AQUEOUS HERBICIDAL CONCENTRATES
Aqueous based pesticide compositions having a high concentration of a water-soluble salt of 2,4-dichlorophenoxyacetic acid (2,4-D) and a lower concentration of a water-insoluble herbicide (halauxifen-methyl and/or fluoroxypyr-meptyl) are provided herein. These compositions are, among other things, transparent, homogeneous, stable upon storage in various thermal environments, and upon dilution in water form a stable emulsion.
1 . A stable aqueous herbicidal composition comprising:
a. a water soluble salt of 2,4-D comprising, with respect to the total composition, from about 200 gram acid equivalent per liter (g ae/L) to about 550 g ae/L of 2,4-D;
b. a second herbicide comprising, with respect to the total composition, from about 0.1 g ae/L to about 20 g ae/L of halauxifen-methyl, from about 20 g ae/L to about 150 g ae/L of fluoroxypyr-meptyl, or a mixture thereof;
c. from about 0 g/L to about 150 g/L, with respect to the total composition, of at least one of an ionic and/or a non-ionic surfactant;
d. from about 10 g/L to about 500 g/L, with respect to the total composition, of an organic solvent; and
e. from about 200 g/L to about 800 g/L, with respect to the total composition, of water;
wherein the composition forms a stable, transparent, and homogenous herbicidal composition.
2 . The herbicidal composition of claim 1 , wherein the herbicidal composition shows no visible phase separation after storage at 54° C. for 2 weeks.
3 . The herbicidal composition of claim 1 , wherein the herbicidal composition shows no visible crystal formation at −10/40° C. freeze/thaw cycling conditions every 24 hours for 2 weeks.
4 . The herbicidal composition of claim 1 , wherein the water soluble salt of 2,4-D comprises one or more organo ammonium cations.
5 . The herbicidal composition of any of claim 1 , wherein the organo ammonium cations are dimethyl ammonium, diethyl ammonium, dimethylethanol ammonium, triethyl ammonium, diethanol ammonium, triethanol ammonium, triisopropanol ammonium, tetramethyl ammonium, choline, or mixtures thereof.
6 . The herbicidal composition of claim 1 , wherein the second herbicide is halauxifen-methyl and the weight ratio on an acid equivalent (ae) basis of the 2,4-D to halauxifen-methyl is from about 5500:1 to about 10:1.
7 . The herbicidal composition of claim 1 , wherein the second herbicide is fluoroxypyr-meptyl and the weight ratio on an ae basis of the 2,4-D to fluoroxypyr-meptyl is from about 30:1 to about 1:1.
8 . The herbicidal composition of claim 1 , wherein the second herbicide is a mixture of halauxifen-methyl and fluoroxypyr-meptyl.
9 . The herbicidal composition of claim 1 , further comprising an agriculturally acceptable adjuvant or carrier.
10 . A method of controlling undesirable vegetation comprising contacting the vegetation or an area adjacent thereto to prevent the emergence of growth of vegetation a herbicidally effective amount of a herbicidal composition comprising:
a. a water soluble salt of 2,4-D comprising, with respect to the total composition, from about 200 g ae/L to about 550 g ae/L of 2,4-D;
b. a second herbicide comprising, with respect to the total composition, from about 0.1 g ae/L to about 20 g ae/L of halauxifen-methyl, from about 20 g ae/L to about 150 g ae/L of fluoroxypyr-meptyl, or a mixture thereof;
c. from about 0 g/L to about 150 g/L, with respect to the total composition, of at least one of an ionic and/or a non-ionic surfactant;
d. from about 10 g/L to about 500 g/L, with respect to the total composition, of an organic solvent; and
e. an aqueous phase comprising, with respect to the total composition, from about 200 g/L to about 800 g/L of water;
wherein the composition forms a stable, transparent, and homogenous herbicidal composition.
11 . The method of claim 10 , wherein the herbicidal composition shows no visible phase separation after storage at 54° C. for 2 weeks.
12 . The method of claim 10 , wherein the herbicidal composition shows no visible crystal formation after storage at −10/40° C. freeze/thaw cycling conditions every 24 hours for 2 weeks.
13 . The method of claim 10 , wherein the water soluble salt of 2,4-D comprises one or more organo ammonium cations.
14 . The method of claim 10 , wherein the organo ammonium cations are dimethyl ammonium, diethyl ammonium, triethyl ammonium, dimethylethanol ammonium, diethanol ammonium, triethanol ammonium, triisopropanol ammonium, tetramethyl ammonium, choline, or mixtures thereof.
15 . The method of claim 10 , wherein the second herbicide is halauxifen-methyl and the weight ratio on an ae basis of the 2,4-D to halauxifen-methyl is from about 5500:1 to about 10:1.
16 . The method of claim 10 , wherein the second herbicide is fluoroxypyr-meptyl and the weight ratio on an ae basis of the 2,4-D to fluoroxypyr-meptyl is from about 30:1 to about 1:1.
17 . The method of claim 10 , wherein the second herbicide is a mixture of halauxifen-methyl and fluoroxypyr-meptyl.
18 . The method of claim 10 , further comprising an agriculturally acceptable adjuvant or carrier.
19 . The method of claim 10 , wherein the undesirable vegetation is controlled in a herbicide tolerant crop.
20 . The method of claim 19 , wherein the herbicide tolerant crop possesses single, multiple or stacked traits conferring tolerance to one or more herbicide chemistries and/or inhibitors with single or multiple modes of action.
21 . The method of claim 19 , wherein the undesirable vegetation comprises a herbicide resistant or tolerant weed.