Technical performance of some commercial glyphosate‐resistant crops

Pline-Srnić, Wendy A.

doi:10.1002/ps.1009

Cited by 49 publications

(50 citation statements)

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“…In particular, these problems are clearly evident where the technology of genetically modified crops resistant to the broad-spectrum herbicide glyphosate was adopted. For example, it was estimated that 200,000 ha in Tennessee and 4,000-40,000 ha in Delaware were affected by glyphosateresistant C. candensis biotypes, and that soon millions of hectares will be affected in the USA [48][49][50]. Similar considerations can be extended to other weed species, such as Amaranthus palmeri, A. artemisiifolia and A. trifida, which have evolved glyphosate resistant biotypes.…”

Section: Discussionmentioning

confidence: 99%

Germination ecology of Ambrosia artemisiifolia L. and Ambrosia trifida L. biotypes suspected of glyphosate resistance

et al. 2013

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The germination ecology of Ambrosia artemisiifolia and A. trifida glyphosate susceptible biotypes sampled in marginal areas, was compared with that of the same species but different biotypes suspected of glyphosate resistance, common and giant ragweed, respectively. The suspected resistant biotypes were sampled in Roundup Ready® soybean fields. Within each weed species, the seeds of the biotype sampled in marginal area were significantly bigger and heavier than those of the biotype sampled in the soybean fields. A. artemisiifolia biotypes exhibited a similar dormancy and germination, while differences between A. trifida biotypes were observed. A. artemisiifolia biotypes showed similar threshold temperature for germination, whereas, the threshold temperature of the susceptible A. trifida biotype was half as compared to that of the resistant A. trifida biotype. No significant differences in emergence as a function of sowing depth were observed between susceptible A. artemisiifolia and suspected resistant A. trifida biotype, while at a six-cm seedling depth the emergence of the A. artemisiifolia susceptible biotype was 2.5 times higher than that of the A. trifida suspected resistant biotype. This study identified important differences in seed germination between herbicide resistant and susceptible biotypes and relates this information to the ecology of species adapted to Roundup Ready® fields. Information obtained in this study supports sustainable management strategies, with continued use of glyphosate as a possibility.

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Section: Discussionmentioning

confidence: 99%

Germination ecology of Ambrosia artemisiifolia L. and Ambrosia trifida L. biotypes suspected of glyphosate resistance

et al. 2013

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“…Alguns questionamentos ainda são feitos sobre o uso de plantas geneticamente modificadas, dentre eles o grau de tolerância de algumas plantas daninhas ao glyphosate, a interação com a simbiose de microrganismos com as raízes da soja e patógenos de plantas, os efeitos sobre a produção e a interação com as condições ambientais (PLINE-SNIRC, 2005). Grande parte desses fatores também é influenciada pelo manejo da cultura, dificultando isolar os efeitos do glyphosate.…”

Section: Introductionunclassified

“…Foram desenvolvidos experimentos, em condições de campo, nos anos agrícolas 2005 e 2006/2007. Foram avaliadas duas cultivares de soja resistentes ao glyphosate (CD 214 RR e M-SOY 8008 RR), oito tratamentos de herbicidas (glyphosate, em aplicação única, nas doses de 0,48; 0,72; 0,96 e 1,20 kg ha -1 de equivalente ácido, associadas ou não a aplicação sequencial na dose de 0,48 kg ha -1 ), além de duas testemunhas, uma capinada e outra mantida infestada.…”

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Controle de plantas daninhas na cultura de soja resistente ao glyphosate

