Interactions between imazamox and diphenylethers

A plant response study was conducted in the greenhouse to evaluate interact ions between imazamox and acifluorfen, fomesafen, or lactofen. Antagonistic interactions between imazamox and acifluorfen or fomesafen affected contro l of I, hederacea and A theophrasti 21 d after treatment. Combinations of i mazamox plus lactofen also antagonized control of I. hederacea. I. hederace a absorbed less C-14-imazamox when applied with nonlabeled acifluorfen, but absorption by A theophrasti was not affected by the combination. Addition of nonlabeled lactofen did not affect absorption of imazamox in A theophras ti or I, hederacea. Addition of acifluorfen or lactofen reduced translocati on of C-14-imazamox to foliage above and below the treated leaf and the roo t in both A. theophrasti and I. hederacea. Antagonism of A. theophrasti con trol was due to reduced translocation of imazamox. Antagonism of I. hederac ea control was due to reduced translocation of imazamox when applied with l actofen or reduced absorption and translocation when applied with acifluorf en.