STUDY OF NEMATODES ASSOCIATED WITH THE VEGETABLE CROPS IN SOME LOCALITIES IN TIARET (WEST OF ALGERIA).

The present study aims to examine the nematode population at some stations of vegetable crops of the province of Tiaret. The results of the study showed various species of nematodes associated with vegetable crops in the Algerian steppe especially the province of Tiaret and Djelfa. We counted eleven genres of phytophagous nematodes represented by Aphelenchus, Aphenchoides, Ditylenchus, Tylenchus, Psilenchus, Pratylenchus, Tylenchorhynchus, Paratylenchus, Cephalobus, Dorylaimus, Rabtidis and Helicotylenchus. The densities of these nematodes vary by location and method of sampling and the nature of the soil. The Cephalobus, Dorylaimus, Ditylenchus and Aphelenchus are the most common and abundant in the three stations of study. These taxa seem to adapt to different types of vegetable soils. Their existence may be subject to significant damage to installed cultures. Furthermore the use of ecological indicators of structure (Frequency and Abundance) class nematodes in 04 groups: • Nematodes abundant and frequent, dangerous for the vegetable crops. • low abundance and frequent Nematodes, less harmful and adapts to different soil types • abundant and infrequent nematodes, their presence in some soils, can be dangerous for the vegetable crops. • Nematodes low abundance and infrequent occasionally meet their densities are low and have little or no damaging. Vegetable crops appear not to be their special host. [ABSTRACT FROM AUTHOR]