------------------------------------------------------ UMR 5558 ----------------
 Author(s) :
             Patrice CADET* & Jean THIOULOUSE**
             Identification of soil factors that relate to plant parasitic nematode
             communities on tomato and yam in the French West Indies.
             Applied Soil Ecology, 8, 35-49.

Key-words : Plant parasitic nematodes, Nematode-soil relationships,
             Co-inertia analysis, Martinique, Dioscorea spp., Lycopersicon
             esculentum.

 Abstract  : A soil and nematode survey of tomato and yam crops was made in
		Martinique (French West Indies). Each sample was divided into two parts,
		one for the nematode study and one for the soil analysis. The coupling
		of the data was made using the coinertia analysis. For tomato plants,
		which were grown from seeds, the nematode-soil relationships were very
		strong. For the two varieties of yams,  Dioscorea cayenensis-rotundata
		and D. alata , whose infested seedtubers carry nematodes into the field,
		the relationships were weaker and depended on the yam variety. For D.
		cayenensis-rotundata, which was attacked by the endemic parasite
		Pratylenchus coffeae, the relationship between nematode community and
		soil type was strong. For D. alata, this relationship was weaker because
		it is mainly parasitized by the exotic species, Scutellonema bradys,
		which is exclusively introduced into the field with the seedtuber,
		whatever the soil type. Soil texture was the most important factor to
		explain the presence of some species, however Meloidogyne spp. and the
		ectoparasitic species such as Xiphinema spp. were associated with light
		andosols; Aorolaimus luci needed, in addition, higher levels of organic
		matter. P. coffeae preferred any type of soil rich in organic matter and
		its abundance seemed influenced by calcium and magnesium content or pH.
		In contrast, P. brachyurus did not appear to be sensitive to any of the
		measured physico-chemical soil characteristics.
 

E-Mail :    thioulou@biomserv.univ-lyon1.fr
             Laboratoire de Biometrie, Genetique et Biologie des Populations
             (UMR 5558) - Univ. C. Bernard LYON I - 69622 VILLEURBANNE CEDEX