Trichogrwrirna evanescens Westwood and Trichogrammatoidea bactrae Nagaraja were stored at low temperature (8^,C) as immature stages in parasitized P. gos$3^,pielle eggs or as adults. Development of im­mature stages and emergence of adults were differed significantly ac­cording to species, age of stored parasitoids and storage period. Moreo­ver, the adverse effect of low temperature extended to the next generation, as females activity of the following generation was found, significantly, lower compared to the control generation. The higher per­centage of emergence, the higher percentage of females with successful parasitization and the higher numbers of eggs/parasitoid female were produced in case of storing the prepupal stage. On the contrary, old pu­pae (7-clays after parasitism) of the two species were the most suscep­tible stage to the adverse effect of low temperature as the overall per­centages of emergence averaged 47.7 and 47.8 %, respectively. Moreover, storage of the parasitized eggs 7 days old after stinging for 30 days, the produced females were completey unable to parasitize any of P. gossypielia eggs. The sex-ratio in progeny was always in favour of female whatever the species or the stored age. Lower percentages of fe­males in progeny of the two species were generally recorded by increas­ing the storage period to 25 days. Storage of adult females of the two parasitoids showed a degree of tolerance to the adverse effect of low temperature up to 3 days, however, all females that stored for 0 days tailed to parasitize any egg. Furthermore, high percentages of progeny emerged form P. gcssypiella eggs parasitized by T. evanesc6as and T. bactrae females that were stored at low temperature (PC) up to 4 days, but all progeny failed to develop in P. gossypiella eggs as the storage period was prolonged to 5 days.