Abstract

The microbotrophic nematode Rhabditis necromena (Rhabditidae) is a promising biological control agent against the introduced pest millipede, Ommatoiulus moreletii in South Australia. The actual host appears to be the native Australian millipede Akamptogonus novarae. Dauer juveniles of R. necromena remain inside the haemocoel of this host until it dies and resume their development after feeding on bacteria present in the decaying carcass ('necromeny'). In contrast, soil bacteria that are attached to the surface of the invading nematode juveniles, regularly cause a lethal contamination in the non-adapted O. moreletii.

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