Glyphosate hormesis in broad-leaved weeds: a challenge for weed management

Nadeem, Muhammad Ather; Abbas, Tasawer; Tanveer, Asif; Maqbool, Rizwan; Zohaib, Ali; Shehzad, Muhammad

doi:10.1080/03650340.2016.1207243

Cited by 33 publications

(12 citation statements)

References 21 publications

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“…The applications were made fractionally and the herbicide's behavior was influenced by the physical and chemical characteristics of the soil. Hormone behavior has been reported for several herbicides such as tebuthiuron, glyphosate, glufosinate ammonium, and 2,4-D in several plant species (Dragićević et al, 2013;Ather Nadeem et al, 2017;Faria et al, 2018). atrazine and that of S. parahyba and T. ciliata treated with sulfentrazone (see Figure 5).…”

Section: Discussionmentioning

confidence: 90%

Arbuscular mycorrhizal fungi activity in the rhizosphere of tree seedlings subjected to residual herbicides

et al. 2023

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Trees occurring on the margins of agricultural areas can mitigate damage from residual herbicides. Rhizospheric microbial activity associated with trees is one of the main remedial capacity indicators. The objective of this study was to evaluate the rhizospheric microbiological activity in tree species subjected to the herbicides atrazine and sulfentrazone via the rhizosphere. The experiment was designed in four blocks and a 6 × 3 factorial scheme. The first factor consisted of six tree species from Brazil and the second of atrazine, sulfentrazone, and water solutions. Four herbicide applications were performed via irrigation. The total dry mass of the plants, mycorrhizal colonization, number of spores, basal respiration of the rhizospheric soil, and survival rate of bioindicator plants after phytoremediation were determined. Trichilia hirta had higher biomass when treated with atrazine and sulfentrazone. Herbicides decreased the microbial activity in Triplaris americana and did not affect the microbiological indicators of Myrsine gardneriana, Schizolobium parahyba, and Toona ciliata. Fewer bioindicator plants survived in soil with Triplaris americana and sulfentrazone. Microbiological indicators were influenced in different ways between species by the presence of herbicides in the rhizosphere.

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Section: Discussionmentioning

confidence: 90%

Arbuscular mycorrhizal fungi activity in the rhizosphere of tree seedlings subjected to residual herbicides

et al. 2023

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“…Conversely, Ammannia did not exhibit any detectable hormetic effect in response to glyphosate exposure. The different responses of the 2 species are plausible because the dose interval that promotes the stimulus can vary between species (Velini et al 2008; Ather Nadeem et al 2017; Brito et al 2018). There are at least 3 potential explanations for our discrepant findings between species: Ammannia may experience a stimulatory effect at concentrations lower than our applied dose range; Ammannia plants may have been too young to experience a stimulatory effect, as this effect can vary among growth stages within 1 species (Velini et al 2008; de Carvalho et al 2013); or Ammannia simply does not experience a stimulatory effect in response to glyphosate exposure.…”

Section: Discussionmentioning

confidence: 99%

Glyphosate Toxicity to Native Nontarget Macrophytes Following Three Different Routes of Incidental Exposure

Sesin

Davy

Stevens

et al. 2020

Integr Envir Assess & Manag

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A major goal of invasive plant management is the restoration of native biodiversity, but effective methods for invasive plant control can be harmful to native plants. Informed application of control methods is required to reach restoration goals. The herbicide glyphosate, commonly applied in invasive plant management, can be toxic to native macrophytes. Our study assessed the response of 2 macrophytes that are endangered in our study area (Ammannia robusta and Sida hermaphrodita) to glyphosate concentrations that mimic incidental exposure from nearby invasive plant control: spray drift of 4 × 10−7% to 5% glyphosate; pulse and continuous immersion in water containing 2 to 41 µg/L glyphosate; and rhizosphere contact with 5%‐glyphosate‐wicked invasive plants. We assessed macrophyte sensitivity at 14‐d postexposure, and quantified abundance of arbuscular mycorrhizal fungi. Glyphosate spray concentrations as low as 0.1% reduced macrophyte growth. Ammannia was more sensitive overall to glyphosate spray than Sida, although sensitivity varied among measured endpoints. Conversely, macrophytes were not affected by immersion in low concentrations of glyphosate or rhizosphere contact with a glyphosate‐wicked plant. Likewise, arbuscular mycorrhizal fungi abundance in roots was similar among glyphosate‐sprayed and control plants. Based on our results, we recommend that invasive plant managers reduce risks to native nontarget plants through implementing measures that limit off‐target spray drift, and consider the feasibility of more targeted applications, such as with wick equipment. Integr Environ Assess Manag 2021;17:597–613. © 2020 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC)

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“…We observed that early treatments in 2021 increased biomass production of common lambsquarters. Hormetic effects, including stimulation of biomass productivity by low doses of glyphosate, have been reported in several crop and weed species (Brito et al 2018), including common lambsquarters (Nadeem et al 2016). Nadeem et al observed a stimulatory effect of glyphosate on common lambsquarters seedling shoot length and seedling biomass up to a concentration of 16 g ae ha −1 .…”

Section: Impact Of Wick Weeding Timing On Common Lambsquarters and Po...mentioning

confidence: 99%

Evaluation of crop-topping strategies to reduce common lambsquarters (Chenopodium album) seed production in potato production systems

Anderson,

White,

McKenzie-Gopsill

2023

Weed Technol

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Potato producers in Canada’s Atlantic provinces of Prince Edward Island (PE) and New Brunswick (NB) rely on photosystem II (PSII)-inhibiting herbicides to provide season-long weed control. Despite this fact, a high proportion of common lambsquarters populations in the region have been identified as resistant to this class of herbicides. Crop-topping is a late-season weed management practice that exploits the height differential between weeds and a developing crop canopy. Two field experiments were conducted in Harrington, PE, in 2020 and 2021 one each to evaluate the efficacy of a different crop-topping strategy, above-canopy mowing or wick-applied glyphosate, at two potato phenological stages, on common lambsquarters viable seed production and potato yield and quality. Mowing common lambsquarters post-flowering decreased viable seed production (72%-91%) in 2020 but increased seed production (78%-278%) in 2021. Mowing had minimal impact on potato marketable yield across cultivars in both years. In contrast, treating common lambsquarters with wick-applied glyphosate had variable impacts on seed output in 2020 but dramatically reduced seed production (up to 95%) in 2021 when treatments were applied pre-flowering. Glyphosate damage to potato tubers was not influenced by timing and resulted in a 14%-15% increase in culled tubers due to black spotting and rot. Our results highlight the importance of potato and common lambsquarters phenology when selecting a crop-topping strategy and demonstrate that above-canopy mowing and wick-applied glyphosate can be utilized for seedbank management of herbicide resistant common lambsquarters in potato production systems.

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Glyphosate hormesis in broad-leaved weeds: a challenge for weed management

Cited by 33 publications

References 21 publications

Arbuscular mycorrhizal fungi activity in the rhizosphere of tree seedlings subjected to residual herbicides

Arbuscular mycorrhizal fungi activity in the rhizosphere of tree seedlings subjected to residual herbicides

Glyphosate Toxicity to Native Nontarget Macrophytes Following Three Different Routes of Incidental Exposure

Evaluation of crop-topping strategies to reduce common lambsquarters (Chenopodium album) seed production in potato production systems

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