flufenacet + metribuzin (Axiom DF)
Suppression only
Rate 0.136 to 0.34 lb/A flufenacet and 0.034 to 0.085 lb/A metribuzin (4 to 10 oz/A Axiom DF)
Time Apply from wheat germination to the two-leaf growth stage.
Remarks For best results: 1) plant wheat after the first flush of weeds has emerged and is destroyed by tillage; or, in no-till winter wheat, apply a nonselective herbicide to control emerged weeds at or before planting; 2) apply Axiom before the weeds' one-leaf stage; and 3) use the highest specified rate depending on soil texture. Less than 0.5 inch of rainfall or irrigation within two weeks following application may result in reduced weed control.
Caution Winter wheat must be planted at least 1.5 inches deep. Certain wheat varieties are sensitive to Axiom; see label. Do not exceed 10 oz/A Axiom DF per season.
Site of action (flufenacet) Group 15: very long chain fatty acid synthesis inhibitor; (metribuzin) Group 5: photosystem II inhibitor
Chemical family (flufenacet) Oxyacetamide; (metribuzin) Triazine
mesosulfuron (Osprey)
Suppression only
Rate 0.013 lb ai/A (4.75 oz/A Osprey)
Time Apply to winter wheat from wheat emergence to the two-node stage. For downy brome, apply from one-leaf to two-tiller growth stage. See label for application timing and weed size.
Remarks Treat heavy infestations before they compete with the crop. A recommended adjuvant must be tank mixed with Osprey as specified on the label. Do not apply Osprey more than once per crop year.
Caution For winter wheat only.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
mesosulfuron + thiencarbazone (Osprey XTRA)
Suppression only
Rate 0.013 to 0.018 lb ai/A (3.2 to 4.75 oz/A Osprey XTRA)
Time Apply to winter wheat from wheat emergence to the two-node stage. Apply from one-leaf to two-tiller growth stage. See label for application timing and weed size.
Remarks Use the 4.75 oz/A rate for downy brome. Treat heavy infestations of grassy weeds before they compete with the crop. Use only a non-ionic surfactant and a nitrogen source for adjuvants. Do not apply Osprey XTRA more than once per crop year.
Caution For winter wheat only.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
metribuzin (TriCor DF and other trade names)
Suppression only
Rate 0.094 to 0.38 lb ai/A (2 to 8 oz/A of the 75% DF)
Time Apply when wheat is tillering and has developed one-inch secondary roots.
Remarks Plant the seed at least 1.5 inches deep and increase seeding rate by 10%. Do not apply after wheat begins to joint. Follow label regarding soil type and organic matter. Apply metribuzin when the crop is healthy and actively growing. Metribuzin may be applied more than once per crop season. Allow at least 21 days between applications if wheat is actively growing, or allow 45 days between applications if wheat is growing in adverse conditions, has entered dormancy, or is stressed due to frost damage, disease, drought, or excessive moisture. Do not graze treated fields for 14 days after application or harvest grain within 21 days after last application.
Site of action Group 5: photosystem II inhibitor
Chemical family Triazine
propoxycarbazone (Olympus)
Rate 0.026 to 0.039 lb ai/A (0.6 to 0.9 oz/A Olympus) plus 0.25 to 0.5% nonionic surfactant
Time Apply preplant, preemergence, or postemergence. Preplant and preemergence use limited to 0.6 oz/A rate, which only provides suppression of downy brome. Apply postemergence applications to wheat after the 2-leaf stage begins, but before jointing begins. May be applied in fall or spring, or sequentially. Base application timing on crop stage, not weed stage. Suppression only with spring applications and fall applications of 0.6 oz Olympus/A; control with fall applications of 0.9 oz Olympus/A.
Remarks Do not exceed 1.2 oz/A Olympus per crop year. When applying with fluid fertilizer, spray solution should not be composed of more than 50% liquid nitrogen, and should not exceed 30 lb of actual nitrogen per acre. If applying with liquid nitrogen, use a nonionic surfactant at a maximum of 0.25% v/v.
Caution Do not use with organosilicone-based surfactants.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylaminocarbonyltriazolinone
pyroxasulfone + carfentrazone (Anthem Flex)
See 2(ee) label for control of downy brome
Rate 0.086 to 0.142 lb ai/A (2.75 to 4.55 oz/A Anthem Flex)
Time Apply preplant through 4th tiller, but prior to the first germinating rainfall of the season or prior to weed germination.
