Mode of action of organosilicone surfactants in enhancing the performance of Triclopyr herbicide
type: CreativeWork
description: Triclopyr formulations in the presence or absence of added surfactants were evaluated in relation to optimum control of gorse (Ulex europaeus L.). From a wide range of non-ionic surfactants, superior formulations of triclopyr butoxyethyl ester were selected on the basis of radio labelled uptake and translocation studies. Five surfactants which significantly promoted uptake without major reductions in translocation of the triclopyr ester were identified; three organosilicone surfactants (Dow Corning 57, Dow Corning X25152 and Silwet L77), an N-alkyl pyrrolidone surfactant (Surfadone LP300) and an octylphenoxy surfactant (Triton X-45). The inherently difficult nature of gorse as an experimental plant was identified as potentially limiting for a number of detailed physiological investigations. A model plant system, field bean (Vicia/aba L. cv. Maris Bead), was selected which could reproduce the behaviour of gorse with several triclopyr fonnulations in addition to being readily established and fast growing. Scanning electron microscopy of the plant surfaces revealed some similarities in morphological characteristics between gorse and field bean, such as percentage of the plant surface covered in stomatal pores. Gorse had a stomatal pore percent cover of 1.2 % while the adaxial leaf surface of field bean had a value of 0.8 %. The majority of investigations were conducted with the three organosilicoI.1e surfactants (Dow Corning 57, Dow Corning X25152 and Silwet L77) and Surfadone LP300. In both gorse and field bean, uptake of ¹⁴C-triclopyr butoxyethyl ester was increased as surfactant rate was increased, up to an optimum (between 0.2 and 0.5 %v/v for all surfactants), above which uptake tended to decline or plateau, particularly for the three organosilicones. Translocation expressed as a percent of applied herbicide tended to increase as surfactant rate increased although this was not always significant and the highest rate (0.5 %v/v) sometimes caused a reduction. In cont…
abstract: Triclopyr formulations in the presence or absence of added surfactants were evaluated in relation to optimum control of gorse (Ulex europaeus L.). From a wide range of non-ionic surfactants, superior formulations of triclopyr butoxyethyl ester were selected on the basis of radio labelled uptake and translocation studies. Five surfactants which significantly promoted uptake without major reductions in translocation of the triclopyr ester were identified; three organosilicone surfactants (Dow Corning 57, Dow Corning X25152 and Silwet L77), an N-alkyl pyrrolidone surfactant (Surfadone LP300) and an octylphenoxy surfactant (Triton X-45). The inherently difficult nature of gorse as an experimental plant was identified as potentially limiting for a number of detailed physiological investigations. A model plant system, field bean (Vicia/aba L. cv. Maris Bead), was selected which could reproduce the behaviour of gorse with several triclopyr fonnulations in addition to being readily established and fast growing. Scanning electron microscopy of the plant surfaces revealed some similarities in morphological characteristics between gorse and field bean, such as percentage of the plant surface covered in stomatal pores. Gorse had a stomatal pore percent cover of 1.2 % while the adaxial leaf surface of field bean had a value of 0.8 %. The majority of investigations were conducted with the three organosilicoI.1e surfactants (Dow Corning 57, Dow Corning X25152 and Silwet L77) and Surfadone LP300. In both gorse and field bean, uptake of ¹⁴C-triclopyr butoxyethyl ester was increased as surfactant rate was increased, up to an optimum (between 0.2 and 0.5 %v/v for all surfactants), above which uptake tended to decline or plateau, particularly for the three organosilicones. Translocation expressed as a percent of applied herbicide tended to increase as surfactant rate increased although this was not always significant and the highest rate (0.5 %v/v) sometimes caused a reduction. In cont…
author: Buick, Rosalind D.
language: en
keywords: surfactant, organosilicone, Silwet L77, stomata, gorse, field beans, triclopyr, herbicides, uptake mechanisms, ANZSRC::070308 Crop and Pasture Protection (Pests, Diseases and Weeds), ANZSRC::079902 Fertilisers and Agrochemicals (incl. Application)
license: https://researcharchive.lincoln.ac.nz/pages/rights
date published: 1990
date modified: 2026-07-24T02:50:30Z
provider: Lincoln University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Lincoln University

PropertyValue
property ID: Handle
value: https://hdl.handle.net/10182/1909