EN
When the symptoms of powdery mildew had appeared, the rose bushes were sprayed 4 times at 7-day intervals with the fertilizer Solplant PK at a concentration 0.5%. The development of the disease symptoms on control plants progressed rapidly so that after 4 weeks they reached about 5.0 (more than 20% of the surface of the shoots were covered with mycelium). After 2 spray treatments, a significant inhibition in the development of disease symptoms was found on the bushes protected with Solplant PK, and the degree of shoot infection was about 4 times lower than that of the control roses. After the completion of all the treatments, the degree of infection on the roses protected with Solplant PK was, depending on the experiment, 7–10 times lower than on the control plants. The fertilizer Solplant PK used to spray rose bushes proved to have the efficacy similar to that of the fungicide Domark 100 EC.