Compositions comprising pyridine carboxylate herbicides with photosystem II and optional HPPD inhibitor herbicides

A method of controlling undesirable vegetation, comprising applying to the vegetation or an area adjacent the vegetation or applying to soil or water to limit the emergence or growth of the vegetation a composition, comprising:

• (a) a pyridine carboxylate herbicide defined by Formula (I):
• wherein
• R1 is cyanomethyl or propargyl;
• R2 and R2′ are independently hydrogen, C1-C6 alkyl, formyl, alkoxycarbonyl, or acyl;
• R3, R3′, R3″, and R3″ are independently hydrogen, halogen, C1-C4 alkyl, C1-C4 haloalkyl, C1-C3 alkoxy, or C1-C3 haloalkoxy;
• or an agriculturally acceptable salt thereof;
• and
• (b) a PS II inhibitor herbicide or an agriculturally acceptable salt or ester thereof;
• wherein the pyridine carboxylate herbicide is applied in an amount of at least 0.1 g ae/ha;
• wherein the PS II inhibitor herbicide is applied in an amount of at least 5 g ai/ha;
• wherein the weight ratio of the pyridine carboxylate herbicide to the PS II inhibitor herbicide is from about 1:500 to about 10:1;
• and
• wherein the composition induces an unexpectedly enhanced herbicidal effect.