Controle químico de milho voluntário resistente ao herbicida glyphosate

Marca, Vinicius; Procópio, S. de O.; Silva, Alessandro Guerra da; Volf, Marcelo Rafael

doi:10.7824/rbh.v14i2.408

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…This limited crop rotation (grains by grains), has impacted on the use of herbicides because the number of applications is doubled per agricultural year (3-5 applications per agricultural summer or winter cycle), since second crop requires similar agricultural tasks to the first crop. This practice has increased the herbicide selection pressure on weed populations, but also have provoked the occurrence of voluntary plants from the previous crop, which are difficult to control because they have a similar herbicide resistance profile as the current crop, reducing the crop yield [78,79].…”

Section: Agronomic Factorsmentioning

confidence: 99%

Herbicide Resistance in Brazil: Status, Impacts, and Future Challenges

Cruz¹,

Oliveira²,

Carvalho³

et al. 2020

Pests, Weeds and Diseases in Agricultural Crop and Animal Husbandry Production

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Brazil is a large producer and exporter of crops in global terms. Weeds may be responsible for ~14% of crop losses, depending on the crop system. Herbicides occupy 58% of the Brazilian pesticide market; however, the continuous use of these products and the high selection pressure have led to the emergence of weeds resistant to herbicides. Today, there are 51 weed species reported as being resistant to herbicides in Brazil, of which 17 involves cross and multiple-resistance. Acetolactate synthase (ALS), acetyl coenzyme A carboxylase (ACCase) and 5-enolpiruvylshikimate-3-phosphate synthase (EPSPs) inhibitors are the herbicidal groups with the most resistance cases. Soybean, corn, rice, wheat and cotton present 30, 12, 10, 9 and 8 cases, respectively, occurring mainly in herbicide-resistant crop fields from the Southern and Central West regions of the country. To better understand the dimensions of herbicide resistance, in this chapter, we will explore the size of agricultural activity in Brazil, the pesticide market and the use of herbicides in the main crops. In addition, the agronomic, scientific-technical and economic aspects that have contributed, directly or indirectly, to the selection of resistant weeds will be discussed in order to have an overview of the economic impact of herbicide resistance management.

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Section: Agronomic Factorsmentioning

confidence: 99%

Herbicide Resistance in Brazil: Status, Impacts, and Future Challenges

Cruz¹,

Oliveira²,

Carvalho³

et al. 2020

Pests, Weeds and Diseases in Agricultural Crop and Animal Husbandry Production

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show abstract

“…The introduction of Roundup Ready® (RR) corn (Zea mays L.) technology on the market has brought benefits to crop management in relation to weed control because it allows the use of glyphosate in post-emergence, which was quickly adopted by most brazilian farmers (ALBRECHT et al, 2014). However, the intensification of these hybrids adoption in the succession system with RR soybean (Glycine max (L.) Merrill) also favored the occurrence of volunteer RR corn plants into soybean crops (MARCA et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Control of volunteer corn with rates of post-emergent ACCase inhibitors applied at different phenological stages

et al. 2020

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The occurrence of volunteer corn (Zea maysL.) has been common in Brazilian crops due to the adoption of a succession of soybean (Glycine max(L.) Merrill) and corn resistant to glyphosate. The aim of this work was to evaluate the control of volunteer corn using different rates of acetyl-CoAcarboxylase (ACCase) inhibitors herbicides at different phenological stages. The experiment was carried out in a greenhouse in a completely randomized design. The experiment was organized in a factorial scheme (3x7x2) with three herbicides (clethodim, quizalofop-P-tefuryl and clethodim + quizalofop-P-ethyl) applied atseven rates [0; 25; 50; 100; 200; 400 and 800 mL of commercial product (C.P.) ha-1], andat two corn phenological stages (V3 and V6). Visual control (%) assessments were carried out at 14, 21 and 28 days after application of treatments (DAT) and shoot dry mass (SDM) at 28 DAT. The data were submitted to analysis of variance and to complementary analysis by logistic regression adjustment. For allherbicides, the control of volunteer corn was greater at V3 stage, requiring lower rates compared to V6. Complete visual control of volunteer corn plants at V3 was obtained with rates of 25 mL C.P. ha-1for all herbicides evaluated, corresponding to 6, 3 and 6 + 3 g a.i. ha-1of clethodim, quizalofop-P-tefuryl and clethodim + quizalofop-P-ethyl, respectively. For V6 application, 400 mL C.P. ha-1of clethodim (equivalent to 96 g a.i. ha-1) and 100 mL C.P. ha-1of quizalofop-P-tefuryl (equivalent to 12 g a.i. ha-1) and clethodim + quizalofop-P-ethyl (equivalent to 24 + 12 g a.i. ha-1) were necessary to achieve 100% of plant mortality. Thus, the efficiency of clethodim was more dependent on the stage of application compared to others herbicides, requiring higher rates to achieve complete control of volunteer corn at V6.

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Controle químico de milho voluntário resistente ao herbicida glyphosate

Cited by 2 publications

References 9 publications

Herbicide Resistance in Brazil: Status, Impacts, and Future Challenges

Herbicide Resistance in Brazil: Status, Impacts, and Future Challenges

Control of volunteer corn with rates of post-emergent ACCase inhibitors applied at different phenological stages

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