1. Department of Plant Health; Leibniz-Institute of Vegetable and Ornamental Crops; Theodor-Echtermeyer-Weg 1; Großbeeren D-14979 Germany
2. Faculty of Landscape Architecture, Horticulture and Forestry; University of Applied Sciences Erfurt; Leipziger Strasse 77 Erfurt D-99085 Germany
3. Department of Plant Nutrition; Leibniz-Institute of Vegetable and Ornamental Crops; Theodor-Echtermeyer-Weg 1; Großbeeren D-14979 Germany