Co-application of auxin agonist herbicides such as dicamba and amino acid synthesis inhibitor herbicides such as ALS inhibitor herbicides reduces the incidence of phytotoxic effects, particularly in grassy crops.

Co-application of auxin agonist herbicides such as dicamba and amino acid synthesis inhibitor herbicides such as ALS inhibitor herbicides reduces the incidence of phytotoxic effects, particularly in grassy crops.

The present invention provides a method for synergistic broad spectrum weed control which comprises applying to the weeds or their locus a synergistically effective amount of a combination of an imidazolinone herbicide plus (4-chloro-2-methylphenoxy)acetic acid (MCPA). Further provided are synergistic herbicidal compositions comprising an imidazolinone herbicide plus MCPA.

Herbicidal compositions containing a combination (A)+(B)+(C) of (A) leaf-acting herbicides from the group glufosinate and its esters and salts, glufosinate-peptides, such as bialaphos, and its salts, glyphosate and its salts, for example also sulfosate, (B) imidazolinone herbicides and their salts and (C) one or more active compounds from the group of the growth-promoting herbicides and their esters and salts have synergistic herbicidal action.

There is provided a method to overcome or decrease the antagonistic interaction caused by the application of an acetohydroxyacid synthase-inhibiting herbicide in combination with a non-acetohydroxyacid synthase-inhibiting herbicide such as dicamba, 2,4-D, bromoxynil, atrazine or bentazone, which comprises applying an effective amount of imazapyr (2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)nicotinic acid).