Herbicidal compositions

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.