SEDL / STP / STP1146-EB / STP20204S

The Influence of Paraffinic Oil and Nonionic Surfactant on the Foliar Activity of an Aryloxyphenoxypropionate Herbicide

Keeney, FN
Senior Research Scientists, the North America Formulation Science and Technology Laboratory at DowElanco, IndianapolisMidland, IndianaMichigan

Noveroske, RL
Senior Research Scientists, the North America Formulation Science and Technology Laboratory at DowElanco, IndianapolisMidland, IndianaMichigan

Pages: 23    Published: Jan 1993

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Abstract

Formulation design criteria used in the development of emulsifiable concentrate compositions containing built-in adjuvants for XRD-492-methyl are discussed. Foliar applications of radiolabelled XRD-492-methyl were made on Setaria faberi (giant foxtail) and Avena fauta (wild oats) to characterize foliar retention, uptake, and basipetal transport of ¹⁴C-activity. On the basis of ¹⁴C-activity basipetal (downward) transport data, POLYGLYCOL 26-2 was the most effective nonionic surfactant studied and in combination with paraffinic oil, a weight ratio of 2:1 paraffinic oil: POLYGLYCOL 26-2 appeared near optimum. A total adjuvant concentration in the final composition of 60 wt % in conjunction with an active ingredient concentration of 30–120 g ae/ha provided a minimum adjuvant concentration in 187 L/ha total spray volume of 0.2% (w/v) paraffinie oil and 0.1% (w/v) nonionic surfactant when the use rate (g ae/ha) was the same as the active ingredient concentration (g ae/L).