Abstract: One species of insect nematode (Caenorhabditis sp CNM)， which can cause Galleria mellonella death within 4 days， was discovered in the compost of Agaricus bisporus through the Galleria bait method In order to discover the biologicalcontrol potential of CNM in the field application， we investigated its biology characteristics， especially the infectivity and antistress resistance The result of its infectivity to G mellonella showed that the larger of the dosage， the better of its infectivity LD50 of CNM to G mellonella was 46.6 IJs per larva， and the LC50 is 53.8 IJs·cm-2 at 48 h After 45 min， 20 h and 55 h， all of the nematodes died with water bathing of 42℃， 40℃ and 38℃ Therere still 46.0% of the nematodes alive after 12 h under 25℃， 50.5 % RH， and the infectivity decrease was 43.3% Besides， there were re 57.1% of nematode that can move for as far as 3.6 cm under 30℃ So Caenorhabditis sp CNM strain has the biocontrol potential with good infectivity， heat resistance and desiccation.

Key words: Agaricus bisporus, Caenorhabditis, biocontrol, infectivity, antistress resistance