Correia

Durigan

2010

Bragantia

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RESUMOO objetivo da pesquisa foi avaliar o controle de plantas daninhas em área cultivada com soja resistente ao herbicida glyphosate, sem a utilização de práticas complementares de manejo de plantas daninhas. Foram desenvolvidos experimentos, em condições de campo, nos anos agrícolas 2005 e 2006/2007. Foram avaliadas duas cultivares de soja resistentes ao glyphosate (CD 214 RR e M-SOY 8008 RR), oito tratamentos de herbicidas (glyphosate, em aplicação única, nas doses de 0,48; 0,72; 0,96 e 1,20 kg ha -1 de equivalente ácido, associadas ou não a aplicação sequencial na dose de 0,48 kg ha -1 ), além de duas testemunhas, uma capinada e outra mantida infestada. As cultivares de soja influenciaram na infestação das espécies de plantas daninhas na área. Sem a aplicação de glyphosate, houve o predomínio de X. strumarium na área, desfavorecendo a ocorrência de outras espécies. Quando utilizado glyphosate, independentemente da dose, a infestação contabilizada aos 35 e 40 dias após a primeira aplicação, no primeiro e segundo ano, respectivamente, foi baixa. O controle de plantas daninhas na cultura da soja transgênica é diretamente influenciado pela dose de glyphosate, havendo controle satisfatório com a aplicação única de 0,96 kg ha -1 ou a sequencial de 0,48 + 0,48 kg ha -1 de glyphosate. Em situação de menor infestação (2006/ 2007), a aplicação única de 0,48 kg ha -1 de glyphosate é suficiente para o controle das plantas daninhas. As cultivares de soja transgênica CD 214 RR e M-SOY 8008 RR influenciam diferencialmente a dinâmica das espécies de plantas daninhas, sendo o controle químico mais efetivo na situação de cultivo de M-SOY 8008 RR, em que houve menor diversidade e desenvolvimento das plantas daninhas.Palavras-chave: controle químico, soja transgênica, Xanthium strumarium. ABSTRACT WEED CONTROL IN GLYPHOSATE TOLERANT SOYBEAN CROPThis work evaluated the weed control in glyphosate tolerant soybean crop without additional management practices. Two experiments were carried out under field conditions in the agricultural years 2006/2007 and 2007/2008 in Jaboticabal, São Paulo State, Brazil. It was tested two glyphosate-tolerant varieties (CD 214 RR and M-SOY 8008 RR), eight herbicide treatments (Roundup Ready, single spraying at rates of 0.48; 0.72; 0.96 and 1.20 kg ha -1 of glyphosate acid equivalent, associates or not to sequential spraying at 0.48 kg ha -1 ), and two controls (one under mechanical control and one untreated control). Soybean varieties influenced the infestation of weed species. Xanthium strumarium was predominant in control treatments, reducing the occurrence of other weeds species. Independently of the dose, glyphosate sprayings resulted in low infestations 35 and 40 days after the first spraying, in the first and second year, respectively. The weed control in transgenic soybean is directly influenced for the glyphosate rate, having satisfactory control with the single application at 0.96 kg ha -1 or sequential at 0.48 plus 0.48 kg ha -1 of glyphosate. Under lesser infestation conditions (2006/20...

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“…Glyphosate applied to glyphosate resistant corn after the V6 stage of growth reduced pollen viability, although did not affect corn yield, which was attributed to the cross pollination ability of this crop (Thomas et al, 2004). Glyphosate applied during the reproductive stage of plant development is translocated and accumulated in metabolic sinks, such as reproductive tissues (Pline-Srnic, 2005). Wheat (Triticum aestivum L.) treated with glyphosate at various stages of reproduction development reduced seed kernel weight and lowered germination as compared to nontreated controls (Yenish and Young, 2000), with similar reports for Italian ryegrass (Lolium multiflorum Lam.)…”

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confidence: 96%

Physiological Effects of Late Season Glyphosate Applications on Peanut (Arachis hypogaea) Seed Development and Germination

Grey¹,

Prostko²

2010

Peanut Science

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Field studies were conducted to determine runner type peanut response to glyphosate at 80, 160, 240, 320, and 470 g ae/ha applied 75, 90, and 105 days after planting (DAP) at Plains and Ty Ty Georgia in 2006 and 2007. Data collected included seed kernel mass, peanut pod yield, and seed germination. The two-way interaction between DAP and glyphosate rate was not observed for any variable. Data indicated that glyphosate applied at 75 DAP reduced peanut seed mass to 643 mg/kernel, which was less than the 90 or 105 DAP application masses of 669 and 665 mg/ kernel, respectively. This could be attributed to the timing of that application when peanut was in the beginning of pod fill or R3 growth stage of development. Peanut physiological response to glyphosate was reflected in peanut seed mass. As glyphosate dose increased, peanut seed mass decreased. Seed masses following glyphosate at 80, 160, 240, 320, or 470 g/ha were 669, 674, 662, 645, and 625 mg/kernel, respectively, as compared to 678 mg/kernel for the nontreated control. When glyphosate was applied at 80 or 160 g/ha, peanut pod yield was similar to the nontreated control. At glyphosate rates of 240, 320, and 470 g/ha, peanut pod yield was reduced to 88, 76, and 64% of the nontreated control. Peanut pod yield was reflective of the reductions in seed mass with increasing glyphosate rate which reduced yield. Seed germination was 96% and greater, which indicated that glyphosate applied at any rate or timing did not affect viability compared to the nontreated control.

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Technical performance of some commercial glyphosate‐resistant crops

Cited by 49 publications

References 50 publications

Germination ecology of Ambrosia artemisiifolia L. and Ambrosia trifida L. biotypes suspected of glyphosate resistance

Germination ecology of Ambrosia artemisiifolia L. and Ambrosia trifida L. biotypes suspected of glyphosate resistance

Controle de plantas daninhas na cultura de soja resistente ao glyphosate

Physiological Effects of Late Season Glyphosate Applications on Peanut (Arachis hypogaea) Seed Development and Germination

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