Abstract
Entomopathogenic nematodes are proven alternatives to pesticides in crop protection as they belong to the Heterorhabditidae and Steinernematidae families. The role of entomopathogenic nematodes has expanded considerably in the recent past for their efficacy as biopesticide which is influenced by nematode species and strain. Members of the genus Heterorhabditis have been found to harbor a symbiotic bacteria Photorhabdus sp. When the nematode is ingested by the insect, Photorhabdus sp. is released into the host haemocoel where they multiply rapidly and kill the insect. The main objective of our research was to examine the insect killing toxin property of symbiotic bacteria isolated from the entomopathogenic nematodes Heterorhabditis indica. The antagonistic potential of insecticidal toxin from Photorhabdus sp. was investigated. The results prove that toxic components produced by these bacteria could kill pests either through ingestion or injection. The broad-spectrum antimicrobial property produced by Photorhabdus sp. was analysed by conducting both antibiogram and antibiosis studies.
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