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«Weeds: Mike Moechnig, Darrell L. Deneke, Leon J. Wrage, Jill Alms, Dave Vos, and Mark Rosenberg Insects: Adrianna Szczepaniec and Buyung Hadi ...»

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Clarity may be used in sequential or tank-mixes, including Accent, Beacon, Celebrity, Eradicane, Gramoxone (burndown), Hornet, Liberty (LL corn), Permit, Python, Roundup (RR corn), Stinger, TopNotch, Touchdown (RR corn), or 2,4-D. Refer to label restrictions or the section for each herbicide.


PRE or EPOST. Use 0.5-1 pt dicamba 4L + 1.25-2 pt atrazine 4L. Use lower dicamba rate on light soil. Apply rates above 0.5 pt dicamba 4L before corn exceeds 5-leaf stage. Do not use crop oil or surfactants. Follow crop rotation guidelines for atrazine. Other atrazine formulations can be used.


PRE. 1.3-1.67 pt Dual II Magnum with 1 pt dicamba 4L per acre. Postemergence dicamba following preplant or preemergence treatments usually provides better control and is preferred for perennials. Plant corn at least 1.5 inches deep. Risk of corn stunting if heavy rain occurs at emergence. Use only on medium or fine textured soils with over 2.5% O.M. Not for furrow-planted corn.

Minimum carrier is 10 gpa.


PRE or POST. Add 2.5-4 qt Micro-Tech 4L with 0.5-1 pt dicamba 4L per acre. Use only on fine-textured soil with over 3% O.M. Crop should not exceed 3 inches. Adjust rates according to soil texture. Minimum carrier is 10 gpa.


PPS or PRE. Add 1.85-3.75 pt Surpass or 1.7-3.4 pt Harness per acre. Do not apply preemergence on soil less than 2.5% O.M.


PPS or PRE. Add 16-32 oz Frontier or 10-21 oz Outlook per acre. Do not apply on soil with less than 3% O.M.


PRE. Add 3.6 pt Prowl or Pendimax 3.3L with 0.75-1 pt dicamba 4L per acre. Use only on medium or fine-textured soil having over 2.5% O.M. Minimum carrier is 10 gpa.

DICAMBA PRODUCT + 2,4-D AMINE PRE or EPOST. Add 0.125-0.25 lb ae 2,4-D with 0.5-1 pt dicamba 4L per acre for preemergence. Add 0.12 lb ae 2,4-D per acre for late postemergence when crop is 8-36 inches or up to 15 days before tassel emergence. Always use drop nozzles for postemergence.

MARKSMAN + DUAL PRE or EPOST. Add 1-1.67 pt Dual II Magnum with 2-3.5 pt Marksman per acre. Use preemergence on fine-textured soil with over 2.5% OM. Apply in corn up to 3 inches.

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MARKSMAN + PROWL or PENDIMAX PRE or EPOST. Add 2.4-3.6 pt Prowl 3.3L with 2-3.5 pt Marksman per acre. For medium, or fine-textured soils with over 2.5% O.M.

Apply in corn up to 2-leaf stage.

4-6 oz Distinct 70WDG (0.125-0.18 + 0.05-0.75 lb ae 2.5-10 oz Status (0.06-0.25 + 0.025-0.1 lb ae) Distinct is a postemergence, translocated herbicide containing 50% dicamba + 20% diflufenzopyr and Status contains 44% dicamba + 17% diflufenzopyr + safener. Diflufenzopyr is an auxin transport inhibitor that blocks movement of natural auxins and growth regulators from active meristematic regions in the stem and roots. The safener in Status reduces the potential for corn injury. These herbicides give very good to excellent control of many annual broadleaves including waterhemp and normal or ALS kochia. They also control perennials such as Canada thistle and field bindweed.

Rates are 4-7 oz/A for Distinct or 2.5-10 oz/A for Status. When tank mixing with glyphosate or glufosinate, Status may be used at 2.5 oz/A for increased broadleaf weed control or 5 oz/A for perennial weeds or weeds taller than 6 inches. With Distinct, crop tolerance is best at 4-8 inch corn under most conditions. Early application is suggested.

Minimum carrier is 3 gpa for ground equipment. For Distinct, add NIS (1 qt/A) and either 28% N (5 qt/100 gallons or 1.25% v/v) or AMS (minimum of 5 lb/100 gallons). For Status, add a surfactant such as NIS (1 qt/100 gallons or 0.25% v/v), COC (1-2 pt/A), or MSO (1-2 pt/A) with a nitrogen fertilizer such as UAN (5 qt/100 gallons or 1.25% v/v) or AMS (5-17 lb/100 gallons). Do not tank mix with other growth regulator herbicides (site of action 4), such as dicamba, 2,4-D, or clopyralid, or apply one of these herbicides within 15 days of applying Distinct or Status. Do not tank-mix with emulsifiable concentrate chloroacetamide herbicides such as Dual II Magnum, Harness, Outlook, or Surpass. Do not plant any crop within 120 days after application unless 1 inch of rainfall is received after Distinct applied at less than 4 oz/A or Status at less than 5 oz/A. Forage may be harvested 32 days and grain harvested 72 days after application.

