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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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PROWL or PENDIMAX & ACCENT or BEACON or ACCENT + BEACON PRE & POST. Sequential application. Apply Prowl or Pendimax preemergence surface at planting; then follow with the sequential postemergence treatment. Accent may be used at 0.33 oz-0.66 oz on weeds under 3 inches; use 0.66 oz Accent per acre on larger weeds. Beacon is used at 0.38-0.76 oz per acre. Accent + Beacon tank-mix rates are 0.33 oz Accent + 0.38 oz Beacon per acre.

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POST INCORPORATED. Intended to control late-season grasses. Apply after corn is 8 inches and incorporated with row cultivator.

Cultivate before application to remove emerged weeds and to move untreated soil over corn root zone. Not labeled for preplant or preemergence use as injury can be severe. Not for seed fields. Has limited potential as a general weed program.

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EPP. May apply up to 0.5 lb ae/A at least 7 days prior to planting or 0.5-1 lb ae/A at least 14 days prior to planting.

PRE. May apply up to 1 lb ae/A after corn planting but prior to corn emergence in tilled fields. Seed furrow must be completely closed prior to application to avoid corn injury. Check labels for guidelines as labels may vary.

20 www.iGrow.org POST. Very good control of most emerged annual and perennial broadleaved weeds. Apply before crop is more than 4-5 inches tall for best tolerance. Corn tolerance has been acceptable with early postemergence applications in SDSU tests. Use drop nozzles if corn exceeds 8 inches (soil to tip of whorl leaf). Avoid application during the period of rapid elongation. Do not apply later than 1 week before silking. Risk of brittleness increases in cool and wet or hot and humid conditions.

Wind storms may cause lodging or breakage. Hybrids vary in tolerance; however, hybrid susceptibility is also affected by growing conditions. Drop nozzles reduce risk of injury. Avoid cultivation for 7 days after spraying. Do not use wetting agents or other additives. Slightly higher rates will improve perennial weed control, but risk of injury increases.

Less risk of vapor drift with amine formulations. Reduce risk of droplet drift by using less than 20 psi pressure and using at least 20 gpa carrier. Soybeans will be affected more at bloom stage. Sunflowers are more seriously affected as plant size increases.

HARVEST AID. Apply after silks are brown or after black-layer stage. Substantially reduces viability of cocklebur and sunflower seed if first flush was controlled in early season. Good retreatment for perennials. Excellent crop tolerance. Use 1 lb ae of ester or amine per acre with high-clearance sprayer. Check labels for aerial application.

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*2,4-D showing 3.8lb/gal is the same as 4 lb/gal, and 5.7 lb/gal is the same as 6 lb/gal acid equivalent. The lower values reflect new laboratory methods; products have not changed.

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EPPS, PRE, POST. Premix containing 1 lb ae 2,4-D + 2.25 lb ai atrazine per gallon. A 2 pt rate provides 0.25 lb ae 2,4-D + 0.56 lb ai atrazine per acre. The rate is 2-3 pt per acre for early preplant surface application 7-14 days before planting or for preemergence applications 3-5 days after planting but before corn emerges. The low rate is for coarse, low-organic-matter soil. The postemergence rate is 2 pt per acre at spike to 4-leaf (8 inches) stage. Drop nozzles are required for 8- to 12-inch corn or if the 3 pt per acre rate is used at any stage. Spike to 2-leaf stage applications have best crop tolerance and are preferred. Minimum carrier is 10 gpa for ground and 3 gpa for air. Follow carryover restrictions as for atrazine alone and precautions for 2,4-D alone. Tank-mix is not labeled.

Pre or early postemergence application in corn to control some grass weed species such as foxtail, wild oats, and barnyardgrass and several broadleaf weed species such as lambsquarters, pigweed, mustard, and others.

Label recommends 1 oz/A for most situations and suggests tank-mixing with glyphosate for added residual control in Roundup Ready corn. Recommended carrier volume 15 gpa for most circumstances or 10 gpa for low weed densities. Minimum carrier volume is 5 gpa for aerial applications. Adequate soil moisture for plant growth will enhance herbicide activity. Resolve is absorbed by weed roots, so sprinkler irrigation (0.5% in) or rain within 5-7 days of application is necessary for adequate control. If this activating precipitation is not received, follow with cultivation or a postemergence herbicide application as needed.

Postemergence applications should include a NIS (0.25% v/v or 1 qt per 100 gallons spray solution) and nitrogen fertilizer (either AMS at 2 lb/A or UAN (28% or 32% N) at 2 qt/A). Adjuvants are not needed if Resolve is tank-mixed with glyphosate or glufosinate herbicides that contain premixed adjuvants. For burndown applications prior to corn emergence, COC (1% v/v or 1 gallon per 100 gallons spray solution) or MSO (0.5% v/v or 2 qt per 100 gallons spray solution) may be added in place of NIS.

