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The study evaluated the effectiveness of the Agro-Sorb Folium plant growth stimulant and Domark 100 EC and Discus 500 WG fungicides used individually or in a mixture for spraying 4–6 times ‘Aga’ rose bushes grown in a greenhouse in the protection against powdery mildew (Podosphaera pannosa). Agro-Sorb Folium used at a concentration of 1% in a mixture with the fungicide Domark 100 EC at concentrations of 0.01%, 0.02%, 0.03%, 0.04% and 0.05%, showed, after four spray treatments, an efficacy of 93.2–100% depending on fungicide concentration. After spraying six times, Agro-Sorb Folium in a mixture with the same fungicide, depending on its concentration, showed an efficacy of 88– 97.8%. By comparison, after forth spray treatments, Agro-Sorb Folium used at a concentration of 1% in a mixture with the fungicide Discus 500 WG at concentrations of 0.012%, 0.024% and 0.03% showed an efficacy of 96–100%. After spraying six times, Agro-Sorb Folium in a mixture with the same fungicide in the tested concentrations showed an efficacy of 93.2–96%. As the concentration of the fungicides increased, the effectiveness of the tested mixture also increased. The study showed the possibility of lowering the concentrations of the fungicides by up to 80% by using them in a mixture with Agro-Sorb Folium at a concentration of 1%, while maintaining, or even increasing, their efficacy compared to individual use. Agro-Sorb Folium at a concentration of 1% used in a mixture with the fungicides, depending on their concentration, caused an increase in fresh weight of 11.3–23.8%, compared to control plants. There were no symptoms of phytotoxicity on rose bushes after using the tested agents and their mixtures.

Evaluation of the effectiveness of Agro-Sorb Folium and its mixtures with fungicides in the protection of roses against powdery mildew