SYMPOSIA PAPER Published: 01 January 1993
STP20204S

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

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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).

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Developed by Committee: E35
Pages: 340–362
DOI: 10.1520/STP20204S
ISBN-EB: 978-0-8031-5221-2
ISBN-13: 978-0-8031-1439-5