Analysis of potential impaction and phytotoxicity of surfactant-plant surface interaction in pesticide application

Appah, Samuel; Jia, Weidong; Ou, Mingxiong; Wang, Pei; Asante, Eric Amoah

doi:10.1016/j.cropro.2019.104961

Cited by 63 publications

(38 citation statements)

References 65 publications

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“…Most studies consider DCA a key testing parameter for the wetting behavior of a pesticide liquid, with smaller DCA values indicating higher wettability. 36,48 Figure 4(A) shows measured DCA values on cabbage leaf surfaces under different formulations after fresh preparation. As shown in Fig.4(A), the CA decreased noticibly over time, and the most stable nanoemulsion had the lowest CA, changing from extremely non-wetted (50°) to desirably wetted (34°).…”

Section: Wettability On Foliagementioning

confidence: 99%

“…This result is attributed to the strong permeability of the nanoemulsions, which allowed more insecticide solution to pass through the insect's body surface to induce the insecticidal effect. 48,49 3.7 Cytotoxicity of abamectin-loaded nanoemulsion Cell proliferation is an important approach by which to evaluate cytotoxicity. 50 We tested the cytotoxicity of abamectin-loaded nanoemulsions, EC, and ME against DC cells after incubation for 2 and 24 h by MTT assay (Fig.…”

Section: Biological Activity Of Abamectin-loaded Nanoemulsionmentioning

confidence: 99%

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Development of abamectin‐loaded nanoemulsion and its insecticidal activity and cytotoxicity

Feng

Chen

Liu

et al. 2020

Pest Management Science

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BACKGROUND: Owing to the advantages of high-efficiency, environmental protection and safety, nanoemulsions have become a highly popular water-insoluble pesticide delivery system in recent years. RESULTS: In this study, abamectin-loaded nanoemulsion with remarkable physical stability and application performance was obtained by selecting the type and concentration of surfactant and the emulsification method. The optimal formula was 2% abamectin and 5% castor oil polyoxyethylene (EL-40) dissolved in 7.5% hydrocarbon solvent (S-200) made up to 100% with deionized water, which conformed to the quality indicators from the Food and Agriculture Organization (FAO) standards. Droplets on cabbage leaves showed a small dynamic contact angle, which ensured that the resulting nanoemulsion exhibited excellent wettability and diffusivity. Compared with emulsifiable concentrates (EC) and microemulsions (ME), the abamectin-loaded nanoemulsion had the lowest LC 50 (0.0686 mg L −1) to third-instar larva of Plutella xylostella, causing the larval body to blacken and shrivel, which improved insecticidal activity. In addition, the abamectin-loaded nanoemulsion had low cytotoxicity. The viability of dendritic cells with added nanoemulsion reached 100% after 2 h, whereas that of cells with EC and ME was lower. After 24 h, the cell viability of dendritic cells with added ME was 0. CONCLUSION: This research facilitated the design and fabrication of nanoemulsions for water-insoluble pesticide to enhance insecticidal activity, lower cytotoxicity and reduce environmental pollution.

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Section: Wettability On Foliagementioning

confidence: 99%

Section: Biological Activity Of Abamectin-loaded Nanoemulsionmentioning

confidence: 99%

Development of abamectin‐loaded nanoemulsion and its insecticidal activity and cytotoxicity

Feng

Chen

Liu

et al. 2020

Pest Management Science

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“…It is obvious that both species surveyed showed a low droplet contact angle-a trait that indicates that these species have moderately easy-to-wet leaf surfaces. The addition of the adjuvant led to desirable results, because it reduced the contact angle in both species, which led to the better spreading of the droplet and an increased wetted area [11,29,30]. Menendez et al [30] also categorized L. rigidum as a moderately rough-surfaced grass weed, and with the addition of adjuvants was able to lower the glyphosate contact angle values by up to 23% in comparison to the control population, while the leaf coverage and glyphosate uptake was enhanced.…”

