Ill 



CONTENTS 



Pap;e 

 FOrtEwOitD by Chairman, Technical Committee (S-19) I 



PKEFACE by Author III 



Introduction to the plant nematode problems of Western Europe 1 



The cyst forming nematodes, H^terodcra species J. 

 The stem and bulb nematode, Ditylenchus dipsacl 5 



The root lesion (meadow) nematodes, Pratylencnus species 6 

 Tne ectoparasitic nematodes 9 



Estimation of nematode damage 11 

 Control of nematode diseases in Western Europe 



1. Chemical treatment 12 



2. Breeding resistant varieties of crop plants 12 



3. Crop rotation lU 

 Population studies of piant-parasitic nematodes 



X. Kesearcn on Heterooera species lb> 



2, Research on stem nematodes, root lesxon nematoaes, 22 



and Hoplolaimus uniformis 



3« Population dynamics of the stem nematode 23 



U» Population dynamics of the root lesion nematode 26 



is. Population dynamics of HoplolaimnG uniformis 29 



6. Summary ana conclusions 30 



7. Methods for quantitative invpsoip;?.tions on heterodera 31 

 populations 



Keferences cited 3b 





