Factors affecting glyphosate activity in <i>Imperata cylindrica</i> (L) Beau, and <i>Cyperus votundus</i> L. I. Effect of soil moisture

Moosavi-Nia, H.; Doré, Jean-Christophe

doi:10.1111/j.1365-3180.1979.tb01586.x

Cited by 23 publications

(6 citation statements)

References 15 publications

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“…Plant height and growth stage at the time of glyphosate application was shown to affect the susceptibility and tolerance of common lambsquarters (Schuster et al 2007;Sivesind et al 2011). Differences in soil moisture affected glyphosate absorption and translocation (Moosavi-Nia and Dore 1979;Waldecker and Wyse 1985), and temperature and relative humidity influenced uptake and translocation of glyphosate (Sharma and Singh 2001). Throughout this study, greenhouse environmental conditions, daily watering, weekly fertilizing, plant height, and growth stage at the time of glyphosate application were all monitored and kept constant across experiments.…”

Section: -------------------------------Dry Weight (% Control) ------mentioning

confidence: 99%

Response of Giant Ragweed (Ambrosia trifida), Horseweed (Conyza canadensis), and Common Lambsquarters (Chenopodium album) Biotypes to Glyphosate in the Presence and Absence of Soil Microorganisms

2012

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In previous research conducted on nonweed species, the efficacy of glyphosate was shown to be greater in unsterile soils compared to sterile soils and soil microorganisms were found to play an important role in glyphosate efficacy. Conducting greenhouse studies in microbe-free soil may therefore produce unreliable data, leading to erroneous conclusions. The objective of this study was to determine the effect of soil microorganisms on the response of glyphosate-resistant and -susceptible biotypes of three problematic weeds of the midwestern United States: giant ragweed, horseweed, and common lambsquarters. A greenhouse dose–response study was conducted on each of the three weed species grown in sterile and unsterile field soil, and the dry weight response of roots and shoots was measured. The three weed species responded differently to glyphosate when grown in the sterile and unsterile soil; that is, in the presence and absence of soil microbes. Soil microbes influenced the response of the susceptible and resistant giant ragweed biotypes and the susceptible common lambsquarters, but not the tolerant common lambsquarters or either horseweed biotype. The different responses of the three species to glyphosate in the presence and absence of soil microbes demonstrates that rhizosphere interactions are fundamental to the mode of action of glyphosate. These findings suggest that the range of tolerance to glyphosate observed in weeds and the evolution of resistance in weed biotypes may also be influenced by rhizosphere interactions. The soil media used in dose–response screenings to identify susceptible and resistant weed biotypes is very important. Unsterile field soil should be incorporated into growth media when conducting dose–response screenings to avoid false-positive results. In addition, researchers performing glyphosate dose–response assays should be aware of these findings.

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Section: -------------------------------Dry Weight (% Control) ------mentioning

confidence: 99%

Response of Giant Ragweed (Ambrosia trifida), Horseweed (Conyza canadensis), and Common Lambsquarters (Chenopodium album) Biotypes to Glyphosate in the Presence and Absence of Soil Microorganisms

2012

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“…Freqüentemente, a absorção de herbicidas é reduzida em folhas de plantas em estresse hídrico, pois as folhas perdem a turgescência e enrolam-se, reduzindo a área superficial de interceptação e/ou retenção dos herbicidas (Kidder & Behrens, 1988, 1991. Moosavi-nia & Dore (1979) Vasos com capacidade para 1 dm 3 foram preenchidos com terra de um solo Planossolo Hidromórfico Eutrófico, anteriormente analisado química e fisicamente (Tabela 1). A calagem e adubação da terra foram baseadas na análise físico-química e de acordo com as recomendações técnicas de adubação e calagem para a cultura da soja (Rolas, 2004).…”

Section: Introductionunclassified

Teores de água no solo e eficácia do herbicida glyphosate no controle de Euphorbia heterophylla

Zanatta¹,

Procópio

Manica³

et al. 2007

Planta daninha

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RESUMO -Um experimento em casa de vegetação foi realizado com os objetivos de avaliar a eficácia do herbicida glyphosate no controle de Euphorbia heterophylla se desenvolvendo em solo com diferentes teores de água e determinar qual o menor teor de água do solo que não prejudica a ação desse herbicida no controle dessa planta daninha. O delineamento utilizado foi o de blocos casua lizados em esquema fatorial 6 x 5, sendo seis intervalos entre a última irrigação e a aplicação do herbicida (0, 6, 12, 24, 48 e 72 horas) e cinco doses de glyphosate (0, 180, 360, 720 e 1.080 g ha -1 ). Quando as plantas atingiram estádio de três pares de folhas, foram aplicados 10 mm de chuva simulada, conforme tratamento previsto. Ao término do período de simulação de chuva, aplicou-se o herbicida com pulverizador costal pressurizado com CO 2 , utilizando-se volume de calda de 120 L ha -1 . Aos 7, 20, 34 e 41 dias após aplicação (DAA), foram avaliados o controle (por escala visual) e, aos 41 DAA, a massa seca de raízes e da parte aérea. Após análise dos dados, verificou-se que a partir da dose de 720 g ha -1 de glyphosate obteve-se controle satisfatório de E. heterophylla, independ entemente do intervalo entre a última irrigação e a aplicaçã o do herbicida. Pulverizações de 360 g ha -1 de glyphosate a intervalos menores que 48 horas entre a última irr iga ção e sua aplicação e em sol o com teor de água maior que 0,09 cm 3 cm -3 nã o prejudicaram a eficácia do herbicida. A aplicação de 180 g ha -1 de glyphosate a intervalos menores que 12 horas entre a última irrigação e sua aplicação e em solo com teor de água superior a 0,14 cm 3 cm -3 não afetou a eficácia do herbicida. Palavras-chave: inibidores de EPSPs, déficit hídrico, planta daninha. ABSTRACT -A greenhouse experiment was carried out to evaluate the efficacy of glyphosate in controlling Euphorbia heterophylla growing under different soil moisture levels and to determine the lowest soil moisture level failing to prevent herbicide effectiveness in controlling this weed.The experiments were arranged in a randomized block design in a 6 x 5 factorial scheme, corresponding to six intervals between the last irrigation and herbicide application (0, 6, 12, 24, 48 and 72 hrs) and five glyphosate doses (0, 180, 360, 720, and 1.080 g ha -1

