The inventory of nematodes associated with Alfa in the natural reserve of Mergueb located in Ain Elhadjel- Wilaya of M\'Sila (35 � 35\' N 03 � 56\' E), characterized by a semi arid bioclimate, revealed the diversity of thirteen genus. In a second area, the experimental station ITAFV M�d�a (36 � 11 \' N; 02 � 50\' E) located in the semi-arid bioclimatic stage, seventeen genus of nematodes found in the differents vineyard soils. These nematode genus divided according to their diets in four trophic groups: phytophagous (Paratylenchus sp. Tylenchorhynchus sp., Pratylenchus sp., Nothotylenchus sp. and Xiphinema sp., the fungivorous (Aphelenchus sp., Tylenchus sp., and Ditylenchus sp.), the bacteriovorous (Rhabditis sp., Cephalobus sp. and Chiloplachus sp.) and omnivorous predator (Dorylaimus sp. and Discolaimus sp.) while the nematode�s densities vary depending to the study sites. This study of nematode populations associated with Vine and Alfa in the northerrn of Algeria, allowed us to enhance the effect of the predatory nematodes Mononchida order. Our investigations have focused on a set of eight stations. The results express the degree of predation of nematodes by the Mononchida order on different trophic groups of nematodes while Mononchus is positively correlated to the bacterivorous and fungivorous nematodes but negatively to plant parasitic nematodes.\r\nKey � words: Trophic Group, Predation, Alfa, Vine. Mononchida

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