The aim of the study is to evaluate the effect of phage cocktail or phage cocktail plus soya flour 0.125% to prevent bacterial grain rot in the field conditions. The experiment was randomized in completely block design and included four treatments i.e phage cocktail (consisted 3 phages i.e ФBurAG58, ФBurVL34 and ФBurDT47a), phage cocktail plus soya flour 0.125%, Starner 20 WP, and untreated control. The results showed that all phage treatment expressed significantly lower percentage of infected grain rot and AUDPC than Starner 20 WP treatment and untreated control; and disease reduction ability of these treatments over 50%. In addition, the actual yield of phage mixture plus soya flour 0.125% was significantly higher than the two treatments (Starner 20 WP and untreated control).