Estratégias de manejo de inverno e verão visando ao controle de Conyza bonariensis e Bidens pilosa

Neto, Antônio Mendes Oliveira; Constantin, Jamil; Oliveira, Rubem Silvério de; Guerra, Naiara; Dan, Hugo Almeida; Alonso, Diego Gonçalves; Blainski, Éverton; Santos, Geraldo Tadeu dos

doi:10.1590/s0100-83582010000500018

Cited by 33 publications

(19 citation statements)

References 16 publications

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“…Therefore, as an example of chemical control of this plant, Oliveira Neto et al (2010) evaluated the effectiveness of management strategies during the winter after the maize harvest, and summer management prior to soybean planting, on the horseweed control, using a mixture of glyphosate +2.4-D combined or not with residual herbicides. The authors found out that, in all management systems where the herbicide 2,4-D was associated with glyphosate, all weeds were controlled.…”

Section: Resultsmentioning

confidence: 99%

Allelopathic effects of pathogenic fungi on weed plants of soybean and corn crops

Spiassi¹,

Nóbrega²,

Rosa³

et al. 2015

Biosci. J.

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ABSTRACT:The herbicides application can be reduced with alternative methods, as pathogenic fungi use, that produces several secondary compounds in growth medium, which has phytotoxicity. Thus, the aim of this study was to determine the allelopathic activity of culture filtrate produced by pathogenic fungi: Fusarium solani, Macrophomina phaseolina Fusarium graminearum and Diplodia maydis, on germination and development of horseweed (Conyza canadensis), hairy beggarticks (Bidens pilosa) and wild poinsettia (Euphorbia heterophylla). This effect was also tested on soybean and corn crops. The experimental design was completely randomized with twenty treatments (four filtrates of fungi culture, with 0, 5, 10, 15 e 20% concentrations) and four replications. Data were submitted to analysis of variance and regression. The results indicated that filtered of Fusarium solani culture presented a negative effect on horseweed, hairy beggarticks and wild poinsettia without affecting negatively soybeans crop. Diplodia maydis provided some reduction on horseweed and wild poinsettia growth without causing damage to maize crop.The while Macrophomina phaseolina filtrate decreased a seedlings growth of wild poinsettia without affecting negatively corn. This suggests filtrates can be used to control weeds in a sustainable ecological way as well as an alternative to reduce herbicides application, thus, protecting the environment.

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Section: Resultsmentioning

confidence: 99%

Allelopathic effects of pathogenic fungi on weed plants of soybean and corn crops

Spiassi¹,

Nóbrega²,

Rosa³

et al. 2015

Biosci. J.

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“…The increase of the herbicide dosage in radish biotypes resistant to herbicides that inhibit the ALS enzyme may make its use impracticable, and the use of alternative herbicides for the control may be recommended in order to minimize the negative effects they have on the crops (Monjardino et al, 2003;Pandolfo et al, 2013), besides avoiding the selection of new resistant biotypes (Oliveira Neto et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Resistence of Radish Biotypes to Iodosulfuron and Alternative Control

et al. 2016

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-The repetitive use of iodosulfuron for the control of weeds in winter cereals in the south of Brazil has favored the emergence of resistant Raphanus sativus biotypes. The objective of this study was to evaluate: the response of Raphanus sativus biotypes susceptible and resistant to different dosages of iodosulfuron; the control of biotypes with alternative registered herbicides for the control of the species in crops of wheat, corn and soybean; and the existence of cross-resistance of the biotypes. Thus, four experiments were done in a greenhouse, with a completely randomized design and four replicates. The experimental units were composed of vases with a volumetric capacity of 0.75 L filled with substrate, containing a plant each. For the dose-response curve, three biotypes (factor A) and nine doses of the iodosulfuron herbicide (factor B) were used. For the alternative control, the recommendation was herbicides in pre or postemergence of the crops, and the crossedresistance was evaluated by using herbicides that inhibit the ALS enzyme of different chemical groups. The analyzed variables were control and shoot dry matter. GR 50 of the susceptible biotype (B 1 ) was 0.11 g a.i. ha -1 , whereas GR 50 of resistant biotypes (B 4 and B 13 ) was 102.9 and 86.8 g a.i. ha -1 of the iodosulfuron herbicide, respectively. The resistant biotypes presented crossed resistance to herbicides that inhibit the ALS enzyme, where the control can be efficient with the use of herbicides with different action mechanisms. Keywords:Raphanus sativus, dose-response, acetolactate synthase, weed. RESUMO -O uso repetido do herbicida iodosulfurom para controle de plantas daninhas em cereais de inverno no Sul do Brasil favoreceu o surgimento de biótipos de Palavras-chave:Raphanus sativus, dose-resposta, acetolactato sintase, planta daninha.

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“…Oliveira Neto et al (2010) highlight in their study that the combination of post-harvest autumn management of secondseason maize with the sowing of oat to cover the soil in the offseason (August to October) led to benefits in the control of not only horseweed, but also of other weeds.…”

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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Estratégias de manejo de inverno e verão visando ao controle de Conyza bonariensis e Bidens pilosa

Cited by 33 publications

References 16 publications

Allelopathic effects of pathogenic fungi on weed plants of soybean and corn crops

Allelopathic effects of pathogenic fungi on weed plants of soybean and corn crops

Resistence of Radish Biotypes to Iodosulfuron and Alternative Control

Spatial and temporal distribution of weeds in no-tillage system

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