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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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Tank-mix partners may include atrazine, Ignite, glyphosate products, Define SC, Accent, Option, Stout, Steadfast, and bromoxynil products. Add atrazine at 0.5 lb ai/A to increase broadleaf and grass weed control or increase control of weeds greater than 6 inches tall. With atrazine, it is recommended to use COC at 1% v/v + UAN at 1.5 qt/A or AMS at 8.5 lb/100 gal but may use MSO at 1% v/v + UAN at 1.5 qt/A in dry conditions. Do not use MSO or COC when tank-mixing with glyphosate or Ignite. With Ignite, Laudis may be applied at 2-3 oz/A and add AMS at 8.5 lb/100 gal (1.5 lb/A). With bromoxynil products, it is recommended to use COC rather than MSO.

Capreno is a premix containing Laudis (tembotrione + safener) and thiencarbazone, an ALS-inhibiting herbicide that primarily improves grass control, but also has activity on some broadleaf weed species. Capreno controls broadleaf weed species such as lambsquarters, pigweed, kochia, ragweeds, velvetleaf, Russian thistle, waterhemp, and others. Controls grass weed species such as foxtail (green, giant, yellow), barnyardgrass, crabgrass, wild oat, field sandbur, and others.

Add COC at 1% v/v (1 gal per 100 gal spray solution) or a minimum of 1.25 pt/A and a nitrogen fertilizer such as UAN at 1.5 qt/A or AMS at 1.5 lb/A or 8.5 lb per 100 gal spray solution. High surfactant oil blends (HSOB) may be used in place of COC to minimize adjuvant antagonism with glyphosate. Use of NIS may result in inconsistent and incomplete weed control.

Minimum carrier rate is 10 gpa for ground applications (do not apply by air). Rainfall within 1 hour after application may reduce weed control. Applications to wet foliage may reduce control. Do not apply Capreno in the same year as Lorsban, Counter, Dyfonate, or Thimet. Do not graze or harvest for forage within 45 days after application.

Rotation interval is 4 months for wheat; 10 months for barley, soybeans, sweet corn, sorghum; 18 months for alfalfa, oats, sunflower, and canola. If soil pH is greater than 7.5, increase rotation restrictions to the next higher interval or 24 months for crops in the 18-month interval.

POST. Apply from the V1 (1 leaf collar) to the V6 corn growth stage. Best results if applied to young, actively growing weeds.

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Atrazine: Tank-mixing atrazine at 0.5 lb ai/A may increase the spectrum and consistency of weed control. Do not use atrazine on corn greater than 12 inches tall.

Ignite: For corn designated as Liberty Link only. Capreno may be used at 2 fl oz/A when tank-mixing with Ignite at 22 fl oz/A. Only use AMS and avoid the use of COC or MSO/ESO.

Glyphosate (e.g., Roundup): For use on glyphosate-tolerant corn. Capreno may be used at 3 fl oz/A when tank-mixing with a glyphosate product. It is recommended to use glyphosate-compatible HSOB rather than COC with loaded glyphosate products, but is required in non-loaded glyphosate products. Use AMS at recommended rates.

Buctril: Capreno may be used at 3 fl oz/A with Buctril up to 6 fl oz/A to aid in control of difficult broadleaf weeds such as common ragweed. Buctril may be used in place of atrazine in corn greater than 12 inches tall. Use of COC and N fertilizer is recommended.


DEFINE (flufenacet) Site of Action: 15 15-25 oz Define SC 4L (0.47-0.78 lb ai) Define is a soil-applied herbicide with shoot uptake. It controls annual grasses and small-seeded broadleaf weeds. Higher rates are suggested for yellow foxtail and sandbur. Rates vary for Define applied alone or tank-mixed with another soil-applied herbicide or used in sequence with a postemergence herbicide. Define SC is a flowable formulation containing 4 lb/gal active.

Corn and soybeans may be planted any time after application. Potatoes can be planted after 1 month; sugarbeets after 4 months;

all other field crops may be planted after 12 months.

FALL. Apply after October 15 when soil temperature is less than 50o F. Use only on medium- and fine-textured soils with over 2.5% O.M.

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PPI, PRE. Rates for Define used alone are 15-25 oz per acre up to 14 days before planting. Incorporate 1-2 inches deep. For soils with less than 3% O.M. use 15 oz for coarse texture, 17-19 oz for medium texture, and 22-24 oz per acre for fine texture. Soils with more than 3% O.M. use 17 oz on coarse texture, 19-22 oz on medium texture, and 22-25 oz per acre on fine texture. Apply prior to crop or weed emergence.

