Patent EA-000303-B1 (EA)
Title: Method of reducing phytotoxicity of dicamba to crop plants, method of selectively controlling unwanted plant growth and herbicidal compositions thereof
Inventor: CHOLIET REYNOLD
IPC: A01N47/34
Filed: 1997-03-11
Abstract: 1. A method for reducing phytotoxicity of Dicamba to crop plants, which comprises co-applying to the crop plants or to the locus thereof a phytotoxicity reducing effective amount of a quinolinyloxy alkanoic acid derivative together with a herbicidally effective amount of Dicamba of formula I   and salt forms thereof. 2. A method of selectively controlling unwanted plant growth in monocotyledoneous crops which comprises co-application to the locus of said unwanted plant growth an herbicidally effective amount of Dicamba and a phytotoxicity reducing effective amount of a quinolinyloxy alkanoic acid derivative. 3. A method according to Claim 1 or 2 wherein the quinolinyloxy alkanoic acid derivative is selected from the compounds of formula II   wherein R1 is hydrogen or halogen, R2 is hydrogen or C1-4 alkyl, and R3 is C1-12 alkyl, C1-6alkoxy-C1-6 alkyl, C3-6 alkenyloxy-C1-6 alkyl, or C3-6alkinyloxy-C1-6alkyl. 4. A method according to any one of Claims 1 to 3 wherein the quinolinyloxy alkanoic acid derivative is Cloquintocet-mexyl. 5. A method according to any one of Claims 1 to 4 wherein Dicamba is applied in an amount from 50 to 2000 g/ha. 6. A method according to any one of Claims 1 to 5 wherein the quinolinyloxy alkanoic acid derivative is applied in an amount from 10 to 2000 g/ha. 7. A method according to any one of Claims 1 to 6 wherein additionally applied a compound of formula III   wherein M is hydrogen, or a salt forming moiety like an alkali metal cation or an optionally substituted ammonium, and X and Y represent independent hydrogen, fluorine or chlorine, 8. A method according to Claim 7, wherein the compound of formula III is Diflufenzopyr. 9. A herbicidal composition comprising a herbicidally effective aggregate amount of Dicamba and of phytotoxicity reducing effective amount of a quinolinyloxy alkanoic acid derivative. 10. A herbicidal composition according to Claim 9 wherein the quinolinyloxy alkanoic acid derivative is selected from the compounds of formula II   wherein R1 is hydrogen or halogen, R2 is hydrogen or C1-4 alkyl, and R3 is C1-12 alkyl, C1-6alkoxy-C1-6 alkyl, C3-6 alkenyloxy-C1-6 alkyl, or C3-6alkinyloxy-C1-6alkyl. 11. A herbicidal composition according to Claim 9 or 10 wherein the quinolinyloxy alkanoic acid derivative is Cloquintocet-mexyl. 12. A herbicidal composition according to any one of Claims 9 to 11 wherein the ratio of Dicamba to the quinolinyloxy alkanoic acid derivative is in the range of 1:40 to 200:1. 13. A herbicidal composition comprising a herbicidally effective aggregate amount of Dicamba and of a semicarbazone compound and of phytotoxicity reducing effective amount of a quinolinyloxy alkanoic acid derivative. 14. A herbicidal composition according to Claim 9 wherein the quinolinyloxy alkanoic acid derivative is selected from the compounds of formula II   wherein R1 is hydrogen or halogen, R2 is hydrogen or C1-4 alkyl, and R3 is C1-12 alkyl, C1-6alkoxy-C1-6 alkyl, C3-6 alkenyloxy-C1-6 alkyl, or C3-6alkinyloxy-C1-6alkyl. and semicarbazone compound is selected from the compounds of formula III.   wherein M is hydrogen, or a salt forming moiety like an alkali metal cation or an optionally substituted ammonium, and X and Y represent independent hydrogen, fluorine or chlorine. 15. A herbicidal composition according to Claim 13 or 14 wherein the quinolinyloxy alkanoic acid derivative is Cloquintocet-mexyl. 16. A herbicidal composition according to any one of Claims 13 to 15 wherein the semicarbazone compound is Diflufenzopyr. 17. A herbicidal composition according to any one of Claims 13 to 16 wherein the ratio of Dicamba to the quinolinyloxy alkanoic acid derivative is in the range of 1:40 to 200:1, and the ratio of Dicamba to the semicarbazone compounds is in the range of 1:100 to 1000:1. 18. A method according to any one of Claims 1 to 4, wherein the quinolinyloxy alkanoic acid derivative is applied as a seed dressing. 19. A method according to Claim 18, wherein the application rate of the quinolinyloxy alkanoic acid derivative is from 1.0 to 1000 g per 100 kg of seeds.