@INPROCEEDINGS {MEERMAN:1999, title = {On-farm testing and large scale distribution of nematode-free yam planting material in Southern Nigeria}, author = {Meerman, J. C. and Speijer, P. }, booktitle = {Abstracts of the 14th symposium of the Nematological Society of Southern Africa, Dikhololo, South Africa, 30 May-2 June}, year = {1999}, pages = {54}, }