POST. May be applied in corn up to 12 inches tall or less than 6 leaf collars.

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May be tank-mixed with glyphosate (Roundup Ready corn) or glufosinate (Liberty Link corn). Greater broadleaf control may be achieved by tank-mixing with 1/3-2/3 pt/A Starane or 2-4 fl oz of Banvel or Clarity. Tank-mixtures with 2,4-D will result in severe grass control antagonism.





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Controls or suppresses several grass weed species, such as foxtail, barnyardgrass, woolly cupgrass, and others, and b r o a d l e a f weed species such as pigweed, kochia, velvetleaf, mustards, small dandelion, and others. Provides control of emerged weeds (1-3 inches tall) and limited residual control. Resolve Q at 1.25 oz/A provides the similar amount of active ingredient as Resolve 25SG at 1 oz/A and Harmony 50SG at 0.1 oz/A. This is a greater amount of Resolve and less amount of Harmony compared to Basis or Basis Blend, so Resolve may have slightly greater grass activity. Rainfall within 5-7 days after application may improve residual weed control. May be tank-mixed with glyphosate (Roundup) or glufosinate (Liberty) herbicides.

Follow adjuvant recommendations and carrier volumes as described for Resolve.

PPS or PRE. Appy 1.25-2.5 oz wt/A prior to corn emergence. Do not apply pre-emergence on coarse texture soils with less than 1% O.M. Do not apply more than 1.25 oz/A if planning to use another rimsulfuron containing product POST.

POST. Apply to corn up to 20 inches tall or less than 7 leaf collars. Do not apply more than 1.25 oz/A post-emergence.

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Basis: 0.33-0.5 oz wt/A, Basis Blend: 0.825-2.5 oz wt/A Basis is intended for early postemergence grass control. It provides good to excellent control of green, bristly, yellow, and giant foxtail, barnyardgrass, and fall panicum. Basis also controls early flushes of smartweed, lambsquarters, mustard, and pigweed.

Basis may be tank-mixed for additional broadleaf control. Wild oat, quackgrass, woolly cupgrass, wild proso millet, and smooth crabgrass are not controlled adequately. Basis is 50% rimsulfuron and 25% thifensulfuron, so Basis at 0.33 oz contains the equivalent active ingredient as 0.66 oz Resolve 25SG and 0.17 oz Harmony 50SG. Basis Blend contains 20% rimsulfuron and 10% thifensulfuron. The post-emergence rate of Basis is 0.825 oz/A. This is equivalent to the amount of rimsulfuron and thifensulfuron applied using Basis.

Early-season weed control has been satisfactory in SDSU tests; late flushes require cultivation 10-15 days after application.

Applications should be made when grasses are 1-2 inches and actively growing. Crop tolerance has been good in SDSU tests.

Avoid late application. Apply to hybrids with a relative maturity rating of 88 days or more. Consult your seed supplier before applying to specialty corn or hybrids or less than 88 days relative maturity.

Do not apply Basis to corn treated with Counter 15G or 20CR; Basis may be applied to corn treated with Fortress, Force, or Aztec insecticide. Applications made to corn treated with other soil insecticides may cause unacceptable crop injury. There are no restrictions for Basis in “IR” corn previously treated with any insecticide. Basis should not be tank-mixed with foliar applied organophosphate insecticides, Basagran, Beacon, or other ALS herbicides. To avoid antagonism or crop injury, apply these products 7 days prior to or 3 days after Basis applications. Add COC at 1-2 gal/100 gal plus 28% N at 2-4 qt or AMS at 2-4 lb per acre. Minimum carrier is 15 gpa for ground or 5 gpa for air.

Soybeans may be planted 15 days after treatment; winter cereals after 4 months; spring cereals after 8 months; alfalfa, grain sorghum and sunflower after 10 months. Applying tank-mixes with dicamba to small corn (V-3 stage or smaller) during stress conditions may increase the chance of rattail after the V-11 stage of growth.

BURNDOWN. Apply Basis (0.33-0.5 oz wt/A) or Basis Blend (0.825-2.5 oz wt/A) as a fall treatment prior to ground freezing or in the spring prior to corn planting. Refer to tank-mix partner label for rates and precaution information.

POST. Apply Basis (0.33 oz wt/A) or Basis Blend (0.825 oz wt/A) as a broadcast or banded treatment on field corn that is spike to 4-leaf (2 collar) growth stage, prior to emergence of the third collar and/or less than 6 inches tall.

REALM Q (rimsulfuron + mesotrione) Site of Action: 2+27

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Standard rate is 4 oz which provides the similar active ingrediants as Resolve 25SG at 1.2 oz/A and Callisto at 2.5 oz/A. Best results if applied to small (1-2 inch grasses or broadleaves less than 5 inches), actively growing weeds. Do not apply to field corn grown for seed. Do not apply more than 4 oz Realm per growing season. Thoroughly clean the application equipmenat immediately after use.

