SYMPOSIA PAPER Published: 01 January 1993

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


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).

Author Information

Keeney, FN
Noveroske, RL
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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