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The study assessed the influence of the plant growth promoter Agro-Sorb Folium and foliar fertilizers Agro-Sorb L-Amino and Agro-Sorb Radiculum, used 4 times at 7-day intervals as foliar spray application on roses grown in a greenhouse, on the development of disease symptoms caused by Podosphaera pannosa. Agro-Sorb Folium and Agro-Sorb L-Amino were applied at the concentrations of 0.25, 0.5 and 1%. Their effectiveness ranged from 64 to 98%. An increase in the concentration of the tested products caused an increase in their effectiveness. Agro-Sorb Radiculum used at the concentration of 0.5% showed an effectiveness of about 85%. The fertilizers Agro-Sorb L-amino and Agro-Sorb Radiculum showed an effectiveness of 21.7% and 64%, respectively after a 2-fold watering treatment, and 17% and 10% after a 4-fold applications. All the tested products used as foliar or watering application caused significant stimulation of the growth of rose shrubs. None of the products caused changes in the appearance of roses (phytotoxicity).

Possibilities of using products containing amino acids in the protection of roses against Podosphaera pannosa and their influence on plant development