2000 Texas Panhandle & South Plains Field Corn Herbicide Guide. Soil Applied Herbicides

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Barnard Osborne
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1 1 of 9 10/22/02 1:48 PM 2000 Texas Panhandle & South Plains Field Corn Herbicide Guide Matt Rowland and Brent Bean - Texas Ag Extension Service Information is provided as a general information guide only; no discrimination is intended or endorsement implied. Refer to individual labels for specific instructions before using any herbicides listed in this guide. Soil Applied Herbicides Trade Name (common name) atrazine 4L atrazine 90DF Axiom 68DF (flufenacet + metribuzin) Balance 75WDG (isoxaflutole) Bicep II Magnum (metolachlor + 5.5L Product Rate per Acre* Rotation Restrictions Corn or sorghum - immediately; all others - refer to label for rate and soil type lbs 8-20 oz Corn and soybean - immediately; most others oz or Do not rotate to other crops within 6 after application. Corn or sorghum - immediately; soybeans, cotton, peanuts, wheat (check label for specifics) General Comments Apply alone as ppi or pre treatment for control of broadleaf weeds. Combine a grass herbicide for better control of annual grasses. Apply as pre-plant, ppi, or pre treatment for control of certain broadleaves and grasses. Do not apply ppi to seed corn. Plant corn at least 1.5 in. deep. Use is not recommended on soils that have OM of less than 1.5% and a ph greater than 7.5. If applying to medium soils with ph greater than 7.5, reduce rate by 0.25 oz from recommended rate. Excellent on velvetleaf, can be week on grass. Restricted Use May be applied as a pre-plant surface, pre-plant incorporated, or pre-emergence treatment for control of annual grasses & broadleaves. Higher rates are for early pre-plant applications.

2 2 of 9 10/22/02 1:48 PM Bicep Lite II Mag. (metolachlor + 6L Bladex 4L Bladex 90DF (cyanazine) Broadstrike + Dual (flumetsulam + metolachlor) 7.67L Bullet 4EC (alachlor + Dual II Magnum (metolachlor) 7.64EC Epic 58DF (flufenacet + isoxaflutole) Frontier 6L (dimethenamid) Fultime 4L (encapsulated acetochlor + Guardsman 6L (dimethenamid or lbs oz oz Corn or sorghum - immediately; check label for others. Corn - immediately; sorghum - 30 days; check labels for others. Sunflower, cotton - 18 mos; sorghum, potatoes - 12 mos; wheat mos; soybeans, corn - 0 mos Corn, sorghum - following year; others - check with label or product representative. Corn, cotton, peanuts, potatoes, sorghum, soybeans - immediately; wheat Corn - immediately; cotton, soybeans - 6 ; sorghum, wheat oz Corn, sorghum, soybeans - immediately; fall-seeded cereal crops - > 4 See Bicep II Magnum. Contains less atrazine than Bicep II Magnum. Higher rates are for early pre-plant applications. May be applied as a pre-plant or pre-emergence treatment. Provides control or suppression of annual grasses and broadleaves. Can tank mix to increase control. Restricted Use. Can be applied as pre-plant incorporated, pre-emergence, or spike-stage treatment. Will control or suppress annual grasses and broadleaf weeds. Do not use with Counter insecticide. Can be applied as a ppi or pre treatment for control or suppression of certain annual grasses and broadleaves. Apply as a pre-plant incorporated or pre-emergence treatment for control of annual grasses and small-seeded broadleaves. Can be applied as a pre-plant, ppi, or pre treatment for control or suppression of certain annual grasses and broadleaves. Use higher rates if applying pre-plant 7-14 days or in a conservation tillage program. Apply pre-plant, ppi, or pre-emergence to control or suppress certain annual grasses and broadleaves. Not for use on sweet corn See Harness Xtra. See Harness Xtra. 3-5 Corn, sorghum - immediately; cotton, soybeans, peanuts - following year; others - check with label or product representative. Apply pre-plant, ppi, or pre to control or suppress certain annual grasses and broadleaves. Restricted Use.