Remarks Must have a minimum of 0.4 inch of rain to activate. Wheat must be planted a minimum of 1 inch deep, but not more than 1.5 inch deep for preplant or preemergence applications. For herbicide resistance management, apply a spring postemergence grass herbicide.
Caution Do not exceed a total of 4.5 oz of Anthem Flex per season. Do not apply to Durum wheat. See label for rotational restrictions. Do not make postemergence applications to foliage that is wet from dew, rain, or irrigation, as increased speckling may occur.
Site of action (pyroxasulfone) Group 15: very-long-chain fatty acid synthesis inhibitor; (carfentrazone) Group 14: protoporphyrinogen oxidase inhibitor.
Chemical family (pyroxasulfone) Isoxazoline; (carfentrazone) Triazolinone
pyroxsulam (PowerFlex HL)
Rate 0.016 lb ai/A (2.0 oz/A PowerFlex HL)
Time Apply in either fall or spring to actively growing winter wheat from the three-leaf to jointing stage and after most weeds have emerged. Apply with a nonionic surfactant (0.25% to 0.50% v/v) and ammonium sulfate (1.5 lb/A).
Remarks When applying with fluid fertilizer, spray solution should not be composed of more than 50% liquid nitrogen, and should not exceed 30 lb of actual nitrogen per acre. If applying with liquid nitrogen, use a nonionic surfactant at a maximum of 0.25% v/v, instead of crop oil concentrate. Suppression only of downy brome with spring applications.
Caution For winter wheat only. Do not mix with products containing dicamba or amine formulations of 2,4-D or MCPA or organophosphate insecticides. Consult label for crop rotation restrictions.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Triazolopyrimidine sulfonamide
quizalofop (Aggressor)
CoAXium wheat with the AXigen trait only
Rate 0.055 to 0.0825 lb ai/A (8 to 12 oz/A Aggressor)
Time Apply postemergence to CoAXium wheat with the AXigen trait after 4-leaf but prior to jointing. Apply when weeds are actively growing and before grasses exceed 4 to 5 leaves.
Remarks Applications must include a surfactant. Apply nonionic surfactant at 0.25% v/v, crop oil concentrate up to 1% v/v or 2% under arid conditions, or methylated seed oil up to 1% v/v.
Caution Use only on CoAXium wheat varieties with the AXigen trait. Temporary height reduction or slight leaf yellowing may occur after application; effects can be more pronounced under environmental stress. Do not apply more than 16 oz/A per crop cycle or more than 12 oz/A in a single application. Do not make a second application within 14 days of the first application. Do not harvest treated wheat for forage or hay within 60 days of the last application. Do not tank mix with dimethylamine salt formulations of 2,4-D or MCPA. To prolong the utility of CoAXium wheat and the AXigen trait, do not use the CoAXium Wheat Production System for 2 consecutive crop cycles.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Aryloxyphenoxypropionate
sulfosulfuron (Outrider)
Rate 0.031 lb ai/A (0.67 oz/A Outrider) plus 0.5% nonionic surfactant
Time Apply to wheat preplant, preemergence, or up to jointing stage of growth. For best control of brome species, apply fall postemergence when brome is in two- to three-leaf stage. To suppress brome species in spring, apply up to five-tiller growth stage.
Remarks Early spring applications should be when brome has recovered from cold weather, when most foliage is green, not red or purple. Suppression only of downy brome with spring applications.
Caution Do not use within 60 days of crop emergence if an organophosphate insecticide has been applied in-furrow. Do not tank mix with malathion. Do not plant any crop other than wheat for 1 year after application.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
triallate (Far-Go or Avadex MicroActiv)
Suppression only
Rate 1.25 to 1.5 lb ai/A (1.25 to 1.5 quarts/A Far-Go or 12.5 to 15 lb/A Avadex MicroActiv)
Time Apply preplant and incorporate.
Remarks Incorporate lightly in two directions at right angles. Some stand thinning may occur on clay knobs or where wheat is dusted in, due to dry conditions. Do not graze.
Site of action Group 15: very long chain fatty acid synthesis inhibitor
Chemical family Thiocarbamate
trifluralin (Treflan HFP and other trade names)
Rate 0.75 to 1.0 lb ai/A (1.5 to 2.0 pints/A Treflan HFP)
Time Apply after final seedbed preparation any time from three weeks to immediately before planting with a deep-furrow drill, or after planting with a double-disk drill.
Remarks Incorporate within 24 hr after application, using a flextine harrow, in two directions, at right angles. Deep furrow seeding must follow preplant incorporation. Incorporation after planting must be shallow. See label for crop rotation limitations.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline