Two studies were conducted near Bronson, MI, to determine gladiolus 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 preemergence treatments. Crop injury over the 3-yr 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 common ragweed, yellow nutsedge, and foxtail species at least 68%. The second study was conducted in 2003 and 2004. Flumioxazin was evaluated at four 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, and yellow nutsedge control were at least 63% with all flumioxazin treatments.
Nomenclature: Clomazone; flumioxazin; halosulfuron; imazamox; imazapic; isoxaben; linuron; mesotrione; oryzalin; oxyfluorfen; pendimethalin; prometryn; rimsulfuron; S-metolachlor; sulfentrazone; trifloxysulfuron; common ragweed, Ambrosia artemisiifolia L. #3 AMBEL; giant foxtail, Setaria faberi Herrm. # SETFA; large crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSA; purple robust foxtail, Setaria viridis var. robusta-purpurea Schr. # SETVI; stinkgrass, Eragrostis cilianensis (All.) E. Mosher # ERACN; yellow nutsedge, Cyperus esculentus L. # CYPES; gladiolus, Gladiolus spp.
Additional index words: Crop tolerance, floriculture, herbicide efficacy.
Abbreviation: WAT, weeks after treatment.