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The studies were caried out to determine the importance of some weeds occurrence in the flax monoculture the survival of Fusarium oxysporum f. sp. lini. It appearet that the roots of Veronica persica, Stellaria media, Lamium purpureum, Capsella bursa-pastoris and Sonchus arvensis were colonized by Fusarium oxysporum f. sp. lini. V. persica especially has, a profitable influence on the survival of F. oxysporum f. sp. lini. However. C. hursa-pastoris and S. arvensis stimulate the growth of fungi of the genera Trichoderma. which limites the occurrence of F. oxysporum f. sp. lini in the soil.