3 3 of 9 10/22/02 1:48 PM Harness 7L (acetochlor) Harness Xtra 6.0 Harness Xtra 5.6 (acetochlor + Lariat 4L (alachlor + Lasso 4L (alachlor) LeadOff 6L (dimethenamid Alfalfa, cotton, peanuts, sunflowers - 24 ; sorghum - following year; corn - immediately; wheat - 4 Corn - immediately; sorghum, soybeans - following year; wheat - 15 ; most others - 24 Corn, sorghum - immediately; soybeans - following year; wheat and most others - 18 Corn, sorghum - immediately; most others - after harvest. Corn, sorghum-0 mo.; soybeans - following year; wheat - 18 Apply pre-plant, ppi, or pre for control or suppression of annual grasses and small-seeded broadleaves. Apply ppi 14 days prior to planting or apply after planting but pre to weed and crop emergence for control or suppression of certain annual grasses and broadleaves. May also apply Epost to corn under 11" tall. Apply pre-plant, ppi, or pre for annual grasses and broadleaves. Will control or suppress large-seeded broadleaves with use of higher rates. May be applied early pre-plant, ppi, or pre. Good control of annual grasses and small-seed broadleaves. See Guardsman. Micro-tech 4EC (alachlor) Prowl 3.3EC (pendimethalin) Pursuit 70DG (imazethapyr) Pursuit Plus 2.9EC (imazethapyr + pendimethalin) Surpass 20G Surpass 6.4EC (acetochlor) See Lasso. Corn, sorghum - following year; soybeans - immediately; wheat oz Corn mos; sorghum - 18 ; soybeans - immediately; wheat - 4 See Lasso. Do not incorporate. Control or suppression of annual grasses and broadleaves when applied pre or early post. Can be applied through pivot irr. Apply only to IR/IT (IMI) corn. Can be applied as early preplant, ppi, pre, or epost. Good control of cocklebur, nightshade, pigweed, and velvetleaf. 2.5 See Pursuit. Do not incorporate. Apply only to IR/IT (IMI) corn. Control of various broadleaves and better control of grasses as compared to Pursuit alone lbs See Harness. Apply ppi or pre for control of annual grass and broadleaves.

4 4 of 9 10/22/02 1:48 PM Surpass 100 5EC (acetochlor + Topnotch 3.2EC (encapsulated acetochlor) 2-4 See Harness Xtra. Apply ppi within 14 days prior to planting or apply after planting but pre to crop and weeds. Restricted Use See Harness. May be applied ppi, pre, or early post. Use higher rates for nutsedge. Use higher rates if applied days prior to planting. Restricted Use. Foliar Applied Herbicides Trade Name Product Rate Rotation General (common name) Accent 75SP (nicosulfuron) Accent Gold 84WG (nicosulfuron + rimsulfuron + clopyralid + flumetsulam) Aim 40DF (carfentrazone-ethyl) atrazine 4L atrazine 90DF per Acre* Restrictions 0.67 oz Corn - immediately; sorghum - 18 mos; wheat - 4 mos; soybeans - check label; cotton oz Corn - immediately; sorghum - 12 mos; wheat - 4 mos; soybeans ; cotton oz Corn, cotton, sorghum, soybeans - 1 mos; wheat - immediately broad-leaves 2 -grasses 1.33 lbs-broadleaves 2.2 lbs-grass Corn, sorghum - immediately; soybeans - following year; wheat - check label; cotton - following year. Comments Apply broadcast from 2-leaf up to 20";to corn from 20-36" with drops only. Apply to 4-12" shattercane and 4-18" johnsongrass. Do not apply to corn treated with Counter 15G insecticide unless variety is IR. COC preferred over NIS for hot, dry conditions. Apply to corn before 12" tall or 6 collars. Add crop oil and spray optimizer. Do not use ammonium sulfate. Good alternative to Basis Gold in atrazine sensitive areas. Apply to corn up to 8 collars. Do not mix with other EC formulations. Add NIS as an additive. Good velvetleaf control. Apply before corn exceeds 12" high and before most weeds are 4" for broadleaves. Apply before weeds are 1.5" tall for grasses. Add Crop Oil as an additive.

