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The aim of this study was to evaluate weed susceptibility to herbicides, applied at reduced doses in winter wheat. The herbicide Lancet Plus 125WG (aminopyralid + piroksysulam + florasulam) was used in a tank-mixture with the adjuvant Olstick 90 EC at a dose of 1.0 l/ha. The herbicide was applied at five doses: at the recommended dose, and at 75, 62.5, 50 and 37.5% of the recommended dosage. Lancet Plus 125 WG at the dose of 0.2 kg/ha was used as a standard. The experiments were conducted in randomized block design with four replications at the Experimental Station of the Institute of Plant Protection – National Research Institute in Winna Gora and on the private farm in Kluczewo Huby during two growing seasons (2010/2011 and 2012/2013). The tested herbicides were applied from the full tillering stage until first node stage of winter wheat (BBCH 25–31). During treatment the weed species were at a growth stage from 14 to 31 according to BBCH scale. The most common species of weeds were: Viola arvensis, Centaurea cyanus, Papaver rhoeas, Brassica napus, Matricaria inodora, Thlaspi arvense and Apera spica-venti. The results showed the possibility to reduce the herbicide doses at range of 25–50%, while maintaining their high herbicidal effectiveness and good effect on the stability of grain yield.

Efficacy of lower doses of aminopyralid + piroksysulam + florasulam (Lancet Plus 125 WG) applied with adjuvant in winter wheat