Behavioural orientation of pod borer, Helicoverpa armigera (Noctuidae: Lepidoptera), to alternate weed host plant induced infochemicals

Abstract

Prior results have provided insights plants and plant induced herbiovore produce a diverse array of secondary metabolites /volatile organic compounds act as a chemical barriers/attractant for herbivores. In present study had been carried out in order investigate the response of alternate weed host plant  mediated cues to Helicoverpa armigera  and the maximum orientated treatment were subjected to GC-MS analysis for chemical constitute studies. The experiment result confounded that, amid the different treatments used, the highest orientation behavior towards Bathuwa Chenopodium album with 29.16 per cent followed by ciberium with 22.22 per cent orientation behavior and the least preferred weed host on par for sorghum halepence with (20.77) and parthenium leaves with 20.83  percent orientation. In GC-MS the active compounds with their retention time (RT), molecular formula, molecular weight (MW) and concentration (peak area %) considered and the compounds present in the Bathuwa were Hexacosane  with percentage (14.63 %, 6.99%, 2.63 % and 1.4 %) at different peak level followed by Tetracontane (3.34%) and least active compound for attraction was Germacrene B (0.1%).The present result would gives for future in depth studies on weeds for developing either for specific pheromone compound or repellant compound for the eco- friendly management of H. armigera.

Keywords: Herbivore induced volatile, infochemicals, semiochemical, Chenopodium album, Helicoverpa armigera, sorghum halepence