Effects of different diets and temperatures were studied. Results showed that Ololaelaps nasri fed, developed and oviposited successfully on 5 different diets. The soil nematode Rhabditis scan­ica was the most suitable diet, resulting in shortening the life cy­cle duration of female and male (9.3 and 8.9 days. respectively). Mean female fecundity was 47.8 and 30.9 eggs when fed on R scanica and Musca domestics larvae, respectively. Presence of R scanica alone or mixed with other food was responsible for the high rates of reproduction. Temperature of 25°C was the best for popula­tion increase. Female consumption was higher than males. Female life cycle duration averaged 13.8, 9.3 and 5.4 days at 20, 25 and 30^°C, respectively. Fecundity and oviposition daily rate (47.8 eggs and 2.2 eggs / female / day) were the highest at 25^°C, while alternating temperature reduced fecundity and development as well. Female life cycle prolonged by 75% and 60% and fecundity reduced to 60 and 79%, when alternating temperature regimes 10/ 20 and 15/20^°C were used, respectively, compared with similar ob­tained values at 20^°C Exposing eggs to alternating temperature every twelve hours 10/20^°C increased gradually the incubation period and the mean time of hatchability decreased from 63.3 to 23.3% for the same ex­posure time. Absence of male resulted in production of only males with lowest fecundity (24.9 eggs / female) showing the importance of male presence once / five days or allover female longevity.