IN VITRO RESISTANCE OF CONIOTHYRIUM CONCENTRICUM FUNGUS AT THE ACTION OF SOME FUNGICIDES

M. PÂRVU, OANA ROŞCA-CASIAN, C. ROIBU

Abstract: Coniothyrium genus has many pathogen species, like: C. concentricum, C. olivaceum, C. hellebori, etc. Coniothyrium concentricum species frequently attacks Yucca filamentosa species, to which causes leaf spotting. Fungus’ sporulation is made up of pycnidia with oval pycnospores (5 –10 × 3 –6 mm). In our experiments, we studied "in vitro" effect of some fungicides (Sumilex 50 PU, Derosal 50 PU, Topsin 70 PU, Curzate Super C, Tiramet 60 PTS) on the germination and growth of the pathogen species. There were done six repetitions for each experimental variant. Fungicides’ effect was estimated in comparison to the control. Sumilex 50 PU 0,10%, Derosal 50 PU 0,10%, Topsin 70 PU 0,10% fungicides had a total inhibitory effect on the germination and growth of Coniothyrium concentricum fungus. The total inhibitory action of Tiramet 60 PTS fungicide was recorded at 0,05% and of Curzate Super C at a concentration of 0,50%. Fungicides’ inhibitory activity is determinate by the type of the active substance and its concentration in the nutritive medium.
Key words: Coniothyrium concentricum, parasite fungus, fungicide, "in vitro", pycnidium, pycnospores, colony, germination, inhibition.

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