Slide Presentation

TITLE    (click title to view slides)
2009 Soybean Weed Management

AUTHOR
Eric P. Prostko
Extension Weed Specialist
Department of Soil and Crop Science
UGA

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TABLE OF CONTENTS
  1. Soybean Weed Control
  2. Conventional Soybean Weed Control -- Many Options
  3. Burndown Options for Reduced Tillage Soybean Production Systems
  4. U.S. Soybean Acres Planted to Herbicide Resistant Varieties
  5. RR Soybean Weed Control Systems -- Things to Think About
  6. Soybean growth stages
  7. Soybean
  8. To Prevent Yield Loss in RR Soybeans
  9. Tolerance of GR-Soybean to Late-Season Glyphosate Applications (1.5 lb ai/A)
  10. Soybean Yield As Influenced by Glyphosate Applied at R4 + R6 Stage
  11. Glyphosate + Fungicide Tank-Mixes -- Soybean Rust
  12. Glyphosate/Boron/Dimilin -- Tank Mixes
  13. Tropical Spiderwort (Benghal Dayflower)
  14. TSW in Georgia
  15. Tropical Spiderwort Management in RR Soybeans
  16. Tropical Spiderwort Control with Roundup WeatherMax in Soybean - 2004
  17. Tropical Spiderwort Control in RR Soybeans -- Tattnall County - 2005
  18. Controlling RR Cotton in RR Soybeans
  19. Controlling RR Corn in RR Soybeans
  20. Nutsedge Management in RR Soybeans
  21. Glyphosate/Manganese Tank-Mixes
  22. Glyphosate Resistance Around the World (15 species)
  23. GA counties confirmed to be infested with glyphosate-resistant Palmer amaranth
  24. GA Confirmed ALS-Resistant Palmer Sites
  25. Soybean Yield Losses Caused by Palmer Amaranth Plants When They Emerge with Crop
  26. Pigweed Control in Soybeans
  27. GR-Palmer Amaranth Control in Soybeans with PRE's (2008) - Macon Co.
  28. GR-Pigweed Control in Soybeans - 2008
  29. Metribuzin Products on Soybeans
  30. Crop Rotations for Metribuzin Products
  31. Soybean varieties screened in 2008 that had adequate tolerance to Boundary 6.5EC, Canopy 75DG, and Sencor 75DG
  32. GR-Palmer Amaranth Control in Soybeans with PRE's (2008) - Macon Co.
  33. GR-Palmer Amaranth Control in Soybeans with PRE's (2008) - Macon Co.
  34. This is what a 2" pigweed looks like!!!!
  35. Harmony GT XP or Harmony SG
  36. Harmony GT on Soybeans (Tift County - 2008)
  37. Harmony not Harmony Extra!!!!!
  38. STS® Soybeans
  39. Be careful when mixing!! Staple, Envoke, Cadre not a good idea!!!!
  40. Burning Wheat Stubble Good or Bad idea?
  41. Weed Control in Soybeans -- Sicklepod
  42. What’s in the pipeline?
  43. For More Weed Science Info



SLIDE CONTENTS
  1. Soybean Weed Control Eric P. Prostko Extension Weed Specialist Department of Soil & Crop Science The University of Georgia
  2. Conventional Soybean Weed Control Many Options Preemergence grasses – Treflan, Prowl, Dual/Generics, Intrro, Micro-Tech, Outlook, Command broadleaf – Boundary, Canopy, Sencor, Pursuit, Scepter, Lorox, Python, Valor, Reflex, Valor XLT , Envive, Prefix Postemergence grasses – Assure/Targa, Fusilade, Poast, Select/Arrow broadleaf – Ultra Blazer, Basagran, Cobra, Storm, Classic Rotation restrictions
  3. Burndown Options for Reduced Tillage Soybean Production Systems Primary Glyphosate Gramoxone Inteon/Firestorm/Parazone Ignite Tank-mixes 2,4-D (7-15 DBP) Aim (0 DBP) ET (0 DBP) Valor (0 DBP) Harmony Extra (14 DBP) Express (14 DBP) Clarity/Vision (14 DBP + 1” rainfall) Canopy EX (Classic + Express) 7-14 DBP DBP = days before planting
  4. U.S. Soybean Acres Planted to Herbicide Resistant Varieties Source: NASS
  5. RR Soybean Weed Control Systems Things to Think About glyphosate prices are increasing $33/gal (generic 4 lb/gal) $70/gal RUPM current price of RR soybean seed $44/50 lbs (retail) weed resistance issues
  6. R1 - first flower R2 - full bloom R3 - pod initiation R4 – full pod R5 – beginning seed R6 - Full seed