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“…], purple nutsedge (Cyperus rotundus L.), wild oat (Avena fatua L.), liverseed grass (Urochloa panicoides Beauv. ), and awnless barnyard grass [Echinochloa colona (L.) Link] [11,12,[19][20][21][22][23]. The possible mechanism associated with the reduced activity of glyphosate is related to alterations in herbicide retention, absorption, translocation, and/or metabolism due to changes in leaf thickness, leaf area, and stomatal conductance [20,22,23].…”

Section: Introductionmentioning

confidence: 99%

“…), and awnless barnyard grass [Echinochloa colona (L.) Link] [11,12,[19][20][21][22][23]. The possible mechanism associated with the reduced activity of glyphosate is related to alterations in herbicide retention, absorption, translocation, and/or metabolism due to changes in leaf thickness, leaf area, and stomatal conductance [20,22,23]. These morphological and physiological changes in the leaf architecture and surfaces, which alter herbicide absorption, translocation, and metabolism, reduce the efficacy of glyphosate under moisture-deficit stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Moisture Regimes on the Glyphosate Sensitivity and Morpho-Physiological Traits of Windmill Grass (Chloris truncata R.Br.), Common Sowthistle (Sonchus oleraceus L.), and Flaxleaf Fleabane [Conyza bonariensis (L.) Cronq.]

Peerzada

Williams

O’Donnell

et al. 2021

Plants

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The glasshouse study was conducted with the objectives of (i) investigating the effect of soil moisture variations on the control efficiency of glyphosate on windmill grass (Chloris truncata R.Br.), common sowthistle (Sonchus oleraceus L.), and flaxleaf fleabane [Conyza bonariensis (L.) Cronq.], (ii) evaluating the tolerance of tested weed species under soil moisture variations, and (iii) determining the morphological and physiological characteristics of these species to partially explain herbicide tolerance under periods of reduced soil moisture availability (RSM). The species’ tolerance to glyphosate increased significantly under reduced soil moisture availability (p < 0.001). The lethal dose to cause herbicide injury or biomass reduction by 50% (LD50) and 80% (LD80) in relation to untreated control for water-stressed plants [i.e., moderate soil moisture availability (MSM) and RSM] was significantly higher than that of plants grown under high soil moisture availability (HSM). The tolerance factor (TF) for C. truncata, S. oleraceus, and C. bonariensis, in terms of biomass reduction under RSM, was 2.6, 2.4, and 2.6, respectively, as compared to HSM. The results showed that the glyphosate sensitivity, especially at the sub-lethal rates, of the three weed species under study decreased as soil moisture availability reduced (p< 0.01). Overall glyphosate efficacy, in relation to the recommended rate, was unaffected, except for C. truncata; the weed survived the highest tested glyphosate rate [750 g active ingredient (a.i.) ha−1] under RSM. There was significant interaction between weed species and soil moisture regimes for weed morpho-physiological traits (p < 0.001), with reduced soil moisture having a more influential impact on the growth of C. bonariensis and S. oleraceus compared to C. truncata. Changes in the leaf characteristics, such as increased leaf thickness, higher leaf chlorophyll content, reduced leaf area, and limited stomatal activity for all the tested weed species under MSM and RSM in relation to HSM, partially explain the tolerance of species to glyphosate at sublethal rates.

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Factors affecting glyphosate activity in Imperata cylindrica (L) Beau, and Cyperus votundus L. I. Effect of soil moisture

Cited by 23 publications

References 15 publications

Response of Giant Ragweed (Ambrosia trifida), Horseweed (Conyza canadensis), and Common Lambsquarters (Chenopodium album) Biotypes to Glyphosate in the Presence and Absence of Soil Microorganisms

Response of Giant Ragweed (Ambrosia trifida), Horseweed (Conyza canadensis), and Common Lambsquarters (Chenopodium album) Biotypes to Glyphosate in the Presence and Absence of Soil Microorganisms

Teores de água no solo e eficácia do herbicida glyphosate no controle de Euphorbia heterophylla

Effect of Soil Moisture Regimes on the Glyphosate Sensitivity and Morpho-Physiological Traits of Windmill Grass (Chloris truncata R.Br.), Common Sowthistle (Sonchus oleraceus L.), and Flaxleaf Fleabane [Conyza bonariensis (L.) Cronq.]

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