Wetting and adhesion behavior on apple tree leaf surface by adding different surfactants

Gao, Yue; Lu, Junjiao; Zhang, Pengjiu; Shi, Gaochuan; Ying, Lei; Zhao, Jimin; Liu, Zhongfang; Yang, Jing; Du, Fengpei; Fan, Rong

doi:10.1016/j.colsurfb.2019.110602

Cited by 18 publications

(20 citation statements)

References 24 publications

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“…The drying speed of pesticide sprays directly affects the efficacy of insecticides against pest control. 53,54 Figure 4 shows the drying kinetics of self-prepared nanoemulsion (A) and commercial EW (B) and EC (C). The insets in Figure 4A gives a schematic interdiffusion/coalescence processes between droplets.…”

Section: Effects Of Emulsifier Types On Nanoemulsionmentioning

confidence: 99%

Development and Characterization of Pyriproxyfen-Loaded Nanoemulsion for Housefly Control: Improving Activity, Reducing Toxicity, and Protecting Ecological Environment

Feng

Chen

et al. 2021

ACS Sustainable Chem. Eng.

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Nanoemulsion provides an effective way for the efficient, safe, and environmentally friendly use for pesticides. In this study, the influence of the type, dosage of emulsifier, and emulsifying process on the formation and stability of nanoemulsion were investigated. On this basis, the optimal nanoemulsion formula loaded with pyriproxyfen was obtained. Pyriproxyfen (5%) and polyoxyethylene castor oil ether (6%; EL-20) were dissolved in hydrocarbon solvent (5%; S-100) with deionized water replenished to 100%. Compared with oil-in-water emulsion (EW) and emulsifiable concentrate (EC), the longest drying time ensured that the nanoemulsions had a more durable control effect. The pyriproxyfen-loaded nanoemulsions had a high pupation inhibition rate and 100% eclosion inhibition rate. In addition, at 7 and 14 days, the 50% lethal concentrations (LC 50 ) of pyriproxyfen-loaded nanoemulsions to Eisenia fetida were 1450.63 and 804.19 mg/kg, respectively, indicating their low acute toxicity to earthworms and environmental friendliness. Moreover, the pyriproxyfen-loaded nanoemulsions showed a low apoptosis rate (5.29%), whose value was considerably lower than that of EW (29.51%) and EC (9.45%), indicating a low toxicity to human hepatocyte L02 cells. This research facilitated the design and fabrication of nanoemulsions for water-insoluble pesticides to enhance the insecticidal activity, lower the cytotoxicity, and reduce environmental pollution of such chemicals.

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Section: Effects Of Emulsifier Types On Nanoemulsionmentioning

confidence: 99%

Development and Characterization of Pyriproxyfen-Loaded Nanoemulsion for Housefly Control: Improving Activity, Reducing Toxicity, and Protecting Ecological Environment

Feng

Chen

et al. 2021

ACS Sustainable Chem. Eng.

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“…16 Wetting states of droplets on a leaf surface generally include the Cassie Baxter and Wenzle states, which are used by researchers to evaluate wettability and the adhesion of droplets. 17 Some studies have explored the wetting behavior of wheat and fruit trees at different growth stages, 18,19 but few have examined the wetting behavior of diseased leaf surfaces. The main parameter used to evaluate the dynamic wetting behavior of droplets on microstructured leaf surfaces is contact angle hysteresis, 20 that is, the difference between the advancing and receding contact angles, and it is also an important parameter to show that the microstructure of a leaf surface matches the properties of the solution.…”

Section: Introductionmentioning

confidence: 99%

Performance matching between the surface structure of cucumber powdery mildew in different growth stages and the properties of surfactant solution

