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Title: Evaluation of 2,4-D/adjuvant mixtures in flowing water
Authors: Getsinger, Kurt D.
Westerdahl, Howard E.
Keywords: Adjuvants
Flowing water
Aquatic plant control
Eurasian Watermilfoil
Myriophyllum spicatum
Aquatic Plant Control Research Program (U.S.)
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Miscellaneous Paper (Aquatic Plant Control Research Program (U.S.)) ; no.Miscellaneous Paper A-86-3
Abstract: Four 2,4-D DMA/adjuvant formulations (inverts Asgrow 403 and I'vod, and polymers Nalquatic and Poly Control) were evaluated for controlling Eurasian watermilfoil (Myriophyllwn spicatum) in flowing water. Flow velocities of 1.5 to 3.0 cm/sec were used to evaluate 2,4-D release profiles determined by measuring herbicide residues in water collected 175 cm downstream from the treatment area. Herbicide release profiles from 2,4-D/adjuvant formulations were compared with herbicide release profiles from conventional 2,4-D formulations (liquid 2,4-D DMA and granular 2,4-D BEE). All the 2,4-D DMA/adjuvant formulations released 2,4-D for longer periods than did the conventional 2,4-D DMA formulation at 1.5- and 3.0-cm/sec flow velocities. The invert I'vod released for longer periods (180 min) than did the invert Asgrow 403 (24 to 48 min), while the polymer Poly Control released for longer periods (72 to 180 min) than did the polymer Nalquatic (48 to 72 min). Only I'vod and Poly Control released 2,4-D for longer periods (180 min) than the conventional 2,4-D BEE formulation (156 min) at the 1.5-cm/sec flow velocity, and only I'vod released 2,4-D longer (180 min) than BEE (72 min) at the 3.0-cm/sec flow velocity. At flow velocities within plant stands of ≤3 cm/sec, the use of selected 2,4-D DMA/adjuvant formulations will provide longer herbicide release profiles compared with a conventional 2,4-D DMA formulation. The extended release profiles of I'vod and Poly Control make these adjuvants the most promising for use with 2,4-D DMA in flowing water (≤3 cm/sec) to control Eurasian watermilfoil.
Description: Miscellaneous Paper
Gov't Doc #: Miscellaneous Paper A-86-3
Rights: Approved for public release; distribution is unlimited
Appears in Collections:Miscellaneous Paper

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