Field experiments were carried out in 2008–2009 at the Research Station of the Department of Agronomy in Chylice. The objective of this study was weed control efficacy of two preparations DPX-CDQ 74 (metsulfuron methyl + tifensulfuron methyl) and Granstar 75 WG (tribenuron methyl) in winter wheat (cv. Ludwig and Smuga), triticale (cv. Magnat and Grenado), rye (cv. Warko and Dańkowskie Diament) and spring wheat (cv. Monsun and Żura), barley (cv. Nagradowicki and Justina). The herbicides were applied in the spring at tillering of cereals (BBCH 24–29) while weeds were controlled at the stage in BBCH 14–16/22–23. Herbicides were applied at the doses: DPX-CDQ 74 60 g/ha and 75 g/ha and Granstar 75 WG – 20 g/ha with adiuvant Trend 90 EC in dose 0.05%. Weed infestation in cereals depended on plant species and cultivars. In cereals the dominant weed species were: Papaver rhoeas, Viola arvensis, Veronica agrestis, Galium aparine, Lamium amplexicaule, Matricaria inodora, Stellaria media, Capsella bursa-pastoris (winter) and Chenopodium album, Amaranthus retroflexus and Polygonum spp. (spring). The results of presented research revealed a high level of efficacy (86–100%) of new herbicide DPX-CDQ 74 against dicotyledonous weeds.
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