The present invention relates to a method for inducing an infection of an insect pathogenic nematode using carbon dioxide or ammonia. More specifically, an infection with a protective oil film against Steinernema carpocapsae or Heterorhabditis bacteriophora , which are insect pathogenic nematodes by injecting carbon dioxide or ammonia gas into a culture vessel for culturing insect pathogenic nematodes. It is about how to induce the womb. The present invention can further increase the insecticidal power against pests by increasing the culture yield and the rate of infection through the gas treatment of carbon dioxide or ammonia as described above. In addition, insect pathogenic nematodes induced by infectious conditions can be produced as products as long-term storage at low temperatures is possible by forming a protective oil film. It can be used in eco-friendly cultivation areas, and it is effective in reducing pest control costs and control power of farms with its high insecticidal effect, and it is expected to increase farm household income by increasing the quantity and marketability of cultivated crops.
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