V. Yankova*, D. Markova, N. Velkov, S. Masheva Maritsa Vegetable Crops Research Institute, 32 Brezovsko shosse, 4003 Plovdiv, Bulgaria (Manuscript received 22 August 2016; accepted for publication 30 January 2017) Abstract. One of the main problems in cucumber greenhouse production is

A. Yordanov*, S. Tabakov, G. Dobrevska Department of Fruit Growing, Faculty of Viticulture and Horticulture, Agricultural University, 12 Mendeleev, 4000 Plovdiv, Bulgaria Abstract. The study was carried out in the experimental field of the Agricultural University near Plovdiv – Centra