ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


Published in Scientific Papers. Series A. Agronomy, Vol. LX
Written by Anyo MITKOV, Mariyan YANEV, Nesho NESHEV, Tonyo TONEV

A field trial with winter wheat (Triticum aestivum L.), variety ”Enola” was conducted in 2015. The trial was state don the experimental field of the Dobroudja Agricultural Institute, General Toshevo, Bulgaria. The study was performed by the randomized block designin 4 replications. Theaim of the study was to establish the opportunities for singleand combine application of herbicides for weed management at winter wheat. The efficacy of the following 6 herbicides applied alone and in combinations was evaluated: Derby Super (150.2 g/kg florasulam + 300.5 g/kg aminopyralid-potassium), Secator OD (100 g/l amidosulphuron + 25 g/l iodosulfuron + 250 g/l mefenpyr-diethyl), Maton 600 ЕC (600 g/l 2.4 D ester), Pallas 75 WG (75 g/kg pyroxsulam), Hussar Max OD (7.5 g/l mezosulfuron + 7.5 g/l iodosulfuron + 22.5 g/l mefenpyr-diethyl) and Puma Super 7.5 EW (69 g/l fenoxaprop-p-ethyl + antidot). The herbicides were applied in the spring at phenophase end of tillering – beginning of spindling of the winter wheat (ВВСН 29-31). The efficacy of the studied products was recorded by the 10 score visual scale of EWRS (European Weed Research Society). The obtained results were compared with un treated control. The selectivity of the single and combine application of herbicides against the wheat was established by the 9 score scale for phytotoxicity of EWRS. At the particular weed infestation the highest herbicide efficacy and the highest yield (5.78 t.ha-1) were recorded at the variant with combine application of Pallas 75 WG + Derby SuperA

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