8. 



occurs on clay soils. It is foxind on a wider range of soil types 



than P. penetrans, 



P. minyus and P. thomei occur on clay soils. The first species 

 is found occasionalTy xn dune sand. 



From the present information it is impossible to give one set of 

 soil ciiaracteristics defining a favorable soil for each of these nema- 

 tode species. Some of tne soils where P. penetrans is found in England 

 and Au3oi'alia contain much more Ixne rainerai material than in thosp 

 soils where the nematode occurs in the Netherlands. However, P. pene - 

 trans has never been reported as a serious pest on clay soils. 



