Aquatic Plant Control Research Program. Evaluation of 2,4-D/Adjuvant Mixtures in Flowing Water

摘要

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 (Myriophyllum 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. At flow velocities within plant stands of < or = 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 (< or = 3 cm/sec) to control Eurasian watermilfoil.