Preharvest Treatment

2,4-D (various trade names)

Rate 0.5 lb ae/a

Time Apply when grain is in the dough stage.

Remarks To control weeds that will interfere with harvest or to suppress perennial weeds.

Caution Do not apply to fields underseeded to legumes. Do not graze treated grain field within 14 days after treatment.

Site of action Group 4: synthetic auxin

Chemical family Phenoxy acetic acid

carfentrazone (Aim EC)

Rate 0.016 to 0.031 lb ai/a (1 to 2 oz/a Aim EC)

Time Apply when crop is mature and the grain has begun to dry down.

Remarks A nonionic surfactant (NIS), methylated seed oil (MSO), or crop oil concentrate (COC) is required. Thorough coverage is essential for satisfactory performance. Re-treat if necessary.

Caution If applied as a tank-mixture, refer to the other product's label for restrictions on tank mixing, and observe all label precautions, instructions, and rotational cropping restrictions.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family Triazolinone

dicamba + 2,4-D (Weedmaster and other trade names)

Rate 0.25 lb ae/a dicamba + 0.5 to 1 lb ae/a 2,4-D

Time Apply when grain is in hard dough stage and no green remains in stem nodes.

Remarks To control weeds that will interfere with harvest, or to suppress perennial weeds.

Caution Do not apply to fields underseeded to legumes. Preharvest interval is 2 weeks.

Site of action Group 4: synthetic auxin

Chemical family (dicamba) Benzoic acid; (2,4-D) Phenoxy acetic acid

glyphosate (various trade names)

Rate 0.38 to 0.75 lb ae/a (1 to 2 pints/a of a 3 lb ae/gal formulated herbicide)

Time Apply after wheat reaches hard dough stage and grain moisture is less than 30%. Apply at least 7 days before harvest.

Remarks To control annual and perennial weeds. Add 0.5% to 1% nonionic surfactant. Apply 3 to 10 gal/a by air or 10 to 20 gal/a by ground.

Caution Do not apply to wheat grown for seed.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted

saflufenacil (Sharpen)

Rate 0.022 to 0.045 lb ai/a (1 to 2 oz/a Sharpen)

Time Apply only to barley, wheat, and triticale that have reached physiological maturity (hard-dough stage; grain contains less than 30% moisture), or according to Extension Service recommendations in the use area. Allow 7 days for optimum desiccation effect depending on environmental conditions.

Remarks A methylated seed oil plus ammonium-based adjuvant system is required for optimum desiccation activity and weed control. See label for more information on adjuvants and tank-mixes.

Caution Do not apply more than a maximum cumulative amount of 2.0 oz/a of Sharpen per cropping season for desiccation purposes. Do not apply Sharpen on barley (all types), wheat (all types), or triticale grown for seed production.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family Pyrimidinedione