Phomopsis diachenii belongs to the fungi increasingly noted on herbal plants from Apiaceae family. Considering the documented fungal pathogenicity for herbs, the possibility of limiting the growth and development of P. diachenii was studied. Two biotechnical preparations i.e. Biosept Active and Beta-chikol and 12 fungicides from different chemical groups as well as one isolate of P. diachenii K 651, obtained from caraway were used for the study. Tests were performed by poisoning the culture media with each of the tested preparations, which were then inoculated with the P. diachenii inoculum. The percentage of inhibition of the growth of four- and eight-day-old fungus colonies on the medium with preparations in comparison to the control colonies was a measure of the toxic activity of the preparations. The effectiveness of Beta-chikol in limiting P. diachenii growth was significantly higher than the efficiency of Biosept Active. All fungicides limited the growth and development of P. diachenii, and the effectiveness of inhibitory activity was correlated with the concentration of the active ingredient in fungicide. The most promising compound in reducing the growth and development of P. diachenii was mancozeb.

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