POST. For Distinct, apply 4-6 oz/A on corn 4-10 inches tall; 4 oz/A for corn 10-24 inches tall, or 4 oz/A with drop nozzles to corn 24-36 inches tall. For Status, apply 5-10 oz/A on corn 4-36 inches tall (V10 growth stage) in conventional corn or 2.5-10 oz/A when tank-mixed with glyphosate or glufosinate.

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CELEBRITY PLUS (nicosulfuron + dicamba + diflufenzopyr) Use 4.7 oz Celebrity Plus premix which provides 0.66 oz nicosulfuron (Accent) plus 4 oz Distinct per acre. Apply as for tank-mix.

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Distinct/Status is used as a sequential with a preemergence grass herbicide such as Outlook or Guardsman (do not tank mix with these) or tank-mixed with a postemergence grass herbicide. Tank-mixes for most situations are listed below. Do not tank-mix with other products containing dicamba, 2,4-D, or clopyralid. Follow crop size and carrier requirements for tank-mix or combination partners.


POST. Tank-mix with 0.75-1.5 lb ai atrazine. Good combination to add residual control.

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POST. Reduce rate of Distinct to 3 oz for 4-24 inch corn with weeds less than 6 inches tall.

28 www.iGrow.org Aim is a contact herbicide for broadleaf weeds. It has little or no residual activity. It controls normal and ALS resistant kochia.

Velvetleaf control is excellent; it also controls black nightshade, redroot pigweed, and lambsquarters.

Ragweed and sunflower are less sensitive and require tank-mix partner. Atrazine tank-mix adds control of weeds such as buffalobur, cocklebur, Venice mallow, and waterhemp. Performance on velvetleaf and waterhemp has been very good in SDSU tests. Crop tolerance is adequate.

Rate is 0.5 oz Aim 1.

9L. Apply when weeds are 1-4 inches. Larger weeds may not be completely controlled. Warm, humid conditions favor activity. Action on weeds is rapid; membrane disruption results in rapid necrosis. Minimum carrier is 10 gpa for ground equipment. Add NIS at 2 pt/100 gal; COC may be used under very dry conditions but crop response (speckling) may be noted.

Avoid concentration into leaf whorl. Avoid application within 8 hours of rain before or after application. There are no crop rotation restrictions for the following season.

BURNDOWN. For emerged weeds in no-till. Maximum rate is 1.9 oz total for preplant and in-crop use. Use COC additive. Additional burndown herbicide may be required for grass and large weeds.

POST. Postemergence up to eight collars. Rate is 0.5 oz of 1.9L per acre. Aim can be applied with drop nozzles or as a directed spray at rates up to 1.9 oz per acre.

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Tank-mixes with postemergence herbicides for many situations are listed below. Labeling also allows tank-mixes with 2,4-D amine, Accent, Accent Gold, Banvel, Basis, Basis Gold, Beacon, Callisto, Clarity, Distinct, Hornet, Lightning (Clearfield corn), NorthStar, Permit, Roundup (RR corn), Shotgun, Steadfast, Sterling, and Touchdown. Tank-mixes with Accent, Accent Gold, atrazine, Basis Gold, Roundup (RR corn), and Shotgun require additives that may include NIS, COC, 28% N, or AMS. Do not mix Aim with emulsifiable concentrate formulations, fertilizer, or additives other than given on label. Add Aim to the tank first. Refer to the label or section for each herbicide alone.

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8-32 fl oz Rage D-Tech (0.008-0.03 lb ai + 0.25-1 lb ae) Controls several broadleaf weed species, including winter annuals (mustards, horseweed, and others) and summer annuals (common lambsquarters, pigweed, kochia, velvetleaf, and others). Apply to actively growing weeds less than 4 inches tall or rosettes less than 3 inches in diameter.

Minimum carrier is 10 gpa for ground application or 3 gpa for aerial application. Increase carrier rates (15 gpa for ground or 5 gpa for aerial) for large weeds, high densities, or dense residue. Coverage is important for good weed control. Add NIS (0.25% v/v or 1 qt per 100 gallons spray solution), COC (1.5 gallons spray solution). In addition to NIS, COC, or MSO, add liquid nitrogen fertilizer (2-4% v/v or 2-4 gallons per 100 gallons spray solution) or AMS (2-4 lb/A).

For preplant burndown applications, may tank mix with glyphsoate, glufosinate, paraquat, atrazine, Authority products, and others.

Use appropriate adjuvants for the selected tank-mix partner. Do not apply to light, sandy soils or soils containing less than 1% organic matter.

PPS. Apply to weeds less than 6 inches tall. May apply up to 8 fl oz/A 3 days prior to planting, 9-16 fl oz 7 days prior to planting, or 17-32 fl oz 14 days prior to planting. Use higher rates when weeds exceed 4-6 inches tall, high weed densities, or dense residue.

