Rate Consult label.
Time Apply as a single application or split applications according to one of six alternative methods listed on label.
Remarks Yearly applications or use of other herbicides can reduce populations if a few plants survive growing season.
Caution A restricted-use herbicide. Consult label for planting sensitive crops within 12 to 24 months, depending on time of application and total amount applied.
Site of action Group 5: photosystem II inhibitor
Chemical family Triazine
Rate 0.75 to 1 lb ai/a
Time Apply when yellow nutsedge is 6 to 8 inches tall and, if needed, again at the same rate 7 to 10 days later.
Remarks Results are best with two applications. Add oil concentrate to spray mix as label instructs. Refer to this product in Postemergence section above for additional remarks and cautions.
Site of action Group 6: photosystem II inhibitor
Chemical family Benzothiadiazole
Rate 0.03 to 0.047 lb ai/a (0.66 to 1 oz/a Sandea)
Time Apply to yellow nutsedge that is at 3- to 5-leaf stage and to corn from spike through layby stage.
Remarks Controls nutsedge if applied when nutsedge is in 3- to 5-leaf stage. May need sequential applications with high densities of nutsedge. Apply up to two times during growing season. Always add a nonionic surfactant if not tank mixed with other herbicides. Use drop nozzles to reduce potential injury to corn, especially with sequential applications. Add 1 to 2 quarts nonionic surfactant or crop oil concentrate per 100 gal spray solution for broadcast applications. A second application may be required 6 to 10 weeks after the first.
Caution Not all varieties have been tested for sensitivity to halosulfuron. Not recommended on variety Jubilee.
Rate 0.078 to 0.094 lb ai/a (2.5 to 3 fl oz/a Callisto)
Time Apply postemergence to corn less than 5 inches tall.
Remarks Suppresses nutsedge growth.
S-metolachlor (Dual II Magnum and other names)
See "Corn-Preemergence, Soil-applied" in this section of this handbook. (Applications inhibit new tuber formation and reduce infestations).