Ding

Waterhouse

et al. 2021

Pest Management Science

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BACKGROUND: Understanding performance matching of pesticide droplets on the surface of cucumber leaves modified by powdery mildew is of practical importance for the agricultural sector. Here, the surface texture and wettability of cucumber leaves covered by powdery mildew were systematically examined using parameters such as micromorphology, physicochemical properties, and liquid droplet contact angle measurements. RESULTS: Our results show that powdery mildew growth can be divided into four distinct stages according to the surface texture characteristics of the diseased cucumber leaves. The three-dimensional (3D) surface structures of powdery mildew layers on cucumber leaves had individual characteristics at different mildew growth stages, among which powdery mildew was more easily spread in the last growth stage, and powdery mildew height was greatest in the NO. 2 growth stage (S a = 425.35 ∼m). Surface free energy values, static contact angle, and contact angle hysteresis all correlated strongly with the surface characteristics of powdery mildew layers at different growth stages. When the concentration of surfactant reached the critical micelle concentration, the wetting state of AEO-5 solution droplets on the surface of cucumber powdery mildew leaves reached the Wenzel state more easily. The wettability of a droplet on the leaf surface depends on the state of the monomer and micelle in the surfactant solution and the surface characteristics of the powdery mildew-covered leaf.CONCLUSION: The 3D structure and relative dielectric constant of powdery mildew-covered leaves influenced surface texture characteristics, which in turn controlled the wetting and matching ability of surfactant droplets on diseased leaves. This work provides valuable new insights into the matching of the structure of powdery mildew-covered plant leaves with the properties of surfactant solutions.

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“…Decrease the DST and CA can improve the wetting deposition of the liquid on the target surface, improve the penetration and transmission of active ingredients, and improve the control efficacy [22] . Therefore, the DST and CA values on maize leaves were used to select adjuvants to improve the efficacy of field experiments.…”

Section: Wettability Properties Experimentsmentioning

confidence: 99%

Optimization of aviation adjuvants based on wettability analysis for insecticide application on maize using UAV

Zhang¹,

Zhou²,

Zhang³

et al. 2021

International Journal of Agricultural and Biological Engineering

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Adjuvants can increase the control efficacy of diseases and insect pests by changing the physico-chemical properties of pesticides. Most of the aviation spray adjuvants are versions of ground adjuvants. Maize insecticide sprays with unmanned aerial vehicles (UAV), have problems such as relatively low droplet deposition rate and poor wettability. Hence, wettability research and optimization tests for aviation spray adjuvants are needed. The present study screened 12 spray adjuvants using physico-chemical property experiments. The adjuvants were applied to improve the droplet deposition and control efficacy in maize borers controlling by UAV. The selected spray adjuvants were Po2 (a hyperbranched polymer adjuvant) and VO3 (a vegetable oil adjuvant). Results showed that, (1) When Po2 was added in water-dispersible granules (WGs) at volume rate of 12 L/hm 2 , the dynamic surface tension (DST) of WGs was decreased by 37.41%, and the maize leaves were covered by droplets 100%, the droplet deposition was increased by 104% and maize borer control was increased by 46%;(2) VO3 decreased the surface tension of ultra-low-volume (ULV) formulation by 12.02% and the maize leaves were covered by droplets 100%. The effect of VO3 on improving the droplet deposition and control efficacy at 12 L/hm 2 with ULV was not significant. Thus, the addition of aviation spray adjuvant to improve the wettability of WGs significantly improved the droplet deposition and control efficacy but it had no significant effect on the ULV formulation.

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Wetting and adhesion behavior on apple tree leaf surface by adding different surfactants

Cited by 18 publications

References 24 publications

Development and Characterization of Pyriproxyfen-Loaded Nanoemulsion for Housefly Control: Improving Activity, Reducing Toxicity, and Protecting Ecological Environment

Development and Characterization of Pyriproxyfen-Loaded Nanoemulsion for Housefly Control: Improving Activity, Reducing Toxicity, and Protecting Ecological Environment

Performance matching between the surface structure of cucumber powdery mildew in different growth stages and the properties of surfactant solution

Optimization of aviation adjuvants based on wettability analysis for insecticide application on maize using UAV

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