Agnihotri, MeenaVerma, Neha2019-08-162019-08-162019-07http://krishikosh.egranth.ac.in/handle/1/5810121968Studies on bioefficacy of bamboo and some other plant oils against gram pod borer, Helicoverpa armigera (Hübner) and pulse beetle, Callosobruchus chinensis (L.) were carried out at NEB Crop Research Centre and in the Department of Entomology at G.B. Pant University of Agriculture and Technology, Pantnagar during rabi season, 2018-19. Under laboratory conditions, different plant oils viz., Dendrocalamus strictus bio oil, Bambusa bambus bio oil, Azadirachta indica oil, Mentha arvensis oil, Moringa oliefera oil, Rosemarinus officinalis oil, Jatropha curcas oil and Piper longum oil were evaluated for contact and fumigant activity against Callosobruchus chinensis. Dendrocalamus strictus bio oil (100.00%) and Mentha arvensis oil (100.00%) showed highest fumigant mortality whereas, Azadirachta indica oil (100.00%), Mentha arvensis oil (100.00%) and Rosemarinus officinalis oil (100.00%) showed highest contact mortality against C. chinensis after 72 hrs. Under field conditions, different plant oils were evaluated against H. armigera and results revealed that Azadirachta indica oil @ 3ml/l and Mentha arvensis + Rosemarinus officinalis oil @ 1.5 + 1.5 ml/l were found to be the most effective treatments in reducing egg population whereas, in reduction of larval population Bambusa bambus bio oil @ 3ml/l and Bambusa bambus bio oil + Azadirachta indica oil @ 1.5 + 1.5 ml/l were found more effective. The data on percent pod damage and grain yield supports the above result. Under unprotected and protected experiments (Dendrocalamus strictus bio oil spray), results indicated that protected PG3 variety intercropped with coriander was found to be the most effective treatment in reducing egg and larval population as compared to unprotected varieties whereas, unprotected PG3 variety intercropped with coriander was found to be the most effective treatment in maximizing natural enemy population as compared to protected varieties. Minimum percent pod damage and grain yield (6.0% and 2100.6 kg/ha) was recorded in protected PG3 variety as compared to unprotected PG3 variety (8.2% and 1290.6 kg/ha) while maximum (20.8% and 905.6 kg/ha) in unprotected PKC2 variety as compared to protected PKC2 variety (20.5% and 955.0 kg/ha ) when intercropped with coriander. Hence, Rosemarinus officinalis oil showed highest contact and fumigant mortality against C. chinensis under storage condition, while Dendrocalamus strictus bio oil and Azadirachta indica oil were more effective in reducing egg and larval population of H. armigera under field condition.ennullThesis