European earwig (Forficula auricularia) as a novel host for the entomopathogenic nematode Steinernema carpocapsae |
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Authors: | Hodson A K Friedman M L Wu L N Lewis E E |
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Institution: | a Department of Land, Air and Water Resources, University of California Davis, United States b Department of Forestry and Conservation, University of Montana, Misoula, United States c Department of Nematology, University of California Davis, United States |
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Abstract: | The natural history of many entomopathogenic nematode species remains unknown, despite their wide commercial availability as biological control agents. The ambushing entomopathogenic nematode, Steinernema carpocapsae, and the introduced European earwig, Forficula auricularia, forage on the soil surface. Since they likely encounter one another in nature, we hypothesized that earwigs are susceptible to nematode infection. In the laboratory, the LC50 for F. auricularia was 226 S. carpocapsae/earwig and the reproductive potential was 123.5 infective juvenile nematodes/mg tissue. This susceptibility depended on host body size with significantly higher mortality rates seen in larger earwigs. In a study of host recognition behavior, S. carpocapsae infective juveniles responded to earwig cuticle as strongly as they did to Galleria mellonella cuticle. We also found that earwigs exposed to S. carpocapsae cleaned and scratched their front, middle and back legs significantly more than controls. Coupled with previous field data, these findings lead us to suggest that F. auricularia may be a potential host for S. carpocapsae. |
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Keywords: | Entomopathogenic nematode Biological control Non-target effects Body size Host recognition Grooming |
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