none MEAD-BRIGGS (1992) proposed a laboratory method to evaluate the side effects of pesticides on Aphidius rhopalosiphi De Stefani-Perez (Hymenoptera, Aphidiidae), a parasitoied of cereals aphids. The influence of relative humidity (60% and 85%), photoperiod (16h light and obscurity), storage temperature of mummies (2 degree C and 20 degree C) and the sensitivity of females and males was studied in this research. It appears from our results that the most important factors is relative humidity. Storage temperature of mummies is also important. Photoperiod during the assays and sex of parasitoids seem to have no influence on the sensitivity to phosalon. Reproduction; Sex differences; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Abiotic factors; Chemical factors Aphidius rhopalosiphi (Aphidiidae); Physiological and biochemical sex differences; Hemipteran hosts; Aphidoidea; Sensitivity to insecticide used against hosts; Mortality; Sensitivity to insecticide used against hemiptera hosts; Fertilizers and pesticides; Phosalon, non target sensitivity, abiotic & biotic factor relationships; Physical factors; Sensitivity to insecticide used against hemipteran hosts relationship Aphidoidea; Hymenopteran parasites; Aphidius rhopalosiphi; Parasite sensitivity to insecticide, effects of abiotic & biotic factors