Effect of adjuvants on physical properties of glyphosate and PPO-inhibiting herbicide spray mixtures

Jesaelen G. Moraes, Joe D. Luck, Ulisses R. Antuniassi, Wesley Clint Hoffmann, Greg R. Kruger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Adjuvants are known to enhance spray droplet retention on leaf surfaces and penetration of herbicide active ingredients through cuticles due to changes in physical properties such as density, viscosity, surface tension (SFT), and contact angle (CA) increasing leaf wettability. However, previous research has shown that the performance of an adjuvant is dependent on the herbicide with which it is applied, the plant species, and environmental conditions. The objectives of this study were to determine the effect of adjuvants on these physical properties when glyphosate and lactofen are applied alone and in combination and to determine if these changes can be correlated to herbicide efficacy. The impact of the addition of the adjuvants into the treatment solutions was greater on viscosity than on density values. Overall, adjuvants significantly decreased the SFT of treatment solutions when compared to either water or herbicides alone. In addition, reduced CA was observed due to the reduction in surface tension. However, results were adjuvant- and species-dependent. Herbicide efficacy was only partially explained by the changes in these physical properties. Observations from this study highlighted the importance of adjuvants on reducing SFT and CA properties of spray solutions; however, further investigation is needed to better understand the factors influencing herbicide uptake and how they are correlated in order to maximize herbicide efficacy.

Original languageEnglish (US)
Title of host publicationPesticide Formulation and Delivery Systems
Subtitle of host publication39th Volume, Innovation Formulation, Application and Adjuvant Technologies for Agriculture
EditorsDouglas J. Linscott
PublisherASTM International
Pages64-74
Number of pages11
ISBN (Electronic)9780803176843
DOIs
StatePublished - 2019
Event39th Symposium on Pesticide Formulation and Delivery Systems: Innovation Formulation, Application and Adjuvant Technologies for Agriculture - Washington, United States
Duration: Oct 23 2018Oct 25 2018

Publication series

NameASTM Special Technical Publication
VolumeSTP 1619
ISSN (Print)0066-0558

Conference

Conference39th Symposium on Pesticide Formulation and Delivery Systems: Innovation Formulation, Application and Adjuvant Technologies for Agriculture
Country/TerritoryUnited States
CityWashington
Period10/23/1810/25/18

Keywords

  • Contact angle
  • Density
  • Herbicide efficacy
  • Surface tension
  • Viscosity
  • Weed control

ASJC Scopus subject areas

  • Materials Science(all)

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