Re: nematodes

Severe nematode infections on terrestrial plants can be seen as roots 
that end in swollen, almost club shaped tips.  I have seen these symptoms 
only on plants (tomatoes) that were puprosely infected in the lab, but have  
not obsevered them elsewhere and not in my  aquariums.  I agree with Paul 
Krombholtz that it is unlikely that terrestrial parasites (specialized 
for particular host species) could be a problem in aquatic plants, but i 
suppose it can't be ruled out, especially if the soil is removed from a 
wet area.

paul bucciaglia