POST. Apply up to 8 fl oz/A from emergence up to the 5-leaf stage (8 inches) or use drop nozzles to apply up to 32 fl oz/A to corn with less than 14 leaf collars (36 inches).

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CADET (fluthiacet-methyl) Site of Action: 14

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Cadet is a PPO-inhibiting herbicide with a similar mechanism of action as Aim. The standard rate range is 0.6-0.9 fl oz/A depending on the size of the weeds. Use 0.4 oz/A when tank mixing with a glyphosate product. Controls some common broadleaf weed species, such as pigweed, waterhemp, lambsquarters, velvetleaf, and nightshade. Generally controls broadleaf weeds 2-6 inches tall, but may control velvetleaf up to 36 inches tall. Controls or injures weeds within 48 hours. Control may decline if weeds ar large or not actively growing. May be tank mixed with several broadleaf or grass herbicides.

Thorough coverage is important to optimize control. Minimum carrier is 15 gpa for ground applications or 5 gpa for aerial applications.

Use up to 40 gpa if canopy is dense. May use NIS (0.25% v/v or 1 qt per 100 gallons), COC up to 2.5% v/v (recommended during dry conditions), or a silicone based surfactant (0.25% v/v or 1 qt per 100 gallons). May also add UAN at 1-2 qt/A or AMS. Do not irrigate or apply within 4 hours of precipitation. Do not harvest or feed forage until 30 days after application or harvest grain until 90 days after application. Do not mix or load within 50 feet of a well, sink holes, streams, rivers, lakes, or reservoirs.

POST. Apply from the second collar growth stage (V2) to 48 inches tall corn or prior to tasseling, whichever comes first.

Resource is a contact herbicide used to control certain annual broadleaf weeds. Apply from the 2-leaf through 10-leaf crop stage. Count leaves with visible leaf collars. Velvetleaf is the most sensitive weed. Control has been very good in SDSU tests.

Lambsquarters and ragweed also labeled for Resource alone. It is frequently used in a tank-mix.

Resource activity is enhanced by COC adjuvants. COC is added for Resource alone and in some tank-mixes. Addition of 28% N at 2 gal/100 gal or AMS at 2.5 lb per acre improves activity.

Minimum carrier is 10 gpa for ground, not labeled for air. Do not apply if rain is expected in 1 hour. Do not graze or use forage for 28 days after treatments. There are no crop rotation restrictions for the next season.

POST. Rates are 4-6 fl oz per acre. Use COC at 1 pt per acre. Rates up to 8 fl oz may be used with COC at 1 qt per acre applied with drop nozzles. Labeling includes velvetleaf up to 10 inches.

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Resource is tank-mixed with herbicides listed below. Other herbicide tank-mixes include: Accent, Basis, Basis Gold, Beacon, Bromoxynil, glyphosate (RR corn), Hornet, Lightning (CF corn), Marksman, NorthStar, Permit, and Stinger. Refer to label restrictions or the section for each herbicide.


POST. Add 4 oz Resource with 0.6-1.2 lb atrazine 90DF or 1-2 pt 4L per acre. Crop stage is 2-leaf to 12 inches. Use COC at 1 pt per acre.

RESOURCE + ACCENT POST. Add 4-8 oz Resource with 0.66 oz Accent 75DF per acre. Crop stage is 2-leaf to 36 inches or 10-leaf. Do not use adjuvants.


POST. Add 4 oz Resource with 0.5 pt dicamba 4L per acre. Crop stage is 2-leaf to 36 inches or 10-leaf. Do not use adjuvants.

RESOURCE + 2,4-D POST. Add 4 oz Resource with 0.25 lb ae 2,4-D ester or amine per acre. Crop stage is 2-leaf to 8 inches; use drop nozzles after 8 inches. Do not use adjuvants with 2,4-D ester, add NIS at 1 qt/100 gal with 2,4-D amine. Crop may develop temporary brittleness.

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POST. Excellent control of cocklebur. Very good control of sunflower and velvetleaf. Control is best on actively growing, small weeds. Lower rate is for cocklebur under 6 inches, velvetleaf under 2 inches, and sunflower under 4 inches. Use higher rate for cocklebur up to 10 inches, velvetleaf to 5 inches, and sunflower to 6 inches. For Canada thistle, use high rate and retreat if necessary.

Use COC at 1 qt in minimum of 20 gpa carrier with minimum of 40 psi pressure for ground and 1 pt COC per acre in minimum of 5 gpa at 40 psi for air. Velvetleaf control is improved with 28% N at 2 qt per acre as part of the carrier. Corn is usually at the 1- to 5-leaf stage when treated. Primarily for special situations where maximum crop safety is important. Drift to adjacent crops such as soybeans, small grain, or forage legumes does not cause visual harm.

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Tank-mix Basagran with one of the following herbicides to expand weed spectrum: Clarity, Distinct, Outlook, Marksman, or Roundup (RR corn). Refer to label restrictions and directions for each herbicide.

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