EPOST. Apply early postemerge through 5th leaf collar stage. Use AMS in postemerge tank-mixes if required. Liquid fertilizer may result in leaf burn.

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Define may be tank-mixed with several preemergence and postemergence herbicides including atrazine, Balance Pro, Banvel, Clarity, Epic, Glyphosate, Prowl, Python, Marksman, Gramoxone, Liberty, Buctril, and 2,4-D. Labeling lists sequential herbicides either before or following Define that may be used to control additional weeds.

Broadleaf herbicide with residual activity. Use 0.8-0.89 oz on coarse soils and 0.89-1 oz per acre on medium to fine soils for kochia, Russian thistle, common lambsquarters, Venice mallow, wild mustard, redroot pigweed, smooth pigweed, velvetleaf, and common waterhemp, including triazine resistance biotypes of these weeds. Use the higher rate on soils with greater than 3% OM. Do not apply these rates more than 14 days before planting. Use 0.89-1 oz on coarse soils and 1.14-1.33 oz per acre on medium to fine soils for marestail, ladysthumb, black nightshade, and wild sunflower. Giant ragweed is partially controlled and cocklebur, common ragweed, and jimsonweed are partially to variably controlled. Use the higher rate on soils with greater than 3% O.M. and/or when applications are made 14-30 days before planting.

Do not exceed 1.4 oz per acre in a single crop year. Do not exceed 0.07 lb ai cumulative flumetsulam per acre if using sequential or tank-mix applications. Do not apply more than 30 days before planting or less than 85 days before harvest. Do not apply on soils that have a pH greater than 7.8 or contain greater than 5% O.M. and the pH is less than 5.9. Applications on soils with less than 1.5% O.M. may cause crop injury. Approved for ground application only.

Applications made under adverse (dry or cold) conditions result in less effective weed control. Do not apply under conditions which favor runoff or erosion of soil. Corn must be planted at least 1.5 inches deep. Do not use on corn treated with Counter or Thimet insecticides. Other insecticides should be applied in T-band or band. Organophosphate insecticides including Counter or Thimet can be applied to IR or IMR hybrids. IR or IMR hybrids may reduce injury to corn from Python on soils with less than 1.5% OM or pH greater than 7.8.

Follow crop rotation guidelines. Alfalfa, dry beans, peas, and small grains may be planted after 4 months; grain sorghum, 12 months; sunflower, 18 months; and canola, 26 months plus field bioassay.

FALL. Special label allows 1-1.25 oz 80WDG with 3-4 oz Sencor DF per acre for residual weed control in no-till programs. Apply in late fall when soil temperature has dropped below 50o F.

PPI. Incorporate 2-3 inches deep up to 30 days prior to planting.

PPS. Use in reduced and no-till systems. May be applied up to 30 days prior to planting.

PRE. Apply at planting or after planting, but prior to weed emergence. Rainfall required.

PRE-SPIKE. Use water carrier if corn is emerged and up to 2 inches.

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Tank-mixes of Python for burndown include Gramoxone, Glyphosate Products, and 2,4-D. Tank-mixes of a reduced Python rate (0.8-0.9 oz) in preemergence application include Bicep, Harness Xtra, and Guardsman. Sequential applications of postemergence treatments include Accent Gold and Hornet at reduced rate; Banvel, Clarity, 2,4-D, Marksman, Buctril, or Beacon.

Postemergence Hornet, dicamba, 2,4-D, Marksman, bromoxynil, or Beacon + 2,4-D herbicides may be used if follow-up treatment is required. Refer to label restrictions or the section for each herbicide.

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Hornet WDG contains 18.5% flumetsulam (Python) plus 60% clopyralid (Stinger). Hornet provides residual control of many broadleaf weeds and controls emerged Canada thistle. Use a tank-mix or sequential program for grass control.

Hornet may be applied preemergence. For preplant and preemergence applications use 4-5 oz Hornet WDG on coarse soil and 5-6 oz for medium and fine soil. The high rates are for soil over 3% O.M. or if applying 14-30 days before planting. It is most widely used as a postemergence herbicide for broadleaf weeds. Rates for postemerge application are 2-5 oz per acre.

Refer to the section for Python for soil restrictions for preemergence applications and for restrictions to prevent insecticide interaction with Hornet applied to the soil or postemergence.

Follow crop rotation guidelines to avoid carryover. Small grain can be planted after 4 months; alfalfa, dry beans, peas, soybeans after 10.5 months; grain sorghum after 12 months; sunflower, sweet corn after 18 months; canola after 26 months and field bioassay.

PPS. Hornet may be applied up to 30 days before planting.

