Evaluation of flumioxazin and other herbicides for weed control in gladiolus.
Two studies were conducted near Bronson, Michigan, USA, to determine gladiolus (Gladiolus sp.) tolerance and weed control with flumioxazin and other herbicide treatments. The first study was conducted in 2002, 2003 and 2004 to evaluate weed control and gladiolus injury with flumioxazin and 14 other pre-emergence treatments. Crop injury over the 3-year period was less than 6% and was considered commercially acceptable with flumioxazin, linuron, oryzalin, pendimethalin, prometryn, S-metolachlor and sulfentrazone. Gladiolus stand count, height, and flower count were similar to those of the nontreated control with these treatments. Clomazone, halosulfuron, imazamox, imazapic, mesotrione, oxyfluorfen, rimsulfuron, and trifloxysulfuron resulted in unacceptable crop injury. Of the acceptable treatments, only flumioxazin controlled (at least 68%) common ragweed (Ambrosia artemisiifolia), yellow nutsedge (Cyperus esculentus) and foxtail species (Setaria faberi and S. viridis var. robusta-purpurea). The second study was conducted in 2003 and 2004. Flumioxazin was evaluated at 4 rates, in mixtures with S-metolachlor and oryzalin, and in comparison with isoxaben plus oryzalin. Gladiolus injury did not exceed 6%. Common ragweed, annual grass (Digitaria sanguinalis and Eragrostis cilianensis), and yellow nutsedge control were at least 63% with all flumioxazin treatments.