Manejo de Conyza bonariensis resistente ao glyphosate: coberturas de inverno e herbicidas em pré-semeadura da soja

Lamego, Fabiane Pinto; Kaspary, Tiago Edu; Ruchel, Q.; Gallon, Mônica da Silva; Basso, Claudir José; Santi, Antônio Luis

doi:10.1590/s0100-83582013000200022

Cited by 27 publications

(26 citation statements)

References 10 publications

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“…The shading of the weed, by cover crop or straw residues, causes the plants to receive basically reflected light and of lower intensity, which will cause a gradual decrease of the photosynthetic rate and consequently a reduction of the same growth. In order to maximize weed control, the use of herbicides in pre-sowing soybean management is associated with the hairy fleabane's cultural management (LAMEGO et al, 2013). The effectiveness of herbicides on glyphosate resistant hairy fleabane is dependent on the stage of weed development, which is a fundamental element for the success of herbicide control (BRESSANIN et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…In addition to herbicides, others practices of integrated weed management can be used, such as sowing time, crop density, rows spacing and fertilization in the growing line. In general, hairy fleabane must be controlled from 24 days after the emergence of soybean (SILVA et al, 2014).Thus, the use of strategies in integrated weed management is essential to contain weed-related costs and environmental resistance and contamination problems in order to maximize weed management (LAMEGO et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

2018

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The interference of glyphosate resistant hairy fleabane (Conyza bonariensis) has caused yield losses in soybean crop. Knowledge of the economic threshold is an important aspect for the economic management of resistant weeds. Because of it, the interference of the glyphosate resistant hairy fleabane density on the soybean yield loss was evaluated, as well as to estimate the economic threshold. Two experiments were conducted to verify the effect of different weed densities on the yield of two soybean cultivars (BRS Estância and BMX Turbo). Weed density ranged from 0 to 124 plants m-2. The yield of the BRS Estância decreased by 1.4% to the increase of one single plant, while for the BMX Turbo the loss was 25.9%. Soybean yield and economic threshold were lower for the BMX Turbo cultivar compared to the cultivar BRS Estância, which can be attributed to the genotype, competitive ability, weed development stage and/or environment. Increases in crop yield expectation, soybean price and herbicide efficiency reduce the economic threshold, indicating that the adoption of control measures should be taken when the weed density is low. Due to the high cost of hairy fleabane control, it is only feasible at high densities.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

2018

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“…Among the species sampled in the present study, horseweed is the one with largest damage, also requiring the control in post-emergence of the crop, which is limited by the increasingly higher resistance of this weed to the use of herbicides (Trezzi et al, 2011;Lamego et al, 2013). In this context, the mapping of weeds has potential, because it is possible to increase the efficiency of the chemical control performed in pre-emergence, by knowing the geographic location of the clumps.…”

Section: Resultsmentioning

confidence: 99%

“…In this context, the association of glyphosate with herbicides that have alternative action mechanism, such as 2,4-D or chlorimuron-ethyl, complemented with an application close to crop sowing of a contact herbicide, such as paraquat+diuron, can reduce the incidence of horseweed resistant to glyphosate (Lamego et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Spatial and temporal distribution of weeds in no-tillage system