  8. To Prevent Yield Loss in RR Soybeans control weeds by 4-5 weeks after planting or control weeds before they reach 6-9” in height or control weeds before the V3 stage Source: Purdue University Extension Weed Science Group (5.4 million acres harvested in in 2008)
  9. Tolerance of GR-Soybean to Late-Season Glyphosate Applications (1.5 lb ai/A) J.K. Norsworthy. 2004. Weed Technology 18:454-457 LSD 0.05 = NS
  10. Soybean Yield As Influenced by Glyphosate Applied at R4 + R6 Stage Source: Miller et al., 2008. Weed Technology 22:359-362 THSD 0.05 = NS
  11. Glyphosate + Fungicide Tank-Mixes Soybean Rust What do labels say? timing concerns Glyphosate = V3 Fungicide = R1 or later limited information preliminary results from UGA research suggest no major problems more data is needed
  12. Glyphosate/Boron/Dimilin Tank Mixes full-bloom to early pod-fill R2-R3 stage Is this the best time for Roundup? (V3) Crop injury? No more than 0.25 to 0.5 lb/A of Boron
  13. Tropical Spiderwort (Benghal Dayflower)
  14. TSW in Georgia 2004: 29 counties (light blue) 2005: 5 counties (black) 2006: 6 counties (dark blue) 2007: 2 counties (yellow) 2008: 2 counties (red)
  15. Tropical Spiderwort Management in RR Soybeans timing is critical EPOST Sequence (3 pts/A) Glyphosate + Dual Magnum Extreme (3 pts/A) Glyphosate + Pursuit glyphosate + Classic or FirstRate
  16. Tropical Spiderwort Control with Roundup WeatherMax in Soybean - 2004 Ratings at 20-24 DAT Average of 2 tests Roundup WeatherMax @ 22 ozs/A
  17. Tropical Spiderwort Control in RR Soybeans Tattnall County - 2005 Untreated Sequence @ 3 pts/A Extreme @ 3 pts/A 33 DAT
  18. Controlling RR Cotton in RR Soybeans Preemergence Canopy 75DG (8 oz/A) Sencor 4L (8-12 oz/A) Sencor 75DF (5.3-8 oz/A) POST glyphosate tank-mixes 6” cotton, 3 leaves Resource (4 ozs/A) - 77% 2,4-DB (2 ozs/A) - 76% Reflex (12 ozs/A) - 72% Classic (0.33 ozs/A) - 62% PRE only = 54-87% POST only = 62-77% PRE + POST = > 95% Source: York et al., Weed Technology. 2004. 532-539.
  19. Controlling RR Corn in RR Soybeans tank-mix glyphosate with POST grass herbicide rate depends on height of corn Assure II (5-8 ozs/A) Fusilade (4-8 ozs/A) Select (4-8 ozs/A) SelectMax (8-12 ozs/A) Poast (12-16 ozs/A) Poast Plus (18-24 ozs/A) adjuvants
  20. Nutsedge Management in RR Soybeans preemergence Canopy, Envive, Reflex, Dual yellow nutsedge split applications of glyphosate better on purple than yellow glyphosate + Classic controls yellow suppresses purple glyphosate + Pursuit better on purple than yellow rotations/cost
  21. Glyphosate/Manganese Tank-Mixes depends upon type of Mn Mn-EDTA (yes) Mn-EAA (no) Mn-LS (no) MnS04 (no) Mn not a problem with Blazer, Classic, Pursuit, or Basagran. Sources: Bernards et al., 2005 (Weed Technology 19:27-34); Bailey et al., 2002 (Weed Technology 16:792-799); and Heckman et al., 1999 (Journal of Production Agriculture 12:445-448)
  22. Glyphosate Resistance Around the World (15 species) rigid ryegrass (1996)** goosegrass (1997) horseweed (2000)** Italian ryegrass (2001)** hairy fleabane (2003)** buckhorn plantain (2003) common ragweed (2004)** giant ragweed (2004)** Palmer amaranth (2005)** common waterhemp (2005)** johnsongrass (2005)** wild poinsettia (2005) sourgrass (2006) junglerice (2007) liverseedgrass (2008) ** 9/15 (60%) can be found in the US
  23. Georgia counties confirmed to be infested with glyphosate-resistant Palmer amaranth. 2004 – 1 county 2005 – 2 counties 2006 – 7 counties 2007 – 10 counties 2008 – screening in progress
  24. GA Confirmed ALS-Resistant Palmer Sites ALS Soybean Herbicides Classic, Scepter, Pursuit Python, Harmony, Synchrony
  25. Soybean Yield Losses Caused by Palmer Amaranth Plants When They Emerge with Crop Klingman and Oliver. 1994. Weed Sci. 42:523-527
  26. Pigweed Control in Soybeans use a residual herbicide Canopy, Boundary, Valor, Valor XLT, Prefix, Dual Magnum/Generics, Sencor, Prowl, Intrro, Treflan, Envive ALS or Glyphosate Resistance!!!! Spray POST herbicides early!!!!!!
