Adjuvants and glyphosate activity

Leaper, Craig; Holloway, Peter J.

doi:10.1002/(sici)1526-4998(200004)56:4<313::aid-ps147>3.0.co;2-3

Cited by 47 publications

(15 citation statements)

References 32 publications

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“…After this fraction has penetrated, penetration is likely to be much reduced or to stop altogether 42. Third, hydrophilic surfactants suppress crystallization of glyphosate deposits during droplet drying more than lipophilic surfactants and hence maintain the herbicide in a soluble and more available state for cuticular penetration 43. The results were confirmed by measurements of Coret and Chamel,44 who showed an enhancement of the diffusion rate of glyphosate with increase in the EO chain length of a homologeous nonylphenol surfactant series.…”

Section: Discussionmentioning

confidence: 80%

Studies on a new group of biodegradable surfactants for glyphosate

Haefs

Schmitz-Eiberger

Mainx³

et al. 2002

Pest Management Science

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The effectiveness of a homologous series of biodegradable rapeseed oil derivatives (triglyceride ethoxylates; Agnique RSO series containing an average of 5, 10, 30 and 60 units of ethylene oxide (EO) as adjuvants for foliage-applied, water-soluble, systemic active ingredients was evaluated employing glyphosate as an example. Previous experiments had revealed that the surfactants used are not phytotoxic at concentrations ranging from 1 to 10 g litre-1. The experiments were performed using Phaseolus vulgaris L and nine selected weed species, grown in a growth chamber at 25/20 (+/- 2) degrees C day/night temperature and 40/70 (+/- 10)% relative humidity. The surfactants were evaluated for enhancement of spray retention, and foliar penetration biological efficacy of glyphosate. Glyphosate was applied at a concentration of 43 mM. The surfactants were added at concentrations of 1 g litre-1. The commercial glyphosate 360 g AE litre-1 SL Roundup Ultra and unformulated glyphosate served as references. The surfactants used improved spray retention, foliar penetration and biological efficacy. Some of the formulations were comparable to the performance of Roundup Ultra in the aspects evaluated; some were even more effective in enhancing spray liquid retention and promoting glyphosate phytotoxicity in several plant species. In these studies Agnique RSO 60 generally was most effective.

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Section: Discussionmentioning

confidence: 80%

Studies on a new group of biodegradable surfactants for glyphosate

Haefs

Schmitz-Eiberger

Mainx³

et al. 2002

Pest Management Science

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“…A hydrophilic pathway or channel was originally suggested due to the high weed control efficiency with commercial formulations of hydrophilic herbicides such as glyphosate or paraquat. However, it is important to note that foliar efficacy of such formulations has been optimised through the addition of adjuvants …”

Section: Introductionmentioning

confidence: 99%

Transport properties of the mung bean (Vigna radiata ) non-aerial hypocotyl membrane: permselectivity to hydrophilic compounds

Aponte

Baur

2013

Pest. Manag. Sci.

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Aerial and non-aerial CM differ largely in their absolute barrier properties. This difference is related to the absence of embedded cuticular waxes in the non-aerial hypocotyl membrane, which make the CM physically dense and cause low solubility of hydrophilic solutes. The free volume for diffusion at the interface of the non-aerial hypocotyl cuticle to the environment is much larger resulting in higher penetration rates. It is suggested that diffusion through the non-aerial hypocotyl does not proceed in a real channel system with continuous aqueous phase but is more like transport through a filter with restricted diffusion in the pore openings.

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“…However, foliar uptake of herbicides is a complex process, depending on leaf surface characteristics of plants, physicochemical properties of the chemicals, types and concentration of the AI and additives and environmental conditions 6. This has been well documented, especially for glyphosate,7–9 the most used herbicide worldwide. In the past two decades, glyphosate has been the subject of numerous trials with the aim of enhancing uptake, translocation and biological efficacy of the AI 10–12.…”

Section: Introductionmentioning

confidence: 99%