Systemic herbicides and methods of use

• US 4,994,101 A
• Filed: 11/03/1987
• Issued: 02/19/1991
• Est. Priority Date: 11/17/1982
• Status: Expired due to Term

• Current Assignee: Entek Corporation
• Original Assignee: Union Oil Company of California (Chevron Corp.)
• Inventors: Young, Donald C.
• Primary Examiner(s): Hollrah, Glennon H.
• Assistant Examiner(s): Burn, Brian M.
• Application Number:
  US07/116,472
• Time in Patent Office: 1,204 Days
• Field of Search: 71/86, 71/79, 71/83
• US Class Current: 504/127
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 37/18 containing the group —CO—N<, e.g. carboxylic acid amides or imides; Thio analogues thereof
• CPC Class Codes: A01N 47/28 Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< isoureas, isothioureas A01N47/42
• CPC Class Codes: A01N 47/34 containing the groups , e.g. biuret; Thio analogues thereof; Urea-aldehyde condensation products
• CPC Class Codes: A01N 59/02 Sulfur; Selenium; Tellurium; Compounds thereof
• CPC Class Codes: A01N 61/00 Biocides, pest repellants or attractants, or plant growth regulators containing substances of unknown or undetermined composition, e.g. substances characterised only by the mode of action

Abstract

Herbicidal compositions having systemic herbicidal activity comprise solutions containing one or more systemic herbicides and an amount of an amide and sulfuric acid of the following formula sufficient to accentuate the activity of the systemic herbicide: ##STR1## wherein X is a chalcogen, and each of R₁, R₂ and R₃ is independently selected from hydrogen and organic radicals. As used herein, "amide" encompasses all compounds of formula (1) regardless of the chalcogen employed. The molar ratio of amide to sulfuric acid is usually within the range of about 1/4 to less than 2 so that at least some of the sulfuric acid is present as the monoamide-sulfuric acid adduct. The monoamide adduct also acts as a contact herbicide and thereby assists in the immediate control of treated vegetation. Solid compositions comprising combinations of systemic herbicides, sulfuric acid and the useful amides, with and without surfactants, and methods of using the solutions are also disclosed.

Claims

1. A herbicidal composition comprising a systemic herbicide stable in said composition and the monoadduct of urea and sulfuric acid.

2. The composition defined in claim 1 further comprising a surfactant.

3. The composition defined in claim 1, wherein said monoadduct constitutes at least about 1 weight percent of said composition expressed as the combined weight of said urea and sulfuric acid.

4. The composition defined in claim 1 wherein said systemic herbicide comprises a postemergent systemic herbicide.

5. The composition defined in claim 1 comprising a solid combination of said adduct and systemic herbicide, in which composition said urea and sulfuric acid, in combination, constitute at least about 50 weight percent of said composition, and said systemic herbicide constitutes at least about 0.1 weight percent of said composition.

6. The composition defined in claim 1 free of unadducted sulfuric acid.

7. The composition defined in claim 1 comprising an aqueous solution of said adduct, and systemic herbicide.

8. The composition defined in claim 1 comprising an aqueous solution of said adduct, systemic herbicide, and a surfactant, wherein the molar ratio of said urea to said sulfuric acid is at least about 1/1 , and said adduct is present in an amount sufficient to enhance the activity of said systemic herbicide.

9. The composition defined in claim 1 which is free of decomposition products of said urea or sulfuric acid.

10. The composition defined in claim 1 free of unadducted sulfuric acid and comprising an amount of said adduct sufficient to enhance the activity of said systemic herbicide.

11. A herbicidal composition comprising a systemic herbicide stable in said composition and the and at least about 50 percent of said sulfuric acid is present as said monoadduct.

12. A herbicidal composition comprising at least a herbicidally effective amount of a combination of a postemergent systemic herbicide stable in said composition, a surfactant, and the monoadduct of urea and sulfuric acid.

13. A herbicidal composition comprising a systemic herbicide stable in said composition and the monoadduct of urea and sulfuric acid wherein said adduct is present in an amount sufficient to enhance the activity of said systemic herbicide.

14. A method for controlling vegetation which comprises contacting said vegetation with a herbicidally effective amount of a composition defined in any one of 1-12 claims.

15. A method for controlling vegetation which comprises contacting said vegetation with (a) a systemic herbicide stable in said composition and (b) a urea and sulfuric acid.