Common Lambsquarters Response to Glyphosate across Environments

Sivesind, Evan C.; Gaska, John; Jeschke, Mark; Boerboom, Chris M.; Stoltenberg, David E.

doi:10.1614/wt-d-10-00056.1

Cited by 11 publications

(12 citation statements)

References 38 publications

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“…Esse resultado pode ser atribuído, em parte, às doses utilizadas no trabalho. Doses reduzidas proporcionaram controle adequado de plantas mais jovens, mas não controlaram totalmente plantas em estádios mais desenvolvidos (SIVESIND et al, 2011).…”

Section: Parênquima Paliçádico/lacunosounclassified

Fatores Ambientais Que Afetam a Eficácia De Glifosato: Síntese Do Conhecimento

Vidal

Pagnoncelli

Fipke

et al. 2014

PES

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A presente revisão objetivou organizar e sintetizar o conhecimento disponível na literatura com respeito aos fatores ambientais que afetam a efi cácia do glifosato. Foram abordados os seguintes aspectos: temperatura, umidade relativa do ar, solo, irradiância, disponibilidade de nutrientes e o estado nutricional das plantas, ocorrência de chuva após a aplicação do produto, assim como a interação entre o ambiente e as características morfológicas e fenológicas das plantas. Verifi cou-se que, em geral, temperatura e estado nutricional das plantas ótimos para o crescimento vegetal favorecem a efi cácia do glifosato no controle de infestantes. Umidade relativa do ar superior a 65 % tende a facilitar a absorção do herbicida. Irradiância elevada auxilia a ação de glifosato, mas há espécies vegetais em que o sombreamento parcial favorece o controle com o herbicida. A maioria dos trabalhos da literatura consultados trata da avaliação do efeito de fatores isoladamente. No entanto, como em condições reais ocorre a associação dos fatores de estresse mencionados há a necessidade de trabalhos de campo que avaliem a interação entre eles.

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Section: Parênquima Paliçádico/lacunosounclassified

Fatores Ambientais Que Afetam a Eficácia De Glifosato: Síntese Do Conhecimento

Vidal

Pagnoncelli

Fipke

et al. 2014

PES

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“…Efficacy of the phloem-mobile herbicide glyphosate on sensitive weeds tends to increase at elevated temperatures (Coupland 1983; Franz et al 1997; Jordan 1977; Masiunas and Weller 1988; Waltz et al 2004). However, there are reports of reduced efficacy (Adkins et al 1998b; Tanpipat et al 1997) or no change in efficacy (Devine et al 1983; Sivesind et al 2011). Soil moisture variations also influence glyphosate performance.…”

Section: Introductionmentioning

confidence: 99%

Environmental Factors Moderate Glyphosate-induced Antagonism of POST Herbicides on the Rapid Response Biotype of Glyphosate-Resistant Giant Ragweed (Ambrosia trifida)

Harre

Young

2018

Weed Sci

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In the rapid response (RR) biotype of glyphosate-resistant (GR) giant ragweed (Ambrosia trifidaL.), exposure to glyphosate elicits H2O2production in mature leaves, resulting in foliage loss and reduced glyphosate translocation. When glyphosate is applied with POST herbicides intended to improve control ofA. trifida, the RR to glyphosate has the propensity to antagonize these herbicide combinations. This research documents how transient changes in air temperature, soil moisture, and light intensity during a 6-d period surrounding herbicide application regulate induction of the RR and the effect on POST herbicide interactions with glyphosate. Air temperature had the greatest influence on H2O2accumulation in leaf disks following treatment with glyphosate, as plants at 30 C produced more than twice the amount of H2O2at 2.5 h after treatment compared with 10 C. Plants under field capacity conditions accumulated nearly 50% more H2O2than those at one-third field capacity, while those under no shade had only 18% more H2O2compared with those in a shaded environment. Despite these initial results, dry weight reduction at 21 d after treatment never differed by more than 8% between levels of environmental factors, thus indicating a negligible influence on glyphosate efficacy. The magnitude of glyphosate-induced antagonism was generally greater at 30 C (12% to 21% less than expected control) versus 10 C (11% to 16%) on atrazine, cloransulam, dicamba, and topramezone and was greater at field capacity (20% to 24%) versus one-third field capacity (11% to 15%) on cloransulam and topramezone. These results indicate air temperatures and soil moisture levels conducive to optimal plant growth accelerate the RR to glyphosate, thereby increasing the likelihood of glyphosate-induced antagonism on several translocated herbicides.

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“…Since the introduction of glyphosate, numerous studies have addressed the relationship between its efficacy and environmental conditions. Some studies have found glyphosate to be more effective at higher temperatures, but others have reported the opposite relationship or that high temperatures are completely unrelated to glyphosate tolerance …”

Section: Introductionmentioning

confidence: 99%