the main reasons. O. sauteri fed on frozen powder suffered short developmental time, smaller size of adult body, a little lower sex ration( female/ male) and less fecundity. The frozen powder absorbing humidity easily became muddy and led nymph to be drowned. In the whole, however, the mortality didn't differ significantly with the control; the emergency rate was high. The size of adult body individual was a little smaller, but the predatory ability remained strong and active. When O. sauteri reared artificial diets during nymph and aphids during adult, the reproduction of O. sauteri increased significantly.3. The development and reproduction of O. sauteri were studied at 3 constant temperature, 3 day-lengths and 3 relevant humidity (RH). The temperature significantly affected development of both egg and nymph. The duration of egg developmentdecreased significantly with each increase in temperature, which took 7.9 and 2.5 days at 20 "C and 30 C, respectively. Total nymph developmental time decreased significantly with the increase of the temperature.lt was 24.9 and 8.0 days at 20 C and 30 C, respectively. The nymph mortality ranged between 18.6%~20.6% at 20 C ~25 C, which was significantly lower than that at 30 C( 24.8%~28.7%). The RH had great effect on the egg survivorship and hatchability, both of which were lowest at RH55%. The short day-length affected female reproduction slightly only under low temperature. The female adult did not lay eggs both at 20 C and llh day-length. But when the temperature was above 25 C, all female adult laid eggs at all short day-length. In addition, the nymphal development period was shorter under short day-length than long day-length. But there was no significant difference between them.4.The effect of pretreatment (low temperature and short day-length) on O.sauteri adult longevities was determined. The longevity of female adult reared under 1 5 1 C,8L:16D before cold storage was longer than that under 18 + 1 C,10L:14D and 21 1 C,12L:12D. Moreover, through this pretreatment, the survivorship of female adult reared for 7days was significantly higher than that reared for l~5d. The time of 50% and 70% individuals' death was 43. 6d and 50. 5d respectively. The longevity of male adult reared for only Id was 8.7d, but it reduced by 4.3d when reared for 7d. The survivorship of 50% and 70% individuals' death was 7.3d and 10. 7d respectively. The short p...
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