1 / 72

2001 Cotton Production Workshop

2001 Cotton Production Workshop. Waiting until spring to control weeds. glyphosate or paraquat PLUS Aim, Caparol, Clarity, Direx, Harmony Extra, Goal, Resource, Valor, and 2,4-D. 100. 80. Gly alone. 60. Gly + 1 pt. 40. 2,4-D. 20. 0.

azana
Download Presentation

2001 Cotton Production Workshop

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 2001 Cotton Production Workshop

  2. Waiting until spring to control weeds glyphosate or paraquat PLUS Aim, Caparol, Clarity, Direx, Harmony Extra, Goal, Resource, Valor, and 2,4-D

  3. 100 80 Gly alone 60 Gly + 1 pt 40 2,4-D 20 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. GA & NC data. 96 % control, 30-40 days 58 Average of 12 trials, 1999-2001.

  4. 14 days after treatment 28 days after treatment Roundup UltraMax 1.6 pt

  5. 100 Gly alone 80 60 Gly + 1/2 oz Harmony Extra 40 Gly + 1 pt 20 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. GA & NC data. 96 % control, 30-40 days 63 58 Average of 12 trials, 1999-2001.

  6. 100 Gly alone 80 60 Gly + 2-3 oz Resource 40 Gly + 1 pt 20 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. GA & NC data. 97 63 % control, 30-40 days 50 Average of 4 trials, 1999-2001.

  7. 100 Gly alone 80 60 Gly + 1 oz Valor 40 Gly + 1 pt 20 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. GA data. 97 80 % control, 30-40 days 47 Average of 1 trials, 2001.

  8. Valor for Burndown • flumioxazin • change from WDG to WP • 1 to 2 oz/A mixed with glyphosate • much quicker burndown • residual activity if contacts soil (good for pusley) • enhanced geranium, radish, and primrose control

  9. 100 Gly alone 80 60 Gly + 2 oz Valor 40 Gly + 1 pt 20 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. GA & NC data. 97 84 % control, 30-40 days 63 Average of 8 trials, 1999-2001.

  10. 14 days after treatment 28 days after treatment Roundup UltraMax 1.6 pt + Valor 1 oz

  11. Gly alone 100 80 Gly + 1 pt 60 Goal 40 20 Gly + 1 pt 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. NC data. 98 74 65 % control, 30-40 days Average of 5 trials, 1999-2001.

  12. Gly alone 100 80 Gly + 1/2 pt 60 Clarity 40 20 Gly + 1 pt 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. NC data. 97 87 % control, 30-40 days 62 Average of 6 trials, 1999-2001.

  13. Gly alone 100 80 Gly + 2/3 oz 60 Aim 40 Gly + 1 pt 20 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. GA & NC data. 97 % control, 30-40 days 60 47 Average of 3 trials, 1999-2001.

  14. Gly alone 100 80 Gly + 1 pt 60 Direx 40 Gly + 1 pt 20 2,4-D 0 Glyphosate Tank Mixes on Cutleaf Eveningprimrose. GA data. 95 % control, 30-40 days 64 47 Average of 1 trials, 2001.

  15. 1 0.5 0 Relative Response of Cutleaf Eveningprimrose to Glyphosate Tank Mixes.* Harmony Extra Harmony GT 2,4-D Alone Resource Valor Clarity Aim Goal *Estimates based on GA and NC data from 1999 to 2001.

  16. Roundup + Direx Roundup On farm, Grady County, 2001.

  17. Wheat Response to Glyphosate Applied Alone and in Mixture with Caparol. Ponder Farm, 2001; 16 DAT. Roundup UltraMax (1.6 pt) + 1.5 pt Caparol

  18. Boa alone 100 + 1 oz Valor 80 + 2 oz Valor + 4 oz Resource 60 + 2/3 oz Aim 40 + 1 pt Direx 20 + 1 pt Caparol + 1 pt 2,4-D 0 + 1/2 oz Harmony Ex Paraquat Tank Mixes on Cutleaf Eveningprimrose. GA data. 96 70 71 71 68 % control, 30-40 days 59 55 54 46 Average of 1 trials, 2001. LSD = 13

  19. Summary - Cutleaf Eveningprimrose 1. 2,4-D, glyphosate + 2,4-D, paraquat + 2,4-D 2. glyphosate + Valor or Clarity 3. paraquat + Direx, Valor, Harmony Extra or glyphosate + Aim, Caparol, Direx

  20. Wild Radish

  21. Roundup UltraMax 100 + 1 oz Valor 80 + 2 oz Valor + 4 oz Resource 60 + 2/3 oz Aim 40 + 1 pt Direx + 1 pt Caparol 20 + 1 pt 2,4-D 0 + 1/2 oz Harmony Ext Tank Mixes with Glyphosate on Wild Radish. GA data, Tift County, 2001. 95 93 85 81 77 73 71 70 69 % control, 30-40 days LSD = 12

  22. Boa alone 100 + 1 oz Valor 80 + 2 oz Valor + 4 oz Resource 60 + 2/3 oz Aim 40 + 1 pt Direx 20 + 1 pt Caparol + 1 pt 2,4-D 0 + 1/2 oz Harmony Ext. Tank Mixes with Paraquat on Wild Radish. GA data, Tift County, 2001. 99 99 87 76 70 68 67 67 67 % control, 30-40 days LSD = 12

