As well as the various fungi that trap and devour soil dwelling nematodes
there are also bacteria (eg Pasteuria) that attack (certainly plant parasitic
but not sure about other) nematodes. Some effort has been put into trying to
develop these bacteria as biological control agents for plant parasitic
nematodes (esp root knot nematodes). There are also a number of reports of
Wolbachia or Rickettsi (sp?) like bacteria found in filarial and plant
parasitic nematodes but whether these are symbionts or parasites is something
I'm not sure about.
Russell Farris wrote:
> I know there are viruses that prey on bacteria. Chlamydiae have been found
> in protozoans. Are there other examples of pathogens having pathogens. Are
> there, for example, bacteria that attack helminth worms? Thanks.
>> Russ Farris