5 5 of 9 10/22/02 1:48 PM Banvel 4L (dicamba) Basagran 4EC (bentazon) Basis 75DF (rimsulfuron + thifensulfuron) Basis Gold 89WG (nicosulfuron + rimsulfuron + Beacon 75WG (primisulfuron) Bladex 90DF (cyanazine) Buctril 2E (bromoxynil) Celebrity 76.8WG (dicamba + nicosulfuron) pt Corn - immediately; sorghum - 15 days; others - after harvest Dependent upon tank mix partner. Check label or with product representative oz 1 packet/4 ac 14 oz 1 packet/4 ac 0.76 oz 1 packet/2 ac Corn - immediately; sorghum - 10 mos; wheat - 4 mos; soybeans - see label.; cotton - 18 Corn - immediately; sorghum - 10 mos; wheat - 10 mos; soybeans - 10 ; cotton - 18 Corn - 15 days; IMI corn - immediately; sorghum, soybeans - 8 ; wheat - 3 ; cotton lbs Corn - immediately; sorghum - 1 ; most others - after harvest. 1-2 Corn, sorghum - immediately; most others - 1 mo oz 1 packet/8 ac Corn - immediately; sorghum - 10 ; soybeans - 1 mo.; wheat - 4 ; cotton - 10 May be applied to corn up to 8" or 5 leaves. Surfactant may be added under dry conditions. Add UAN for velvetleaf. Corn is tolerant to Basagran at all development stages. Add COC as an additive. Provides control or suppression of certain broadleaf weeds. Weak on pigweed. Apply when corn is spike to 4-leaf. Do not apply to non-ir corn treated with Counter insecticide. Add COC or NIS, and amm. sulfate. Apply to small weeds and corn not more than 12" tall. Do not apply to non-ir corn treated with Counter. Add COC and amm. sulfate. Apply to corn 4-20" tall. Application may be split by applying 0.38 oz early and another 0.38 oz with drop nozzles when corn is from 20" tall to before tassel. Do not apply to non-ir corn treated with Counter. Apply from corn emergence to 4 leaf. Apply before weeds are 1.5" tall. May add NIS under warm, dry conditions when corn is not more than 2-leaf stage. Do not use petroleum based oils or MSO's. Apply to corn from emergence to prior to tassel. Apply to small broadleaves. Apply to corn up to 20" or 6-leaf. Apply to broadleaves less than 3" and grasses less than 4" tall. Add NIS and UAN. Do not apply to non-ir corn treated with

6 6 of 9 10/22/02 1:48 PM Counter. Celebrity Plus 75.3 (dicamba + diflufenzopyr + nicosulfuron) 4.7 oz Corn - 1 week; sorghum - 10 mos; soybeans - 4 ; wheat - 4 ; cotton - 10 Apply to corn 4-24" tall. Do not apply to non-ir corn treated with Counter. Do not apply more than 9.4 oz per season. Add NIS and UAN. Clarity 4L pt See Banvel. See Banvel. Distinct 70WG 4-6 oz Check with product representative. Exceed 57WG (prosulfuron + primisulfuron) Hornet 85.6WG (flumetsulam + clopyralid) Liberty 1.67SL (glufosinate) 1.0 oz Corn - 1 mo.; IMI corn - immediately; sorghum - 10 ; soybeans - 18 ; wheat - 3 ; cotton oz Corn - immediately; sorghum - 12 ; soybeans mos; wheat - 4 ; cotton oz Corn, soybeans - immediately; sorghum, wheat - 2 ; cotton - 3 Apply to 4-10" corn at the 6 oz rate and to 10-24" corn at the 4 oz rate. Will control broadleaves and has some grass activity. Not recommended for use in tank mixes with products that contain dicamba, 2,4-D, or clopyralid. Add NIS or amm. sulfate. Apply to corn between 4 and 30 inches. Do not make more than one application per season. If Counter or similar insecticide has been used, only corn hybrids with IMR or IR designation can be treated with Exceed. IT corn should be treated as a "normal" hybrid. Good broadleaf and partial grass control. Add COC. Apply to corn up to 20" tall and to broadleaf weeds under 8". Do not apply to IT or normal hybrids if Counter or similar herbicide has been used. IR or IMR hybrids are exempt from this. Do not apply more than 4.8 oz per season. Add NIS or COC. For use only on Liberty Link corn hybrids up to 24" in height or V7 stage. Must be applied with ammonium sulfate. Do not apply more than 62 oz per season. Volunteer Liberty Link corn will not be controlled by an application of Liberty.

