US 12,108,760 B2
Herbicidal compositions
Ashoke K. SenGupta, Wentzville, MO (US); Thimmareddy Thatiparti, Chesterfield, MO (US); and Junhua Zhang, Chesterfield, MO (US)
Assigned to MONSANTO TECHNOLOGY LLC, Saint Louis, MO (US)
Appl. No. 16/962,895
Filed by Monsanto Technology LLC, St. Louis, MO (US)
PCT Filed Dec. 28, 2018, PCT No. PCT/US2018/067802
§ 371(c)(1), (2) Date Jul. 17, 2020,
PCT Pub. No. WO2019/143455, PCT Pub. Date Jul. 25, 2019.
Claims priority of provisional application 62/618,485, filed on Jan. 17, 2018.
Prior Publication US 2021/0059248 A1, Mar. 4, 2021
Int. Cl. A01N 25/28 (2006.01); A01N 25/30 (2006.01); A01N 25/32 (2006.01); A01N 37/26 (2006.01); A01N 37/40 (2006.01)
CPC A01N 25/28 (2013.01) [A01N 25/30 (2013.01); A01N 25/32 (2013.01); A01N 37/26 (2013.01); A01N 37/40 (2013.01)] 19 Claims
 
1. An aqueous herbicidal concentrate composition comprising:
(a) microcapsules dispersed in an aqueous liquid medium wherein the microcapsules comprise a core material comprising an acetamide herbicide and a polyurea shell wall encapsulating the core material, wherein the acetamide herbicide concentration in the composition on an active ingredient basis is at least about 10 wt. %, and
(b) an auxin herbicide component comprising an anion of an auxin herbicide and a salt-forming cation, wherein the auxin herbicide concentration in the composition on an acid equivalent basis is at least about 1 wt. %, and wherein the composition satisfies the following conditions:
(i) a pH that is no greater than about 3.8;
(ii) a molar ratio of the salt-forming cation to the anion of the auxin herbicide that is no greater than about 0.8:1; and
(iii) the composition further comprises an emulsifier comprising an anionic surfactant comprising a strong or mineral acid functionality having a molecular weight of at least about 1,000 Da, wherein the anionic surfactant comprising a strong or mineral acid functionality has a pKa of less than about 4.5; and one or more of the following conditions:
(iv) the composition further comprises ferric sulfate; and/or
(v) the composition further comprises an alkylene glycol.
 
19. A method for controlling weeds in a field, the method comprising:
mixing water with the aqueous herbicidal concentrate composition of claim 1 to form an application mixture; and
applying the application mixture to the field in a herbicidally effective amount.