  27. GR-Palmer Amaranth Control in Soybeans with PRE’s (2008) - Macon Co. NTC Canopy 75WG @ 6 oz/A SB-05-08 48 DAT
  28. GR-Pigweed Control in Soybeans - 2008 SB-06-08 Macon County 48 DAP NTC Canopy 75DG @ 6 oz/A + Prowl H2O 3.8ASC @ 2.1 pt/A (PRE)
  29. Metribuzin Products on Soybeans Sencor Boundary Dual Magnum + Sencor Canopy Sencor + Classic Read label Know soil texture and OM Varieties rotations
  30. Crop Rotations for Metribuzin Products
  31. Soybean varieties screened in 2008 that had adequate tolerance to Boundary 6.5EC (2 pt/A), Canopy 75DG (5 oz/A), and Sencor 75DG (6 oz/A). Ag South AGS 568 Asgrow H7242 Asgrow 4903 RR/STS Delta Pineland DP 5634 Delta Pineland DP 6568 Northrup King NKS 80P2 Northrup King NKS 76L9 Northrup King NKS 78G6 Pioneer 95Y40 Pioneer 95Y70 Pioneer 96M60 Pioneer 97M50 Southern States RT5951 Southern States RT4808 Vigoro V61N9 Vigoro V74N9
  32. GR-Palmer Amaranth Control in Soybeans with PRE’s (2008) - Macon Co. NTC Prefix 5.29EC @ 2 pt/A SB-05-08 48 DAT
  33. GR-Palmer Amaranth Control in Soybeans with PRE’s (2008) - Macon Co. NTC Envive 41.3WG @ 3 oz/A SB-05-08 48 DAT
  34. This is what a 2” pigweed looks like!!!!
  35. Harmony GT XP or Harmony SG Harmony GT XP (75%) GT = grass-tank mix XP = extruded pellet Harmony SG (50%) SG = soluble granules 1/8 oz/A 1st trifoliate until 60 days before harvest tank-mix with glyphosate ALS inhibitor up to 12” tall pigweed????? variable amounts of soybean injury
  36. Harmony GT on Soybeans (Tift County – 2008)
  37. Harmony not Harmony Extra!!!!!
  38. STS® Soybeans STS Sulfonylurea Tolerant Soybeans Non-GMO first introduced in 1993 Synchrony XP 21.5% Classic + 6.9% Harmony Non-STS POST Use Rate = 0.375 oz/A 0.32 oz/A Classic 25DG + 0.035 oz/A Harmony GT STS POST Use Rate = 0.75 oz/A 0.64 oz/A Classic 25DG + 0.07 oz/A Harmony GT 2007 UGA Soybean Variety Tests DP5115RR/S, DP5335RR/S
  39. Be careful when mixing!! Staple, Envoke, Cadre not a good idea!!!!
  40. Burning Wheat Stubble Good or Bad idea? probably not good if you need a residual herbicide for pigweed control Why?? may reduce the performance of residual herbicides 60% adsorption by ash
  41. Weed Control in Soybeans Sicklepod Conventional * Canopy or Sencor or Python fb Classic Roundup Ready
  42. What’s in the pipeline? Liberty-Link KIH-485 GAT Soybeans Dicamba, 2,4-D resistance
  43. For More Weed Science Info www.gaweed.com