Section: Discussionmentioning

confidence: 99%

Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis

Palma-Bautista

Vázquez-García

Travlos

et al. 2020

Plants

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Glyphosate retention, absorption and translocation with and without adjuvant were examined in Lolium rigidum and Conyza canadensis in greenhouse and laboratory settings to develop an understanding of the influence of the selected adjuvant on glyphosate activity. Tests on whole plants show that the dose of herbicide needed to reduce dry weight by 50% (GR50) or plant survival (LD50) decreases by mixing glyphosate and adjuvant to 22%–24% and 42%–44% for both populations of L. rigidum and C. canadensis, respectively. This improvement in efficacy could be attributed to the higher herbicide retention and lower contact angle of the glyphosate + adjuvant drops on the leaf surface compared to the glyphosate solution alone. Plants of both species treated with 14C-glyphosate + adjuvant absorbed more glyphosate compared to non-adjuvant addition. Furthermore, the movement of the herbicide through the plant was faster and greater with the adjuvant. Our results reveal that the use of adjuvants improves the effectiveness of glyphosate in two of the most important weeds in agricultural crops in Mediterranean countries.

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“…There are very many experimental studies of droplets impacting on synthetic surfaces, [6][7][8][9][10][11] but there are far fewer studies of droplets impacting on leaf surfaces over very short time scales. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] This study contributes to this research by reporting on droplet impaction experiments on leaves from two plant species, one artificial surface, and three aqueous formulations.…”

Section: Introductionmentioning

confidence: 95%

“…In summary, this study shows that the volume left behind after a shatter event can be significant and must be taken into account in spraying models as suggested by Dorr et al 3 The presence of pinning should influence the quantity retained but also the spray distribution on leaves, which can affect the spray efficacy. 25 It is clear that the interaction among the drop's liquid-surface and leaf structures plays a major role in impaction outcomes. The exact mechanisms leading to partial drop pinning on a complex surface such as a leaf requires further examination.…”

Section: Actual Classmentioning

confidence: 99%

Image analysis of shatter and pinning events on hard‐to‐wet leaf surfaces by drops containing surfactant

Huet

Massinon

Cock

et al. 2020

Pest Management Science

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BACKGROUND A key challenge for developing computer models of spray retention by plants is to accurately predict how spray drops behave when impacting leaf surfaces. One poorly understood outcome occurs when drops bounce or shatter on impact but leave behind a proportion of the liquid on the surface (designated as pinning). This process is studied via impaction experiments with two hard‐to‐wet leaf surfaces (fat‐hen: Chenopodium album and barnyard grass: Echinochloa crus‐galli L. P. Beauv) and one hydrophobic artificial surface (Teflon) using three liquid formulations. RESULTS Drops that impact upon Teflon underwent pinning shatter events via a well‐known mechanism referred to as receding breakup. Drops impacting on leaf surfaces did not undergo receding breakup because the liquid rim was not in direct contact with the leaf surface when it broke into secondary droplets. However, pinning did occur on plant surfaces via a different mechanism, especially when using formulations containing a surfactant. CONCLUSION Newly developed image analysis and methodology has allowed quantification of the volume fraction pinned to surfaces when drops shatter. The addition of surfactant can increase both the probability of pinning and the pinned volume when drops shatter on fat‐hen or Teflon. However, the surfactants studied did not substantially improve the probability of pinning on barnyard grass. The difference in behaviour between the two leaf surfaces and the underlying mechanism is worth further study. © 2020 Society of Chemical Industry

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Analysis of potential impaction and phytotoxicity of surfactant-plant surface interaction in pesticide application

Cited by 63 publications

References 65 publications

Development of abamectin‐loaded nanoemulsion and its insecticidal activity and cytotoxicity

Development of abamectin‐loaded nanoemulsion and its insecticidal activity and cytotoxicity

Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis

Image analysis of shatter and pinning events on hard‐to‐wet leaf surfaces by drops containing surfactant

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