rieure Agronomique, El Harrach, 16200 Alger, (Algérie) Abstract This study allowed to verify and compare the effectiveness of two treatments; one physical "solarization of the soil" and the other biological "sincocin" applied separately, or associated against root knot nematodes, Meloidogyne javanica on a sensitive egg plant crop (Black Beauty variety). The experiment is conducted in a greenhouse at the experimental station of Ouargla University (Algeria). Soil solarization was done during summer time for four weeks, while the sincocin was sprayed at ground level and all around the roots along with planting and 140 days after. In order to assess the effectiveness of treatments, we estimated the population of Meloidogyne in the soil, the roots and the gall index during and after cultivation. The reaction to treatments was measured according to two factors; the vigor and the average production of plants. The obtained results showed that the separate application of the two treatments resulted in a significant contraction among Meloidogyne populations in roots and soil, at the end of cultivation. Combining the two methods resulted in an even greater contraction; which explains their cumulative effects. Indeed, the number of larvae (L2) is 151.50, 177.75 and 10.75 against 756.25 L2 at the roots, and 126.5, 176.70 and 67.50 again st 973.50 L2 in soil respectively for the sincocin treatment, solarization of the soil and the combination of both techniques compared to witness plants. The gall index observed in the roots is also very low in plants treated with the two associated method s (0.79) compared to those treated only with sincocin (1.42) or solarization (1.54) while being (3.55) among witnesses. All treatments have an equal and positive effect on plant vigor. In fact it was averaged at (3.52) for all treatment methods while it eq ualled 1.18 among witnesses. In addition to that, the average yield per plant was at its highest in plants treated with the combination of the two methods 4.01 Kg/plant, thereby indicating their combined action. This production was averaged at 3.7 Kg /pla nt in plots treated separately and 1.59 Kg/plant among witnesses. Finally, these results caused a 152% gain in plant production when the two methods were combined, 138% and 129% respectively when applying solarization and sincocin

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