author(s)
C Mohan, S Sridharan, K Gunasekaran, KS Subramanian and N Natarajan

abstract
Experiments were carried out under laboratory condition to assess the toxicity of nano emulsion of hexanal on the parasitoids viz., Trichogramma chilonis Ishii and T. pretiosum Riley (Hymenoptera: Trichogrammatidae) which are widely used to check many lepidopteran pest. Four days old T. chilonis and T. pretiosum parasitized Corcyra egg were treated with nano emulsion of hexanal. The treated parasitized Corcyra eggs were observed for the emergence of Trichogramma adults. Based on the emergence hole of adult, the percent parasitization was worked out at 72 hours after treatment. Trichogramma adults emerged from hexanal treated cards were assessed for parasitization and subsequent adult emergence from the parasitisized egg (II generation) was also noted. The results clearly indicated the safety of nanoemulsion of hexanal to T. pretiosum and T. chilonis with 98.53 and 97.88 percent parasitization and 97.57 and 96.60 adult emergence respectively. In addition, the respective II generation T. pretiosum and T. chilonis adults also showed 96.12 and 97.65 percent parasitization with 94. 29 and 96.40 percent adult emergence.