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The aim of this study was to evaluate weed susceptibility to herbicides, applied at reduced doses in spring barley. Two herbicides: Dragon 450 WG (aminopyralid + florasulam) and Granstar Ultra SX 50 SG (thifensulfuron-methyl + tribenuron-methyl) were used in a tank-mixture with the adjuvant Olstick 90 EC at a dose of 1.0 l/ha or Trend 90 EC at the concentration of 0.05%, respectively. Each herbicide was applied in five doses: at the recommended dose, and in 75, 60, 50 and 25% of the recommended one. The experiments were conducted over two growing seasons (2011 and 2012) at the Agricultural Experimental Station of the Institute of Plant Protection – National Research Institute in Winna Gora. The experiments were set up by randomized block design with four replications. The tested herbicides were applied at the full tillering stage of spring barley (BBCH 21–25). During treatment the weed species were at the growth stage of 2–6 true leaves. The most common species of weeds were: Chenopodium album, Viola arvensis, Anthemis arvensis, Stellaria media, Polygonum convolvulus, Veronica arvensis, Cirsium arvense and Galium aparine. The results showed the possibility to reduce the herbicide doses up to 50% while maintaining their high herbicidal effectiveness and good effect on the stability of grain yield.

Response of weeds to different doses of Dragon 450 WG and Granstar Ultra SX 50 SG in spring barley