7 7 of 9 10/22/02 1:48 PM Liberty ATZ 4.3SC (glufosinate oz Do not rotate to any crop except corn or sorghum until the following year. Rotations will be dependent upon amount of atrazine applied. For use only on Liberty Link corn hybrids from emergence to 12" in height. Do not apply more than one treatment per season. Must be applied with amm. sulfate. Lightning 70DG (imazethapyr + imazapyr) Marksman 3.2EC (dicamba + Northstar 51.4WDG (primisulfuron + dicamba) Permit 75WDG (halosulfuron) Poast 1.5L (sethoxydim) 1.28 oz Corn ; IMI corn - immediately; cotton, sorghum - 18 ; soybeans - 9 ; wheat Corn, sorghum - immediately; cotton - 18 ; soybeans - following year; wheat - 10 For use on IMI corn hybrids only. Apply before corn is 12" in height. Add a NIS as a surfactant along with either liquid UAN or amm. sulfate. Will control or suppress broadleaves and grasses. Apply to corn from emergence to 8" in height. For control or suppression of certain broadleaf weeds. May use NIS, COC, UAN, or amm. sulfate as an additive, especially on drought stressed weeds. 5 oz See Beacon. Apply over the top when corn is 4-20" in height or directed when corn is 20-36" in height. Do not apply to normal or IT corn if Counter insecticide has been used. IR or IMR corn is exempt from this. Use NIS or COC as an additive oz Corn - 1 mo.; IMI corn - immediately; sorghum, wheat - 2 ; cotton - 4 ; soybeans - 9 Can be applied to corn from spike through layby stage. Add either NIS or COC as an additive. Recommend addition of a tank mix for better control of broadleaves and grasses. Weak on pigweeds oz All crops - immediately. Apply only to Poast protected corn hybrids with a PP designation on the seed label. Applications may be made until the onset of pollen shed. Add NIS or COC for additives. Add UAN or AMS to control crabgrass or volunteer

8 8 of 9 10/22/02 1:48 PM Poast Plus 1.0L (sethoxydim) Pursuit 70DG (imazethapyr) Pursuit Plus 3.1EC (imazethapyr + pendimethalin) Resource 0.86EC (flumiclorac) Roundup Ultra 4L (glyphosate) Spirit 57WDG cereals. Will only control grassy weeds oz See Poast. See Poast oz Corn ; IMI corn - immediately; cotton, sorghum - 18 ; soybeans - immediately; wheat - 4 Apply only to IMI corn hybrids. If Pursuit is tank mixed with Accent on IT corn hybrids, do not use Counter. IR corn hybrids may be used, though. Add COC as an additive. 2.5 See Pursuit. See remarks for Pursuit. Do not incorporate if applied before crop planting. Add NIS as an additive. 4 oz All crops - after harvest. Do not apply to corn before the 2 leaf or after the 10 leaf stage. Add COC as an additive. For late treatment of velvetleaf, use drop nozzles with Resource at 4-10 oz oz All crops - immediately. For use on Roundup Ready corn hybrids only. Apply from corn emergence through V8 stage or 30". Addition of AMS will enhance weed control. 1 oz See Exceed. See Exceed. (prosulfuron + primisulfuron) Stinger 3L (clopyralid) Tough 3.75EC (pyridate) pt Cotton, soybeans - 18 ; corn, wheat - immediately; sorghum Apply to corn after emergence and up to 24" in height. Recommended for control of Canada thistle and certain other broadleaf weeds. Addition of adjuvants is usually not necessary. 1-2 All crops - 1 mo. Field corn is tolerant to Tough at all stages of development. NIS, COC, or liquid fertilizer may be used as an adjuvant. Will control certain broadleaf weeds when applied alone or can be tank-mixed to control grasses.

9 9 of 9 10/22/02 1:48 PM 2,4-D amine 4 2,4-D LV4 2,4-D LV pt 0.5 pt 0.33 pt Cotton - following year; corn - immediately; sorghum, wheat mo.; soybeans - check label. Apply over the top when corn is in 2-5 leaf stage. May apply with drops when corn is 8" tall up to 10 days prior to tasseling. Do not cultivate for 7-10 days following application as corn may be brittle.

VegNet Vol. 11, No. 5, March 17, 2004

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