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Impact of the host cadaver on survival and infectivity of entomopathogenic nematodes (Rhabditida: Steinernematidae and Heterorhabditidae) under desiccating conditions.
Journal of Invertebrate Pathology 2003 Februrary
Entomopathogenic nematode species of Steinernema carpocapsae, Steinernema riobrave, or Heterorhabditis bacteriophora were used to compare survival and infectivity among infective juveniles (IJs) emerging in water from hosts in White traps (treatment a), emerging in sand from hosts placed in sand (treatment c), and emerging from hosts placed on a mesh suspended over sand (treatment m). Nematode survival and infectivity was recorded in sand at three-day intervals during 21 days of storage in desiccators at 75% relative humidity and 25 degrees C. Infectivity was measured by exposing 5 Galleria mellonella for 16 h to IJs. Treatment did not affect percent survival of H. bacteriophora IJs. Percent survival of S. riobrave and S. carpocapsae IJs was lowest in treatment a. Across all treatments, by 10 days after the beginning of the experiments, IJ survival declined to 93, 43, and 28% of levels on day 1 for H. bacteriophora, S. riobrave, and S. carpocapsae, respectively. For the three treatments, infection rate over time was described by a negative exponential function for S. riobrave and S. carpocapsae and by a sigmoid function for H. bacteriophora.
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