DEEPIKA KALKAL, KRISHNA ROLANIA, SWATI MEHRA, S S YADAV AND ARUN JANU

The experiment on impact of different management schedules on parasitization of whitefly by its parasitoid was carried out on cotton crop during khanf 2014 at the Cotton Research Farm, Department of Genetics and Plant Breeding, CCS Haryana Agricultural University, Hisar. Effects of seven insecticides were tested under field conditions on parasitization of whitefly. Parasitization ranged from 51.83 to 88.43 per cent during August to September. Mean pupal parasitization was maximum (74.79 %) in a management schedule consisting of six sprays of nimbecidine (azadirachtin 0.03% @ 1 L/ac) at five days interval and a yellow sticky trap placed in the plot followed by 70.82 % in a schedule of six sprays of nimbecidine at five days intervals only. The minimum parasitization (56.47%) was recorded in a schedule consisting of six sprays at five days interval each of dimethoate followed by imidacloprid, thiamethoxam, dimethoate, imidacloprid and thiamethoxam. It was concluded that different management schedules had significant effect on parasitization of whitefly pupae by Encarsia spp. and nimbecidine was found relatively less toxic and much safer to the natural enemies than other insecticidal treatments.