The present investigations were undertaken, during the year 2014 and 2015 in the bio-control laboratory, Department of Entomology, CSA University of Agriculture and Technology, Kanpur. Studies conducted to investigate the impact of differently coloured cards, used for fixing the host Corcyra eggs, on the biological attributes of Trichogramma chilonis
indicated that under multiple choice conditions, the per cent parasitism differed significantly on egg cards of different colours. The per cent parasitisation was recorded on five coloured cards viz. yellow, mint green, pink, blue and white. The observations were recorded after 4th, 6th and 8th days on 100 eggs of Corcyra, glued on coloured cards. To observe effect of different coloured tricho-cards on egg laying responses of females, Trichogramma chilonis
showed maximum parasitism on yellow coloured cards to the tune of 86.00 and 85.50 per cent after 8th day during 2014 and 2015, respectively. Minimum parasitization was recorded on white coloured card with 75.25 and 77.40 per cent parasitization is both the years, respectively. However, maximum emergence on pink coloured egg card to the extent of 87.57 and 86.85 per cent was noticed in the year 2014 and 2015, respectively. Minimum emergence per cent was observed on white coloured egg cards to the extent of 76.35 and 77.40 adults on 12th days in both the years, respectively.