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

[en] 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. © 2020 Society of Chemical Industry

Research Center/Unit :

Queensland University of Technology, Syngenta International, Syngenta

Disciplines :

Agriculture & agronomy

Author, co-author :

Huet, O. D. Y.; School of Mathematical Sciences, Queensland University of Technology, Brisbane, Australia

Massinon, M.; TERRA Research and Teaching Centre, Gembloux Agro Bio-Tech, University of Liège, Gembloux, Belgium, Redebel Regulatory Affairs, Saint-Amand, Belgium

De Cock, Nicolas ; Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges

Forster, W. A.; Plant Protection Chemistry NZ Ltd, Rotorua, New Zealand

Zabkiewicz, J. A.; SciCon Scientific Consultants Ltd, Rotorua, New Zealand

Pethiyagoda, R.; School of Mathematical Sciences, Queensland University of Technology, Brisbane, Australia

Moroney, T. J.; School of Mathematical Sciences, Queensland University of Technology, Brisbane, Australia

Lebeau, Frédéric ; Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges

McCue, S. W.; School of Mathematical Sciences, Queensland University of Technology, Brisbane, Australia

Language :

English

Title :

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

Publication date :

20 February 2020

Journal title :

Pest Management Science

ISSN :

1526-498X

eISSN :

1526-4998

Publisher :

John Wiley and Sons Ltd

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

Mathematical and computational models for agrichemical retention on plants; ARC Linkage Project LP160100707

Funders :

QUT - Queensland University of Technology

Available on ORBi :

since 08 July 2020

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