PPI. Incorporate into the top 2-3 inches within 30 days prior to planting.

PRE. Apply at or after planting, but prior to crop or weed emergence.

POST-SPIKE. Apply from corn emergence to before corn is 2 inches. Established broadleaf weeds at time of application may be controlled; rainfall is required for those weeds not emerged.

POST. Rates are 2-5 oz Hornet WDG per acre. The 3 oz rate is used for most annual broadleaf weeds. Good Canada thistle activity.

Use higher rates to control heavy infestations, larger weeds, or when a longer period of residual control is desired. Apply from crop emergence (spike) stage to corn through V6 stage (six visible leaf colars) or 20 inches tall, whichever occurs first. For best control, apply when broadleaf weeds are less than 8 inches tall. All postemergence applications must include NIS at 1 qt/100 gal or COC or MSO at 1 gal/100 gal. Do not use liquid fertilizer as the total carrier as crop injury may occur. Do not cultivate for 10 days before or after application. Rainfast in 2 hours. Use a minimum spray volume of 5 gpa for air and 10 gpa for ground application.

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Hornet WDG may be tank-mixed with Gramoxone or glyphosate products for burndown in no-till. Tank-mixes with soil-applied grass herbicides or certain postemerge herbicides add weed spectrum. Do not tank-mix with Basagran.


EPP, PPI, or PRE. Tank-mix 4-5 oz Hornet WDG per acre with labeled rates of the herbicides as a non-atrazine alternative for broadspectrum grass and broadleaf control.


atrazine premix product.

EPP, PPI, or PRE. Tank-mix 3 oz Hornet WDG per acre with labeled rates of the herbicides for improved control of ragweeds, velvetleaf, pigweed, lambsquarters, cocklebur, and sunflower.


POST. Tank-mix 3 oz Hornet WDG with 0.75 oz Callisto plus 0.25 lb ai atrazine per acre. Use 1 gal COC and 2.5 gal 28% N or

8.5 lb AMS per 100 gal solution. Apply up to 12-inch corn. Tank-mix improves pigweed, lambsquarters, waterhemp, kochia, and nightshade control.

HORNET WDG + ACCENT, BASIS GOLD, STEADFAST, or OPTION POST. Tank-mix may also include low rates of dicamba or atrazine. Apply as tank-mix partner label directs. Hornet WDG is labeled for use with NIS, COC, or MSO adjuvants.


POST. Add 4 oz dicamba 4L per acre for improved pigweed, lambsquarters, waterhemp, kochia, and nightshade control. Distinct at 1.5 oz may also be used.


POST. Add 0.5-0.75 lb ai atrazine per acre for improved pigweed, lambsquarters, waterhemp, kochia, and nightshade control.

Apply up to 12-inch corn.

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Good control of several annual grasses and fair control of certain small-seeded broadleaves. Early-season weed control less consistent than for some other treatments. The 3.6 pt of 3.3L per acre rate has been used in most SDSU tests. Prowl H2O is a new water based formulation that has improved performance in high residue and is preferred when tank-mixing post application in corn.

Crop tolerance is adequate if the seed furrow is completely closed and seed planted at least 1.5 inches deep. Do not incorporate.

Plant before applying herbicide. Minimum carrier is 10 gpa for ground or 5 gpa for air. Use 20 gpa for minimum-till systems or when using fertilizer carrier. No label restrictions for crops the following year.

PRE. Apply after planting. Rain critical for good results. Do not harrow before crop emergence. However, if crusting or early weed emergence requires cultivation, use shallow tillage such as a rotary hoe.

POST. Apply until corn is 30 in or has 8 leaf collars. Do not apply in liquid fertilizer.

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POST INCORPORATED. Culti-spray application. Intended for late season annual weeds. Apply from 4 in crop until layby cultivation.

Cutlivate to move untreated soil over the corn root zone before application. Incorporate with cultivation unless there is sufficient rain or irrigation before weed emergence.

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Tank-mixes for most situations are listed below. Additional tank-mixes include Balance, Basis Gold, Bicep, Buctril, Bullet, Dual, Frontier, Guardsman, Harness Extra, Hornet, Lariat, Python, or Surpass. Refer to label restrictions or the section for each herbicide.

PROWL or PENDIMAX + ATRAZINE PRE, POST. Mix 1.8-3.6 pt 3.3L + 1-1.5 lb atrazine per acre. Apply as for Prowl alone. Apply early postemergence before crop has more than 4 leaves and weeds are less than 1 inch tall. Effective for wild proso millet. Corn must be over 4 inches but less than 12 inches tall. Incorporate with cultivator after application.

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