Gr. Delchev*, M. Georgiev 1Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 28 November 2016; accepted for publication 21 March 2017) Abstract. Chemical control has emerged as the most efficient method of weed

M. Georgieva – Andreeva, K. Tanova, S. Raykov Abstract. During the period 2009-2010 a phytosanitary evaluation of 17 breeds of sorghum from breeding experiment of Agricultural Institute – Shumen, grown at different density, has taken place. The development of bacterial diseases