Weed management practices for redroot pigweed (Amaranthus retrofexus L.) and smooth pigweed (A. hybridus L.) control in maize

Redroot (Amaranthus retrofexus L.) and smooth pigweed (A. hybridus L.) are troublesome weeds in row crops in Serbia. Both species are very competitive, hosts for pathogens and insects, produce pollen which is highly allergenic; and the most recent research reported herbicide resistance in some popul...

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Veröffentlicht in:Chilean journal of agricultural research 2022-10, Vol.82 (4), p.611-618
Hauptverfasser: Brankov, Milan, Simić, Milena, Tabaković, Marijenka, Vukadinović, Jelena, Djuric, Nenad, Dragičević, Vesna
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Sprache:eng ; por
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Zusammenfassung:Redroot (Amaranthus retrofexus L.) and smooth pigweed (A. hybridus L.) are troublesome weeds in row crops in Serbia. Both species are very competitive, hosts for pathogens and insects, produce pollen which is highly allergenic; and the most recent research reported herbicide resistance in some populations across Serbia. An integrated approach for the control of both Amaranthus species must be evaluated and presented in order to reduce their negative potential in agriculture. In this paper, 9 yr results on redroot pigweed and smooth pigweed weed control are presented. In three different experiments, weed density and biomass of redroot and smooth pigweed were recorded: a) Crop rotation, b) row spacing and time of herbicide application, c) infuence of nozzles and adjuvants. The infuence of crop rotation and PRE herbicide mixture, PRE and POST mixture, and impact of nozzles and adjuvants were evaluated. PRE herbicide mix of S-metolachlor and isoxafutole infuenced 98.1% and 100% effcacy in the maize (Zea mays L.) continuous and in maize rotated with winter wheat (Triticum aestivum L.), respectively. The mixture of two herbicides, applied either in PRE or POST, resulted in 100% of control of both species. Finally, similar results were obtained for nicosulfuron application with extended range (XR) or turbo TeeJet induction (TTI) nozzles, and combined with nonionic surfactant (NIS) or ammonium sulphate (AMS) adjuvants. The novelty of obtained results indicates that only holistic approach based on different weed management practices can contribute to sustainable Amaranthus control.
ISSN:0718-5820
0718-5839
0718-5839
DOI:10.4067/S0718-58392022000400611