Interactions between imazamox and diphenylethers

A plant response study was conducted in the greenhouse to evaluate interactions between imazamox and acifluorfen, fomesafen, or lactofen. Antagonistic interactions between imazamox and acifluorfen or fomesafen affected control ofI. hederaceaandA. theophrasti21 d after treatment. Combinations of imazamox plus lactofen also antagonized control ofI. hederacea. I. hederaceaabsorbed less14C-imazamox when applied with nonlabeled acifluorfen, but absorption byA. theophrastiwas not affected by the combination. Addition of nonlabeled lactofen did not affect absorption of imazamox inA. theophrastiorI. hederacea.Addition of acifluorfen or lactofen reduced translocation of14C-imazamox to foliage above and below the treated leaf and the root in bothA. theophrastiandI. hederacea.Antagonism ofA. theophrasticontrol was due to reduced translocation of imazamox. Antagonism ofI. hederaceacontrol was due to reduced translocation of imazamox when applied with lactofen or reduced absorption and translocation when applied with acifluorfen.