ABSTRACT
The operations and maintenance project for the removal of water hyacinth and alligator weed in Louisiana has been in existence for many years, and the application of 2,4-dichlorophenoxy-acetic acid (2,4-D) has evolved as the most effective means of control. The Corps of Engineers in 1966 began seeking to have 2,4-D dimethylamine registered for use on water hyacinth, including use in slowly moving water. Time course study was conducted in a canal system owned and operated by the Southdown Corporation of Louisiana. This particular canal system was chosen because it provided a main canal which served as a common water source for the six lateral canals used an individual test location. The main canal originated at Milton, Louisiana, and its water source was the Vermilion River. The city of Punta Gorda, Florida constructed a small water supply reservoir in 1964, impounding the waters of Shell Creek and Prairie Creek near that city.
