Herbicide performance in the control of Conyza spp. where three plant heights

Authors

  • Theodoro Schneider Universidade Federal de Cruz Alta
  • Juliane Nicolodi Camera Universidade de Cruz Alta
  • Jana Koefender Universidade de Cruz Alta
  • Mauro Antônio Rizzardi Universidade de Passo Fundo
  • Mario Antônio Bianchi CCGL Technology
  • Ana Paula Rockenbach Private Practice https://orcid.org/0000-0001-9995-1161

DOI:

https://doi.org/10.14393/BJ-v37n0a2021-53718

Keywords:

Alternative Chemical Control, Application Growth Stage, Horseweed, Resistance.

Abstract

Intensive use of the herbicide glyphosate has led to herbicide resistant Conyza spp. populations. Thus, there is a need to indicate alternative herbicides and the appropriate developmental stage for controlling these populations. This study identifies alternatives for controlling glyphosate-resistant horseweed, with treatment applications at different plant heights. For this purpose, field experiments were conducted in the 2016/17 and 2017/18 crop years. The evaluated treatments were: glyphosate (540 g ae ha-1), glyphosate (1080 g ae ha-1), glyphosate (2160 g ae ha-1), glyphosate (3240 g ae ha-1), glyphosate + 2.4-D (1080 + 1005 g ae ha-1), glyphosate + saflufenacil (1080 + 49 g ae/ai ha-1), paraquat (400 g ai ha-1), diquat (400 g ai ha-1), ammonium glufosinate (600 g ai ha-1), and control (without application). These treatments were applied to plants with a maximum of 5 cm; plants between 6 and 15 cm; and plants between 16 and 25 cm. The results showed that glyphosate did not control weeds, regardless of rate. With the exception of 2,4-D, which needs complementation with sequential application of another contact herbicide, all alternatives were viable for the control of Conyza spp. plants with a maximum height of 5 cm.

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Published

2021-12-29

How to Cite

THEODORO SCHNEIDER, NICOLODI CAMERA, J., KOEFENDER, J., RIZZARDI, M.A., BIANCHI, M.A. and ROCKENBACH, A.P.., 2021. Herbicide performance in the control of Conyza spp. where three plant heights. Bioscience Journal [online], vol. 37, pp. e37091. [Accessed8 August 2022]. DOI 10.14393/BJ-v37n0a2021-53718. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/53718.

Issue

Section

Agricultural Sciences