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

Theodoro Schneider; Juliane Nicolodi Camera; Jana Koefender; Mauro Antônio Rizzardi; Mario Antônio Bianchi; Ana Paula  Rockenbach

doi:10.14393/BJ-v37n0a2021-53718

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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