Agricultural adjuvants may impair leaf transpiration and photosynthetic activity

Räsch, Anna; Hunsche, Maurício; Mail, Matthias; Burkhardt, J.; Noga, Georg; Pariyar, Shyam

doi:10.1016/j.plaphy.2018.08.042

Cited by 42 publications

(26 citation statements)

References 103 publications

(200 reference statements)

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“…Thus, different surfactants have varying effects on the same plant. A study by Rasch et al (2018) on the effect of surfactants on Brassica oleracea showed similar results. The water permeability of the cuticle of B. oleracea leaves did not recover from the effect of the surfactant polyoxyethylated tallow amine (POEA) and decreased the leaves’ photosynthetic ability, whereas other surfactants applied in the same study showed no effects.…”

Section: Discussionmentioning

confidence: 56%

“…The concentration ratio of surfactant to pesticide has effects on the deposition, wettability, and adhesion of the sprayed pesticide on target surfaces, especially on hydrophobic leaf surfaces (Appah et al, 2019; Bergeron et al, 2000). In addition, the concentration ratio influences cuticular permeability, biocidal activity, and phytotoxicity (Appah et al, 2020; Rasch et al, 2018).…”

Section: General Consideration For Surfactants In Plant Disease Managmentioning

confidence: 99%

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Surfactants in plant disease management: A brief review and case studies

et al. 2020

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In plant disease management, surfactants are generally used in combination with pesticides to facilitate delivery of the pesticide chemicals to the target sites in plants, vectors, or pathogens. Their intended use is rarely for direct effect on plant pathogens. However, trends in recent studies have revealed an appreciable increase in their use for direct management of plant diseases. In this paper, we briefly review the progress made in the use of surfactants for disease management, as adjuvants and when applied for direct effect. We carried out experiments to evaluate the effect of selected synthetic surfactants (Cohere, Kinetic, Silwet‐77, and Induce) on powdery mildew in squash and bacterial spot in tomato. Results from this study showed that the effect of surfactants on these pathogens is dependent on the type of plant pathogen or disease. All tested surfactants exhibited in vitro bactericidal activity against Xanthomonas perforans, a causal pathogen of bacterial spot of tomato. In the greenhouse, Cohere significantly reduced disease severity of powdery mildew in squash compared to the untreated control. Cohere also showed promise in field trials against bacterial spot of tomato, but the other surfactants tested promoted this disease. Our studies demonstrate the importance of evaluating surfactants for their use in management of plant diseases both for direct effect and as adjuvants in tank mix.

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Section: Discussionmentioning

confidence: 56%

Section: General Consideration For Surfactants In Plant Disease Managmentioning

confidence: 99%

Surfactants in plant disease management: A brief review and case studies

et al. 2020

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“…The experimental foxtail millet was manually sown in lines with 20 mm sowing depth, 100 mm seeding distance, and 200 mm inter-row spacing, and the plots were pressed by roller [27]. The ZnO NPs were then suspended in a solution of adjuvant SILWET STAR ® before foliar application because this facilitates penetration of nanoparticles across wax sub-structures [34,35] and also used for control as a “blank” treatment lacking ZnO NPs.…”

Section: Methodsmentioning

confidence: 99%

Effect of Foliar Spray Application of Zinc Oxide Nanoparticles on Quantitative, Nutritional, and Physiological Parameters of Foxtail Millet (Setaria italica L.) under Field Conditions

et al. 2019

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It has been shown that the foliar application of inorganic nano-materials on cereal plants during their growth cycle enhances the rate of plant productivity by providing a micro-nutrient source. We therefore studied the effects of foliarly applied ZnO nanoparticles (ZnO NPs) on Setaria italica L. foxtail millet’s quantitative, nutritional, and physiological parameters. Scanning electron microscopy showed that the ZnO NPs have an average particle size under 20 nm and dominant spherically shaped morphology. Energy dispersive X-ray spectrometry then confirmed ZnO NP homogeneity, and X-ray diffraction verified their high crystalline and wurtzite-structure symmetry. Although plant height, thousand grain weight, and grain yield quantitative parameters did not differ statistically between ZnO NP-treated and untreated plants, the ZnO NP-treated plant grains had significantly higher oil and total nitrogen contents and significantly lower crop water stress index (CWSI). This highlights that the slow-releasing nano-fertilizer improves plant physiological properties and various grain nutritional parameters, and its application is therefore especially beneficial for progressive nanomaterial-based industries.

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“…In relation to targeting efficiency, the addition of adjuvants either in the formulated products or in the tank mixtures has been reported to improve glyphosate absorption and translocation in the plant tissues [1,10]. Surfactants, a common form of adjuvants, increase the deposition and the wetting behavior of the pesticide spray liquid on the leaf tissues, increasing, in this way, the permeability of the active ingredient through the plant surfaces [11].…”

Section: Introductionmentioning

confidence: 99%

Can Control of Glyphosate Susceptible and Resistant Conyza sumatrensis Populations Be Dependent on the Herbicide Formulation or Adjuvants?

Palma-Bautista

Tataridas

Kanatas³

et al. 2020

Agronomy

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In this work, we studied the effect of three glyphosate formulations (isopropylamine, ammonium and potassium salts) and two non-ionic adjuvants on the resistance response of two resistant (R1, R2) and one susceptible population of the highly invasive Asteraceae, Conyza sumatrensis, from Southern France vineyards. Only in R1, an amino acid substitution (Pro106Thr) was found in the enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS). The two adjuvants, in a similar fashion, significantly reduced GR50 values for every population and glyphosate formulation. Without adjuvants, glyphosate as potassium salt was the only formulation able to significantly reduce the GR50 values of every population. For every population, the two adjuvants improved, indistinguishably, leaf retention of the herbicidal solution and the potassium salt formulation led to the highest retention, both with and without the adjuvant added. Uptake responses paralleled those of retention and adjuvant addition was more effective in increasing foliar uptake of the lower performing formulations (isopropylamine and ammonium salts). The allocation pattern of glyphosate among plant compartments was only dependent on population, with R2 retaining most glyphosate in the treated leaf, clearly suggesting the occurrence of a Non-Target Site Resistance (NTSR) mechanism. Results indicate that control of weed populations possessing NTSR mechanisms of resistance to glyphosate may be improved through adequate selection of formulation and adjuvant use.

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Agricultural adjuvants may impair leaf transpiration and photosynthetic activity

Cited by 42 publications

References 103 publications

Surfactants in plant disease management: A brief review and case studies

Surfactants in plant disease management: A brief review and case studies

Effect of Foliar Spray Application of Zinc Oxide Nanoparticles on Quantitative, Nutritional, and Physiological Parameters of Foxtail Millet (Setaria italica L.) under Field Conditions

Can Control of Glyphosate Susceptible and Resistant Conyza sumatrensis Populations Be Dependent on the Herbicide Formulation or Adjuvants?

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