none Aphidius colemani; HEMIPTERAN-HOSTS; Aphis gossypii; Host life table relationships Aphis gossypii; REPRODUCTION-; Life table study, effects of temperature, plant host & parasitism; LIFE-CYCLE; Life history, plant host, temperature & hymenopteran parasite relations; HYMENOPTERAN-PARASITES; Aphidius colemani; Plant hosts; LIFE-TABLES; Plant host cultivar, distribution on host, temperature & parasite relations; TEMPERATURE-; Life table relationships, glasshouse plant hosts Life table data for Aphis gossypii Glover (Homoptera: Aphididae), an important pest in glasshouse cucumber crops, were studied at 20, 25 and 30 degree C on two cucumber cultivars (Cucumis sativus L.) in controlled climate cabinets. The development time on the cucumber cv. 'Sporu' ranged from 4.8 days at 20 degree C to 3.2 days at 30 degree C. Immature mortality was approximately 20% and did not differ between temperatures. Most mortality occurred during the first instar. Reproduction periods did not differ among temperatures, but at 25 and 30 degree C more nymphs were produced (65.9 and 69.8 nymphs/ female , respectively) than at 20 degree C (59,9 nymphs/ female ) because of a higher daily reproduction. Intrinsic rate of increase was greatest at 25 degree C (r-m = 0.556 day-1). At 20 and 30 degree C the intrinsic rate of increase was 0.426 and 0.510, respectively. On cv. 'Aramon', the development time of A. gossypii was approximately 20% longer at all temperatures. Immature mortality did not differ between the two cultivars. The intrinsic rate of increase on cv. 'Aramon' was 15% smaller than on cv. 'Sporu'. The use of cucumber cultivars partially resistant to aphids is discussed in relation to biological control of cotton aphid in glasshouses. Development time and immature mortality on leaves of the middle and upper leaf layer of glasshouse grown cucumber plants (cv. 'Aramon') were comparable to development in the controlled climate cabinets. On the lower leaves immature mortality was much higher (approximately 82%) than on leaves of the middle (24.0%) and upper leaf layer (24.5%). Reproduction was less on the lower leaf layer (45.9, 70.5 and 70.1 nymphs/ female on leaves of the lower, middle and upper leaf layer, respectively). Aphids, successfully parasitized by Aphidius colemani Viereck (Hymenoptera: Braconidae) only reproduced when they were parasitized after the third instar. Fecundity was 0.1 to 0.9 and 10.5 to 13.3 nymphs/ female for aphids parasitized in the fourth instar or as adults, respectively. Reproduction of aphids that were stung but survived the attack was lower than for aphids not stung. Average longevity of these aphids was equal to the longevity of aphids not stung by A. colemani.