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| Author(s): | Gerritsen L.J.M., Wiegers G.L., Smits P.H. |
| Year: | 1998 |
| Title: | Pathogenicity of new combinations of Heterorhabditis spp. and Photorhabdus luminescens against Galleria mellonella and Tipula oleracea |
| Citation: | Biological Control. 13:(1) 9-15. . |
Abstract:
Photorhabdus luminescens isolates were exchanged between four entomopathogenic nematode strains; two isolates of Heterorhabditis megidis from The Netherlands and two isolates of H. bacteriophora, one from Australia and one from Moldavia. When cultured on H. megidis symbionts only few H. bacteriophora infective juveniles retained the symbiotic bacterium. These infective juveniles, without symbiotic bacteria, were not pathogenic to insects. When P. luminescens was injected into insect larvae it could kill Galleria mellonella (Lepidoptera: Galleridae) larvae but it was not pathogenic to Tipula oleracea (Diptera: Tipulidae). The combination of nematode and bacterium killed T. oleracea, showing that the nematode is more than just a vector for the bacterium. Small differences in pathogenicity between the combinations could only be observed in T. oleracea, not in the highly susceptible G. mellonella. The pathogenicity of a combination depends on the pathogenicity of the bacterium, the pathogenicity of the nematode and the interaction between them. The pathogenicity of H. bacteriophora strains against T. oleracea was low, partly because of the low penetration rate of these strains |
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