Dispersible herbicidal compositions and methods of use
Herbicidal dispersible concentrates include an herbicide and substantially water miscible amide-based solvents. Such concentrates may be diluted in water and used in methods to control weeds.
1. A formulation comprising:
a dispersible concentrate and water, the dispersible concentrate comprising:
about 10% to about 20% by weight of the concentrate of topramezone; and
about 0.6% to about 90% by weight of the concentrate of N-methyl pyrrolidone;
wherein topramezone is the only active ingredient of the dispersible concentrate;
wherein a ratio of dispersible concentrate to water is in a range from about 1:50 to 1:25,000 by volume, and wherein the formulation is in the form of a colloidal suspension.
2. The formulation of claim 1 , further comprising an additive selected from the group consisting of a surfactant, urea-ammonium nitrate (UAN), and combinations thereof.
3. The formulation of claim 1 , wherein a pH of the formulation is in a range from about 5 to about 10.
4. The formulation of claim 3 , wherein the pH is in a range from about 6.5 to about 7.5.
5. The formulation of claim 1 , wherein the dispersible concentrate further comprises an organic co-solvent selected from the group consisting of ethyl lactate, ethyl hexyl lactate, fatty acid dimethylamide, N,N-dimethyloctanamide, and N,N-dimethyldecanamide.
6. The formulation of claim 1 , wherein the dispersible concentrate further comprises a surfactant selected from the group consisting of a butyl polyalkylene oxide block copolymers, polyalkylene oxide block copolymers, tristyrylphenol ethoxylates, alkylphenol ethoxylates, castor oil ethoxylates, acetylenic polydiols, organosilicones, or mixtures thereof.
7. A method of making a colloidal suspension of topramezone comprising:
diluting a dispersible concentrate of topramezone with water, the dispersible concentrate comprising:
about 10% to about 20% by weight of the concentrate of topramezone; and
about 0.6% to about 90% by weight of the concentrate of N-methyl pyrrolidone;
wherein topramezone is the only active ingredient of the dispersible concentrate;
wherein a ratio of dispersible concentrate to water is in a range from about 1:50 to 1:25,000 by volume.