The effects of Sub lethal doses of Deltamethrin and Trichlorofen on functional response of the parpasitoid wasp Habrobracon hebetor(Hym: Braconidae) fed on plodia interpunctella in laboratory condition

One of the most important biological control agents is Habrobracon hebetor especially for Indian meal moth. Functional response studies are important for successful application of natural enemies in pest control programs. In this research, has been studied the effect of sub lethal doses of Deltametrin and Trichlorfen on functional responses of H. hebetor at controlled condition (26±1 Celsius, 65±10% humidity, 16:8 L: D). larvae, pupae and adults of Indian meal moths have been used separately in densities of 2, 4, 8, 16, 32, 64 and 128. Dipping method was used for larvae, pupae and contact method for adults in exposed cages. Functional responses and its parameters determined respectively by logistic regression and non-linear regression by SAS software. Results showed H. hebetor on larvae and pupae had functional response type 3 but on adults type 2 that has been affected by both insecticides. Searching efficiency was affected by Deltametrin in control, larvae, pupae and adults were determined respectively, 0.008, 0.007, 0.009 and 0.037 /h and handling time 0.99, 1.8, 1.26 and 1.66 h. Searching efficiency was affected by Trichorfen in control, larvae, pupae and adults were recorded respectively, 0.008, 0.007, 0..6 and 0.052 /h and handling time 0.99, 1.25, 1.12 and 2.11 h. these results showed that sublethal doses of both insecticides have been affected only on adult moths functional responses parameters of H. hebetorand showed significant difference