SYMPOSIA PAPER Published: 01 January 1992

Relationship Between Surfactant Characteristics and the Phytotoxicity of CGA-136872


Research was conducted to determine the relationship between the phytotoxicity of CGA-136872 and the chemical and physical properties of surfactants. All surfactants tested greatly enhanced CGA-136872 phytotoxicity to quackgrass. Surfactant enhancement of CGA-136872 phytotoxicity increased, peaked, and decreased as surfactant hydrophilic:lipophilic balance (HLB) increased. The peak or optimum HLB ranged from 11.9 to 14.3. Surfactants that differed in chemistry but had an HLB in the optimum range differed in their enhancement of CGA-136872 phytotoxicity to quackgrass. Surfactant characteristics that promoted quackgrass control with CGA-136872 were low molecular weight, low surface tension, low cloud point temperature, low pour point temperature, and HLB between 11.9 and 14.3.

Author Information

Manthey, FA
Horsley, RD
Nalewaja, JD
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Developed by Committee: E35
Pages: 258–270
DOI: 10.1520/STP16886S
ISBN-EB: 978-0-8031-5181-9
ISBN-13: 978-0-8031-1414-2