Bottega

Pegoraro²,

Guerra

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TBrazil is one of the largest grain producers in the world, due to its extensive arable land and favorable climate for the cultivation of any species. The production could be higher, but problems such as competition between crops and weeds reduces crop yields. This study aimed to analyze the spatial distribution of weeds, especially milkweed (Sonchus oleraceus), horse weed (Conyza spp.) and 'maria-mole' (Senecio brasiliensis) in an area under no-tillage system for two harvests. The work was carried out during the 2013/14 and 2014/15 crop years in an area of 22.5 ha, where soybean is grown in the summer and oat in the winter. The weeds were mapped using a sampling grid of 85 points. The number of plants present in 0.25 m 2 was recorded at each sampling point. The data collected in the field composed the information bank and were used for geostatistical analysis and production of maps. Using geostatistical analysis, it was possible to map the horseweed infestation in the studied area for the 2013/14 season. The species 'maria-mole' and milkweed did not show spatial dependence. During the 2014/2015 season, because of the management carried out in the off season, none of the studied species showed spatial dependence.Distribuição espacial de plantas daninhas em área de plantio direto R E S U M O O Brasil figura como um dos maiores produtores de grãos do mundo em função de suas extensas áreas agricultáveis e do clima favorável ao cultivo de grande número de espécies. A produção poderia ser maior, mas problemas como a competição das culturas com plantas daninhas reduzem a produtividade das culturas. Este trabalho teve por objetivo estudar a distribuição espacial de plantas daninhas em especial serralha (Sonchus oleraceus), buva (Conyza spp.) e maria-mole (Senecio brasiliensis) em área de plantio direto durante duas safras agrícolas. O trabalho foi realizado durante os anos agrícolas de 2013/14 e 2014/15 em uma área de 22,5 ha na qual se cultiva soja no verão e aveia no inverno. Para o mapeamento das plantas daninhas foi utilizada uma grade amostral composta por 85 pontos; em cada ponto amostral foi contabilizado o número de plantas presentes em 0,25 m 2 . Os dados coletados em campo compuseram o banco de informações e foram utilizados para análise geoestatística e produção dos mapas. Utilizando análise geoestatística foi possível mapear a infestação de buva na área de estudos para a safra 2013/14. As plantas daninhas maria-mole e serralha não apresentaram dependência espacial; na safra 2014/2015, em função do manejo realizado na entressafra, nenhuma espécie estudada apresentou dependência espacial.

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“…In the Southern, Southeastern and Central-Western regions of Brazil, the glyphosate-resistant hairy fleabane (Conyza bonariensis, C. sumatrensis and C. canadensis) is considered one of the main weeds in soybean crops, with a potential to cause yield losses up to 40% (Trezzi et al, 2013). In addition, this weed development is favored in no-tillage systems, which is an important system in Brazil (Lazaroto et al, 2008;Lamego et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Eficiência técnica e retorno econômico do manejo de buva resistente ao glyphosate em pré-emergência da soja

et al. 2017

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-The commercial release of the Roundup Ready ® soybean helped the management of weeds and allowed the application of glyphosate during the post-emergence of the culture. However, the intensive use of this herbicide selected resistant hairy fleabane biotypes and hindered control. Many works evaluate the technical effectiveness of herbicides, however, most of the times; the economic return is not analyzed when making decisions about the choice of which herbicide to apply. The aim of this work was to evaluate the technical effectiveness and the economic return of applying herbicide associations and rates in the management of glyphosate-resistant hairy fleabane, in soybean pre-emergence. The experiment was carried out in randomized block design with four replicates. Treatments consisted in associations among glyphosate, 2.4-D, saflufenacil, diclosulam, chlorimuron-ethyl and flumioxazin. The analyzed variables were hairy fleabane control and phytotoxicity on soybean on 7, 14, 21 and 35 days after the application and yield of soybean. The economic return of treatments was calculated according to the cost of the herbicides and the soybean yield. Results about control and yield shows that the association of glyphosate, chlorimuron-ethyl, flumioxazin and 2.4-D and of glyphosate, chlorimuron-ethyl, 2.4-D and saflufenacil presented the best technical effectiveness response and the use of glyphosate, chlorimuron-ethyl and 2.4-D presented the best economic return. However, the increase in chlorimuron-ethyl rates and its association with flumioxazin did not improve the control of hairy fleabane. Keywords: Conyza spp.; control; cost; herbicide association Resumo -

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Manejo de Conyza bonariensis resistente ao glyphosate: coberturas de inverno e herbicidas em pré-semeadura da soja

Cited by 27 publications

References 10 publications

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

Spatial and temporal distribution of weeds in no-tillage system

Eficiência técnica e retorno econômico do manejo de buva resistente ao glyphosate em pré-emergência da soja

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