Research discussed in this paper, describes the evaluation of the biological action on the development of teluric microflora from sugar-beet cultivated soil of two herbicides from the ciclohexan dione class, clethodim and tepraloxidim. In vitro, tepraloxidim and clethodim (0.1 %), weakly inhibited the development of the teluric pathogens Pythium debaryanum, Verticillium dahliae and Fusarium oxysporum and of saprophytic fungi colonies with an antagonistic role, Trichoderma viride, Trichotecium roseumand Cladosporium herbarum. The development of Sclerotinia sclerotiorum colonies was inhibited to a larger percent. Herbicides clethodim and tepraloxidim did not negatively influence the development of the soil bacteria, this phenomenon being reflected by the number of colony forming units present in soil compared to the two controls (hoed and unhoed).
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