Slide Presentation

TITLE    (click title to view slides)

AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

DOWNLOAD PRESENTATION    (right click and select 'Save Target As...')

TABLE OF CONTENTS
  1. 2017 Field Corn Weed Management Update
  2. Field Corn Yield Loss (%) Caused by Uncontrolled Weeds in Georgia Weed Science Research Trials (2007-2016)
  3. Timing of Herbicide Application- DAP or GDD?
  4. Later POST Applications?
  5. Atrazine + Any of these works just fine!
  6. Weed Control in Field Corn - 2016
  7. Weed Control in Field Corn - 2016
  8. Weed Control in Field Corn - 2016
  9. Anthem, Dual, Warrant, Zidua????
  10. Palmer Amaranth Control with Zidua, Dual Magnum, and Warrant Applied PRE to Bare-Ground - 2016
  11. PRE Zidua or Dual on Texas Panicum
  12. Zidua on Texas Millet?
  13. Evik or Not?
  14. What can you use in field corn if you have resistance to glyphosate, atrazine, and/or ALS herbicides?
  15. Weed Control in Field Corn Without Atrazine or Glyphsoate
  16. Field Corn Injury - Status
  17. Revulin Q
  18. Weed Control with Revulin Q - 2016
  19. Something to think about?
  20. Herbicides and High Yield Corn
  21. Herbicide Effects on Field Corn Yield in a High Input Environment
  22. Roundup P-Max (32 oz/A) + Atrazine (48 oz/A) + AMS Xtra (2.5% v/v) Timing Effects on Field Corn Yield in a High Input Environment - YEAR 3
  23. Pay Closer Attention to Hybrid/Herbicide Mgt. Guidelines
  24. ALS-Sensitive Field Corn Hybrids
  25. Can ALS herbicide formulations that contain a crop safener (isoxadifen) be used on ALS sensitive corn hybrids?
  26. ALS-Sensitive Field Corn Yield as Influenced by POST Herbicide Treatment in Georgia (2014-2015)**
  27. What happens when you spray Liberty on a non-LL corn hybrid?
  28. Roundup + Atrazine + AMS + MgSO4
  29. Question/Comments



