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.