Effects of water and copper complexes in combination with Reward~(R) herbicide

摘要

An array of various copper algaecides and herbicides have been developed and are now marketed by several manufacturers for the aquatic vegetation control market. Reward~(R) Landscape and Aquatic Herbicide (diquat dibromide) manufactured by SyngentaCrop Protection, Inc. (formerly Zeneca Ag Products), is often used in combination with a copperbased material to enhance algal or herbicidal activity against specific aquatic nuisance plant species. For subsurface applications, aquatic plant managers mayutilize little water as a diluent with Reward to maximize the range of area that can be treated from one tank before re-filling. Isolated instances of chemical incompatibilities between Reward and some common aquatic copper herbicides have been reported. Syngenta conducted a compatibility trial evaluating Reward along with an updated formulation of Reward (termed Reward QIT = Reward Quality Improved Technology in this paper). The purpose of this study was to determine the compatibility of Reward concentrates in combination with eight different copper materials and compatibility in distilled water, hard water, alkaline and acidic water to indicate any compatibility problems. Results of this trial indicate all Reward and copper herbicides tested to be compatible in the various water types. Precipitate development in some concentrate mixtures without water demonstrate the importance of dilution of concentrates with water.