22 www.iGrow.org Minimum carrier volume is 10 gpa for ground applications. Do not apply with aerial applicator. Prefered adjuvants are COC + AMS.

Apply COC at 1% v/v (1 gallon per 100 gallons spray solution) or 2% v/v during dry conditions. Also add AMS at 2 lb/A or UAN (27 or 32% N) at 2 qt/A. Instead of COC, NIS (0.25% v/v or 1 qt per 100 gallons spray solution) may be added. Do not add adjuvants that significantly alter the solution pH.

May tank-mix with glyphosate (Roundup), glufosinate (Ignite), and several other herbicides. Check label guidelines for appropriate adjuvants when tank mixing other herbicides. Use only NIS (no AMS or UAN) if tank mixing Cinch or Breakfree postemergence or leaf burn may result. Do not tank mix with Basagran or organophosphate insecticides such as Lorsban, malathion, and parathion.

Rotation restriction is 4 months for winter wheat; 9 months for spring wheat; and 10 months for soybeans, sunflowers, sorghum, alfalfa, flax, and canola.

POST. It is best to apply when corn is less than 12 inches tall, but may apply to corn up to 20 inches tall or 7 leaf collars.

REQUIRE Q (rimsulfuron + dicamba) Site of Action: 2 + 4

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Multipack containing rimsulfuron and dicamba. Controls or suppresses several grass weed species, such as foxtail, barnyardgrass, woolly cupgrass, and others and broadleaf weed species such as pigweed, kochia, Russian thistle, velvetleaf, mustards, small dandelion and others. Provides control of emerged weeds (1-3 inches tall) and limited residual control. Rainfall within 5-7 days after application may improve residual weed control. May be tank mixed with glyphosate or glufosinate herbicides. Require Q qt 4 oz/A contains the equivalent active ingredients as 1 oz/A Resolve SG and 4 oz/A Clarity. Applications during periods of rapid growth may result in temporary corn leaning.

Follow adjuvant recommendations and carrier volumes as described for Resolve.

POST. Apply to corn from 4 inches tall (2 leaf collars) up to 20 inches tall (less than 7 leaf collars).

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To improve kochia control, tank mix with Starane (fluroxypyr) at 1/3-2/3 pt/A. To improve residual weed control, tank mix with Cinch (s-metolachlor), Cinch ATZ (s-metolachlor + atrazine), Breakfree (acetochlor), Breakfree ATZ (acetochlor + atrazine), or Outlook (dimethenamid). For additional foliar and residual control, tank mix with Lumax (s-metolachlor + mesotrione + atrazine) at 2 pt/A and include a NIS. For improved burndown weed control, tank mix with Impact at 0.5-0.75 oz/A plus atrazine at 0.4-1.5 lb ai/A.

Excellent control of shattercane and good to excellent control of green and giant foxtail. Accent also controls barnyardgrass, yellow foxtail, sandbur, woolly cupgrass, and quackgrass. Pigweed and smartweed are controlled.

Foxtail, wild oat, sandbur, and woolly cupgrass should not exceed 2-3 inches, shattercane 4-12 inches, and quackgrass 4-10 inches. Results are more variable if grasses such as yellow foxtail or barnyardgrass are present. Corn tolerance has appeared good in SDSU tests. Cultivation 10-14 days after application will control late weed flushes.

Weeds stop growth soon after treatment but yellowing or stunting is not apparent for several days. Results are best when weeds are growing rapidly and plants are free of stress. Thorough coverage is important. Always add COC at 1 gal/100 gal or NIS at 1-2 qt/100 gal. Use 28% N at 2-4 qt or AMS at 2-4 lb per acre. Rainfall within 4 hours of application will reduce effectiveness. Minimum carrier is 10 gpa for ground or 3 gpa for air. Increase the carrier to 15 gpa for ground or 5 gpa for air under less favorable conditions.

Avoid concentrating spray into plant whorl. Two-nozzle units are suggested for banding.

Do not apply Accent to corn that was treated with Counter 15G or 20 CR at planting.To avoid crop injury or antagonism, apply Basagran, 2,4-D, or organophosphate insecticides such as Lorsban, Malathion, Parathion, etc., at least 7 days before or 3 days after application of Accent. Fortress, Aztec, and other non-organophosphate insecticide treated fields can be treated with Accent.

POST. Apply on corn up to 20 inches or up to and including 6 collars, whichever is most restrictive. Early application is important;

especially in heavy infestations. Late applications to control escaped grasses or as a rescue treatment may be made using drop nozzles for 20-36 inch corn. Do not apply after corn is 36 inches or has 10 or more collars.



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