none Chromatomyia syngenesiae; HYMENOPTERAN-PARASITES; Dacnusa sibirica; Parasite emergence, effects of humidity, laboratory study Dacnusa sibirica; EMERGENCE-; Humidity relationships; DIPTERAN-HOSTS; Chromatomyia syngenesiae; Humidity effects on parasite emergence; HUMIDITY-; Emergence relationships, dipteran host, laboratory study The effects of four humidities (33, 55, 76 and 93% relative humidity) and four ages (0-1, 2-3, 4-5, 6-7 days) of parasitized Chromatomyla syngenesiae puparia on adult emergence in the leafminer parasitoid Dacnusa sibirica were examined in the laboratory. Parasitized puparia harvested at 0-1 days were susceptible to low humidities resulting in a significantly reduced parasitoid emergence. Aging of the puparia appeared to protect the developing parasitoid from low humidities. Increasing humidity produced a corresponding increase in the longevity of the adult parasitoid.