SLIDE CONTENTS
  1. Eric P. Prostko Professor/Extension Weed Specialist Dept. Crop & Soil Sciences 2017 Field Corn Weed Management Update
  2. Figure 1. Field Corn Yield Loss (%) Caused by Uncontrolled Weeds in Georgia Weed Science Research Trials (2007-2016). Treated vs. Non-treated 225 * 0.38 * 4.00 = $342/A
  3. Timing of Herbicide Application DAP or GDD? *Assumes crop emergence on March 25 (5 DAP) V1.8 V2.7
  4. Later POST Applications? V6 stage all leaves are initiated Ear shoot initiation Kernel rows/ear begins Tassel initiation Growing point above soil surface ~500 GDD
  5. Atrazine + Any of these works just fine!
  6. Weed Control in Field Corn - 2016 CN-01B-16 May 4 44 DAP NTC Dual II Magnum 7.62EC @ 16 oz/A (PRE) Roundup P-Max 5.5SL @ 32 oz/A (29 DAP) Atrazine 4L @ 64 oz/A (29 DAP) 165 Bu/A (4 rep avg.) 220 Bu/A (4 rep avg.)
  7. Weed Control in Field Corn - 2016 CN-01B-16 May 4 44 DAP NTC Dual II Magnum 7.62EC @ 16 oz/A (PRE) Laudis 3.5SC @ 3 oz/A (29 DAP) Atrazine 4L @ 64 oz/A (29 DAP) MSO @ 1% v/v (29 DAP) 165 Bu/A (4 rep avg.) 249 Bu/A (4 rep avg.)
  8. Weed Control in Field Corn - 2016 CN-01-16 May 16 35 DAP NTC Dual II Magnum 7.62EC @ 16 oz/A (PRE) Halex GT 4.39SC @ 58 oz/A (21 DAP) Atrazine 4L @ 32 oz/A (21 DAP) COC @ 1% v/v (21 DAP)
  9. Anthem, Dual, Warrant, Zidua????
  10. Palmer Amaranth Control with Zidua, Dual Magnum, and Warrant Applied PRE to Bare-Ground - 2016 Time (DAT) Control (%) NC-01-16
  11. PRE Zidua or Dual on Texas Panicum Zidua 85WG @ 1.5 oz/A Dual II Magnum 7.62EC – 21 oz/A CN-10-16 May 16 35 DAT
  12. Zidua on Texas Millet? CN-10-16 May 16 Zidua 85WG @ 1.5 oz/A – PRE Photo 35 DAT Plot# 316
  13. Evik or Not? CN-01-16 July 7 108 DAP NTC Atrazine 4L @ 32 oz/A (PRE) Roundup P-Max 5.5SL @ 32 oz/A (POST) Atrazine 4L @ 48 oz/A (POST) Atrazine 4L @ 32 oz/A (PRE) Roundup P-Max 5.5SL @ 32 oz/A (POST) Atrazine 4L @ 48 oz/A (POST) Evik 80DG @ 2 lbs/A (PDIR) NIS @ 0.25% v/v (PDIR)
  14. What can you use in field corn if you have resistance to glyphosate, atrazine, and/or ALS herbicides? Residuals Zidua Dual Magnum Warrant Postemergence* Liberty Status Revulin Q Impact/Armezon Laudis Capreno Halex GT 2,4-D * double-crop soybean rotations?
  15. Weed Control in Field Corn Without Atrazine or Glyphsoate CN-10-16 June 3 53 DAP NTC Dual II Magnum 7.64EC @ 21 oz/A (PRE) Laudis 3.5SC @ 3 oz/A (POST) COC @ 1% v/v (POST) AMS Xtra @ 2.5% v/v (POST) Warrant 3ME @ 48 oz/A (PRE) Impact 2.8L @ 1.0 oz/A (POST) COC @ 1% v/v (POST) AMS Xtra @ 2.5% v/v (POST)
  16. Field Corn Injury - Status Status dicamba-NA + diflufenzopyr + isoxadifen CN-04-16 Agrigold 6659 7 DAT (April 25, 2016) Roundup P-Max @ 32 oz/A + Status @ 5 oz/A
  17. Revulin Q DuPont Accent + Callisto + isoxadifen (safener) MOA = 2 + 27 EPOST (20” tall or V6) 3.4-4.0 oz/A Tank mix with atrazine Cotton or soybean = 10 months; peanut = 18 months; small grains = 4 months No Counter INFR
  18. Weed Control with Revulin Q - 2016 CN-09-16 June 3 53 DAP NTC Revulin Q 51.2WG @ 3.4 oz/A Atrazine 4L @ 64 oz/A COC @ 1% v/v AMS Xtra @ 2.5% v/v Applied 17 DAP
  19. Something to think about? Some GA growers are pushing yield limits (250+ Bu/A) 75%-80% irrigated At lower yield/input levels, are herbicide stresses masked by other stresses? At higher yield/input levels (i.e. most stresses are controlled), what about herbicides?
  20. Herbicides and High Yield Corn After 3 years of testing under weed-free condtions…….. various herbicides applied at recommended time (V2-V5) did not reduce corn yields. glyphosate + atrazine applied from V2 to V8 did not reduce corn yields.
  21. Herbicide Effects on Field Corn Yield in a High Input Environment (RU = Roundup W-Max, ATZ = Atrazine, PW = Prowl, LIB = Liberty, STDQ = Steadfast Q, CAP = Capreno, LAD = Laudis, HGT = Halex GT, SAN = Sandea) – Average of 3 years (2014 + 2015 + 2016) Applied 17 -27 DAP ~V2-V5 STAGE (178-337 GDD) Weed-free Dowdy Farms (Brooks Co.) BC A ABC C C AB C C Pairwise t-tests: LS Means P= 0.10
  22. Roundup P-Max (32 oz/A) + Atrazine (48 oz/A) + AMS Xtra (2.5% v/v) Timing Effects on Field Corn Yield in a High Input Environment – YEAR 3 CN-05-16 Agrigold 6659 P = 0.5029 CV = 7.57
  23. Pay Closer Attention to Hybrid/Herbicide Mgt. Guidelines
  24. ALS-Sensitive Field Corn Hybrids Dekalb WARNINGS DKC 62-05 DKC 62-06 DKC 62-08 DKC 63-44 DKC 63-47 DKC 63-55 DKC 64-69 CAUTIONS 65-17, 65-18, 65-20 70-01, 70-03 RX940, RX940RR2 Pioneer WARNINGS P1324HR P1360 P1360AM P1360CHR P1360HR P1739R P1739YR CAUTIONS P1637R, P1637VYHR, P1637YHR P1690,P1690HR, P1690R P2088R, P2089YHR
  25. Can ALS herbicide formulations that contain a crop safener (isoxadifen) be used on ALS sensitive corn hybrids? Steadfast Q = nicosulfuron + rimsulfuron + isoxadifen Resolve Q = rimsulfuron + thifensulfuron + isoxadifen Realm Q = mesotrione + rimsulfuron + isoxadifen Accent Q = nicosulfuron + isoxadifen Revulin Q = mesotrione + nicosulfuron + isoxadifen Capreno = tembotrione + thiencarbazone + isoxadifen
  26. ALS-Sensitive Field Corn Yield as Influenced by POST Herbicide Treatment in Georgia (2014-2015)** **Averaged over 2 years (2014-2015) and 2 corn hybrids (DKC 64-69 and DKC 62-08) Al treatments also included atrazine @ 2 lb ai/A + COC @ 1% v/v. Weed-free A ABC AB BC C BC C a= 0.10
  27. What happens when you spray Liberty on a non-LL corn hybrid? CN-01B-16 DKC 66-59 Liberty @ 29 oz/A + Atrazine @ 48 oz/A 6 DAT (April 25, 2016) Still made 28 Bu/A!!!!!
  28. Roundup + Atrazine + AMS + MgSO4 NTC Roundup P-MAX 5.5SL @ 22 oz/A Atrazine 4L @ 64 oz/A AMS Xtra @ 2.5% v/v Roundup P-MAX 5.5SL @ 22 oz/A Atrazine 4L @ 64 oz/A AMS Xtra @ 2.5% v/v MgSO4 @ 4 lb/A CN-13-16 May 4, 2016 14 DAT
  29. Question/Comments