Abstract
Wheat cv. Grana grown under field conditions, in the early phase of the first node formation, was sprayed with Ethrel (0.35 ml/m<sup>2</sup>) and with the fungicides: Sportak 45 EC (0.1 ml/m<sup>2</sup>) and Bayleton Triple (0.2 g/m<sup>2</sup>) - separately and in conjunction with Ethrel. It was found that Ethrel reduced the plant's susceptibility to infection by <i>Cercosporella herpotrichoides</i> and by species of the genus <i>Fusarium</i>. The fungicides were more active and also reduced the susceptibility to infection by <i>Erysiphe graminis</i> and <i>Puccinia triticina</i>. The fungistatic effect of Ethrel and Sportak was synergistic only in the case of <i>Cercosporella herpotrichoides</i>. Other interactions between Ethrel and fungicides were not found. Ethrel and fungicides only slightly affected the mycoflora of the root but they completely eliminated the fungi of the genus <i>Mucor</i> from the rhizosphere and reduced the participation of isolates of the genus <i>Alternaria</i> and <i>Cladosporium</i> in the rhizosphere and rhizoplane of wheat. The fungicides were more active than Ethrel. An interaction between Ethrel and fungicides in the reduction of fungi of the genus <i>Fusarium</i> in the rhizosphere was shown.
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