KULKARNI, K.A.KEDANURI, CHANDRASHEKHAR2019-10-222019-10-222001-08-06Th-5940http://krishikosh.egranth.ac.in/handle/1/5810132464Experiments were conducted to find out the parasilizatlon by five Trichogranma spp on chilli fruit borer Helicoverpa armigera (Hubner) in laboratory and greenhouse conditions. Along with some basic studios on the effect of food on fecundity of the parasitoids, lifecycle, host aee preferrence were also carried out in addition to tritrophic interaction among chilli genotypes, T. chilonis and H. armigera and relative toxicilv of recommended insecticides to chilli fruit borer against egg parasitoid." Fecundity of the parasitoids developed on II. armigera eggs was found significantly different among different parasitoids, T. chilonis recorded high fecundity with food (10% honey) and without food. While T. japonicum and T. achaeae recorded low fecundity/female with and without food respectively. Life cycle of the parasitoid was longest in T. achaeae (217.6 h) while T. chilonis took least period (1912h) on H armigera. Fresh to two days old eggs of H. armigera were equally acceptable by all the five parasitoids while three to four days old eggs were less to least preferred. Maximum per cent parasitization of chilli fruit borer under laboratory and greenhouse conditions was accounted by T chilonis (61 & 39.93%) followed by T. pretiosum (51.52 & 31.08) and T.brasiliensis (44.25 & 28.50%) respectively. Byadgi Kaddi and Byadgi dabbi were found biocontrol friendly which recorded high parasitization while LCA- 312 and GPC-82 were found least acceptable to parasitoid T chiloiiis on H. armigera eggs. The insecticides dimethoate, phosphamidon, pliosalone and carbaiyl were highly toxic to T. chilonis adults on 24 h after treatment where as dicofol, monocrotophos and endosulfan were slightly less toxic while neemark was safe to adults. Neemark was found to be safe while endosulfan and dicofol were relatively less toxic to immature stages of T. chilonis while carbaiyl was the most toxic. Emergence of T. chilonis adults was signincanlly reduced when insecticides were sprayed on host eggs before parasitization. Longevity of T. chilonis adults that emerged from insecticide treated host eggs were found to be adversely affected.ennullThesis