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Chemical Control of Glyphosate-Resistant Goosegrass Planta Daninha
TAKANO,H.K.; OLIVEIRA JR.,R.S.; CONSTANTIN,J.; SILVA,V.F.V.; MENDES,R.R..
ABSTRACT: The use of mixtures and rotation of herbicide modes of action are essential for herbicide resistance management. The purpose of this research was to evaluate different pre- and post-emergence herbicides to control goosegrass in soybean and corn. Four greenhouse experiments were conducted, one in pre-emergence and the three others in post-emergence. In pre-emergence, the number of emerged plants and the control percentage at 20, 35 and 50 days after application were evaluated. In post-emergence, the control percentage was evaluated at 14 and 28 days after application on plants with one tiller and four tillers. The use of residual herbicides to control glyphosate-resistant goosegrass is a very important tool for its effective management. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Eleusine indica; Residual herbicides; ACCase inhibithors; Contact herbicides; Application stage.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100256
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Identification and Mapping of Cross-Resistance Patterns to ALS-Inhibitors in Greater Beggarticks (Bidens spp.) Planta Daninha
MENDES,R.R.; OLIVEIRA JR.,R.S.; CONSTANTIN,J.; SILVA,V.F.V.; HENCKS,J.R..
ABSTRACT: Greater beggarticks (Bidens pilosa and Bidens subalternans) biotypes have been under selection pressure of ALS-inhibitors since early 90’s in Brazil. The objectives of this work were to investigate whether there are different cross-resistance patterns among ALS-inhibitors herbicides in Bidens spp. biotypes; to understand the geographic distribution of resistance patterns in grains producing regions in Brazil; and evaluate the possibility of multiple resistance to ALS-inhibitors, EPSPs inhibitor and photosystem II inhibitors. Dose-response experiments were carried out with imazethapyr, chlorimuron and diclosulam in three populations. Sensibility to others 34 populations both from Paraná State (PR) and from others Brazilian regions were also...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Imazethapyr; Chlorimuron; Diclosulam; Bidens subalternans; Bidens pilosa.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100187
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Multiple-and Cross-Resistance of Amaranthus retroflexus to Acetolactate Synthase (ALS) and Photosystem II (PSII) Inhibiting Herbicides in Preemergence Planta Daninha
FRANCISCHINI,A.; CONSTANTIN,J.; OLIVEIRA JR,R.S.; TAKANO,H.K.; MENDES,R.R..
ABSTRACT: Herbicide resistance in Amaranthus genus occurs frequently around the word and has become a big problem in cotton producing areas. The objective of this work was to evaluate cross-and multiple-resistance of redroot pigweed (A. retroflexus) to herbicides used in preemergence in cotton fields in Brazil. Seven dose-response experiments were conducted with herbicides atrazine, prometryn, diuron, S-metolachlor, trifluralin, trifloxysulfuron-sodium and pyrithiobac-sodium, and the treatments consisted of application rates of 0, ¼, ½, 1, 2 and 4 times the recommended label rate. Eight A. retroflexus byotipes with suspect of resistance were sampled for experiments in three brazilian states of cotton producing. Resistance to prometryn was confirmed for one...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Redroot pigweed; Gossypium hirsutum L.; Triazines; Sulfonylureas.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100225
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Glyphosate-Resistant Sourgrass Management Programs Associating Mowing and Herbicides Planta Daninha
RAIMONDI,R.T.; CONSTANTIN,J.; MENDES,R.R.; OLIVEIRA JR.,R.S.; RIOS,F.A..
ABSTRACT: Currently, sourgrass is one of the most important weeds in grain production areas in Brazil. The objective of this work was to evaluate the efficiency of associated systems composed by mowing and chemical control against clumped sourgrass. In the first experiment, different mowing heights (0, 5, 10, 15 and 20 cm), coupled with complementary applications of glyphosate + clethodim, were evaluated on sourgrass control. The second experiment was composed by programs starting with fallow mowing at different times, 50 (early), 35 (intermediate) and 20 (late) days before soybean sowing. After mowing, treatments were followed by herbicide applications according to the need until soybean harvest. The shorter the mowing height associated with herbicide...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Digitaria insularis; Mechanical control; Soybean; Fallow.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100232
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