carfentrazone (Aim and other trade names)
Rate Up to 0.031 lb ai/a (2.0 oz/a Aim EC)
Time Preplant burndown.
Remarks Apply to weeds up to 4 inches. Broad-spectrum weed control requires use of a labeled tank mix partner (i.e. glyphosate).
Caution Apply carfentrazone no less than one day before planting. Do not exceed 0.096 lb ai/a per season.
Site of action Group 14: protoporphyrinogen oxidase (PPO) inhibitor
Chemical family Triazolinone
glyphosate (several trade names)
Rate 0.375 to 3.75 lb ae/a
Time Apply preplant, at planting or before crop emergence.
Remarks Not all glyphosate labels include preplant, at planting or preemergence uses. Rate is determined by weed species and size; see label for specific instructions.
Caution Do not apply to emerged flax. Do not exceed season maximum of 6.0 lb ae/a.
Site of action Group 9: inhibits EPSP synthase
Chemical family None generally accepted
Rate 0.188 lb ai/a (6 oz/a Callisto)
Time Apply before crop emergence.
Remarks For emerged weeds, see label for adjuvant recommendation.
Caution Do not exceed 0.188 lb ai/a (6 oz/a product) per season. See label for crop rotation restrictions. Do not apply to emerged flax.
Site of action Group 28: inhibits 4-hydroxyphenylpyruvatedioxygenase (4-HPPD)
Chemical family Triketone
sulfentrazone (Spartan 4F and other trade names)
Rate 0.094 lb ai/a to 0.25 lb ai/a (3.0 to 8.0 oz/a Spartan 4F)
Time Preplant incorporated or preemergence.
Remarks Efficacy may be reduced if 0.5 to 1 inch of rain or irrigation is not received or incorporated within 7 to 10 days. Do not incorporate deeper than 2 inches. Maximum use rate varies by soil type, pH and organic matter. See label for details.
Caution Do not apply if seedlings are close to the surface. Plant at least 1 inch deep and ensure good furrow closure. Other situations may cause injury. See label for details. Do not apply more than 0.375 lb ai/a per 12-month period.
Site of action Group 14: protoporphyrinogen oxidase inhibitor
Chemical family Triazinone
trifluralin (several trade names)
Rate 0.5 to 1 lb ai/a
Time Apply preplant and incorporate into soil.
Remarks Use either liquid or granular formulation. Proper soil preparation and incorporation of trifluralin are critical for best results. Trifluralin is weak on members of the mustard and sunflower families, and on volunteer cereals.
Caution Incorporate within 24 hours of application. See label for crop rotation restrictions. Trifluralin may only be applied in the fall prior to spring-planted flax. See label for special flax instructions.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline