Browsing by Subject "fluroksipyyri"

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  • Uusitalo, Tuomas (Helsingfors universitet, 2013)
    Sulfonylureas is large, widely, especially in cereal production, used herbicide group since 1980’. Continual unilateral use of sulfonylureas has resulted in development of sulfonylurea resistant weeds. Common chickweed [Stellaria media (L.) Vill.] is common weed in Finland, which is known to have developed sulfonylurea resistance. The aim of this work was to investigate herbicides to control sulfonylurea resistant chickweed as well as to optimize the timing of the weed control. Further attention paid to the effect of weed control to the barley grain yield and its quality. This study was organized as a field experiment in Somero during summer 2012 a randomized complete block design. Sulfonylurea resistant chickweed population was found from this specific field. Experiment included 14 herbicide treatments. One of the herbicides studied was sulfonylurea. Herbicides applied at early and late timing. After treatments, the number of chickweed was counted, its biomass was weighed and N content analysed. Furthermore, the coverage of chickweed and the herbicide efficacy was evaluated visually. Barley was harvested and the grain yield and its quality was analysed. Sulfonylurea Express 50 SX did not control chickweed as effectively as expected. Starane 180 was effective only when 0,6L/ha dosage was used. Ariane S, K-Trio and Primus were effective, with efficacies over 90%. Efficacies of these herbicides were not dependent of timing. Oxyril did not control chickweed as well as was assumed. Efficacy of Oxytril was better when applied at early timing. It seems that the best options to for weed management in case of sulfonylurea resistant chickweed are Starane 180, K-Trio and Ariane S.