'Z* 



many vegetable crops and ornamental plants. 



b. D. destructor on irises and potatoes 



c. D. myceliophagu.s on mushrocmi mycelium* 



3) Root lesion nematodes 



Pratylenchus penetrans causes root rot in daffodils and 

 other flower bulbs, ornamental plants, strawberries, rasp- 

 berries, potatoes, and in tree nurseries. 



U) Root knot nematodes , mainly in greenhouses on tcmatoes 

 and cucumbers ( Meloidogyne arenaria and M. incognita 

 acrita ) and M, hapla in ornamental plants. 



5) Bud and leaf nematodes 



Aphelencnoides fragariae and A. Ritzemabosi occasionally 

 in ornamental plants . "" 



6) Ectoparasites 



a. Hoplolaimus uniformis is associated with early yellowing 

 of peas and causes damage in carrots. 



b, A Paratylenchus species is of local importance on 

 carrots and celery. 



