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In a previous study, the effect of specific dearomatized hydrocarbon fluids with boiling ranges between 220 and 310 °C was highlighted. In combination with surfactants, they were shown to increase significantly the performance of active ingredients (insecticides and herbicides) when incorporated in pesticide formulations or in tank mixes. These fluids were shown not only to improve the biological activity of the active ingredients but also to modify the application properties, volatility versus penetration characteristics and the mode of action.
This paper represents an extention of that prior work and focuses on the contribution of a specific dearomatized tailor made fluid boiling in the 240 – 260 °C range to the efficacy enhancement of two widely used herbicides, acetochlor and acifluorfen. Acetochlor, a selective pre-emergent herbicide used to control annual grasses in maize, was formulated into capsule suspension (CS), microcapsule and emulsifiable concentrate (EC) formulations. Acifluorfen, a post-emergent herbicide used to control annual broad leafed weeds in soybeans, was formulated into microemulsions (μE) and soluble concentrate (SL) formulations.
It will be demonstrated that capsule suspension and microemulsion formulations of these two active ingredients incorporating a tailor made hydrocarbon fluid provide improved or similar weed control with reduced phytotoxicity.
hydrocarbon, solvents, fluids, microencapsulation, microemulsion, capsule suspension, acetochlor, acifluorfen
Senior Staff Chemist, Exxon Chemical Company, Baytown,
Research Associate, Exxon Chemical Europe, Inc., Machelen,