  23. Summary - Wild radish 1. glyphosate + 2,4-D, Harmony Extra paraquat + 2,4-D, Direx, Harmony Extra 2. glyphosate + Valor, Direx 3. glyphosate paraquat + Valor

  24. Plant Back Restriction for Burndown Herbicides • 2,4-D = preferably 45 days • Aim = nothing on label • Clarity = 21 d after 1” rainfall • Direx = 15 d prior to planting • Goal = 30 d or at least three 0.25” rainfalls • Harmony Extra = 45 d prior to planting • Valor = 30 d prior to planting

  25. 100 80 60 40 20 0 none 21 14 7 0 Cotton Injury to Valor Applied Less Than 30 Days Before Planting. TyTy, 2001 % cotton injury, 18 DAP days before planting *Irrigated at cotton emergence. No weeds present at time of application.

  26. Georgia Cotton - Cultivar Selection* • 86.9% transgenic; 12.1% conventional • 40.8% Roundup Ready • 41.5% stacked gene • 4.6% Bollgard *USDA Agricultural Marketing Service Survey, August 2001.

  27. The first 4 to 5 weeks of cotton development is the most critical.

  28. 1800 1500 1200 lb/A 900 600 300 0 1 OT 2 OT 1 OT 2 OT Effect of PRE Herbicides on RR Seedcotton Yield.1 No PRE Avg. 10 PRE’s 1600 a 1560 a 1560 a 1490 a 1420 a 1460 a 1070 b 635 b 1998 1999 1Study in 1998 conducted at Goldsboro, NC. Studies in 1999 conducted at Goldsboro, NC and Tifton, GA. Data pooled over both locations in 1999.

  29. How Important Is Early Season Weed Competition? Can one wait until 4-leaf stage of cotton to initiate weed control? Depends upon: Weed species Weed density Growing conditions

  30. How Important Is • Early Season Weed Competition? • About 33 to 66% of the time we can initiate weed control at the 3 to 4 leaf stage of cotton. • The other 33 to 66% of the time we need a soil- applied herbicide or 2 overtop RU applications. • If in doubt, apply DNA + Cotoran or Staple

  31. Weeds Difficult to Control by Glyphosate?

  32. Controlling Yellow and Purple Nutsedge? Nutsedge Control Programs: 1) 2 applications of glyphosate prior to 5th leaf followed by conventional chemistry including 2 lb ai MSMA directed 2) 1 application of glyphosate or Staple Plus prior to 5th leaf followed by 2 lb ai MSMA directed or glyphosate 3) Zorial or Staple?????

  33. No MSMA + MSMA 1.3 pt 100 75 50 25 0 1.5 2 Yellow Nutsedge Control by R’up/MSMA Mixtures. 2 Locs, 1999 -2000. 80 74 71 % control 65 Roundup Ultra (pt) *Control 30 DAT.

  34. Glyphosate 0.75 lb ae/A + MSMA 1.3 pt 30 days after treatment

  35. No MSMA + MSMA 1.3 pt 40 30 20 10 0 0 0.5 1 1.5 2 Cotton Injury 10 DAT with R’up/MSMA Mixtures. 2 Locs, 1999. 27 25 % injury * * 20 * 16 12 * * Roundup Ultra (pt) *Injury by tank mix significantly greater than Roundup applied alone

  36. Weeds Difficult to Control by Glyphosate?

  37. Mid-Season Morningglory Control by Glyphosate & Glyphosate/Staple Mixtures. Pitted Smallflower morningglory morningglory Loc 1 Loc 2 Loc 1 Glyphosate 73 55 89 Glyphosate + Staple 93 76 97 Things to consider? 1. Morningglory size at time of application (5+ inches here). 2. Will you post-direct with conventional chemistry or glyphosate?

  38. Roundup Ultra 1.5 pt + Staple 0.6 oz 24 days after treatment - Irrigated, Moultrie, 2000.

  39. + Staple 0.8 oz Roundup Original 1.5 pt 18 days after treatment - Irrigated, TyTy, 2001.

  40. Glyphosate/Staple Tank Mixtures • DuPont new label allows 0.8 oz of Staple to be applied in mixture with glyphosate.

  41. Controlling Extremely Large Morningglory

  42. Weeds Difficult to Control by Glyphosate?

  43. 100 80 60 40 20 0 Hemp Sesbania Control by Glyphosate. Tifton, 2000.* 86 % control 59 3 inches 7 inches *Roundup Ultra applied at 2 pt/A. Experiment conducted under center irrigation.

  44. Tropical spiderwort, Cairo, GA, 2001. Cooperative work with Tim Flanders

  45. Fairly common scene at harvest across the state

  46. Dual Magnum + Glyphosate Label • present label = • may be applied overtop of 3-12 inch cotton alone • may be directed in mixture with glyphosate in RR cotton but “do not allow spray solution to contact cotton leaves” • residual control for Amaranthus, grasses, tropical spiderwort

  47. glyphosate @ 4 lf + 1 pt Dual Magnum Attapulgus, 2001 *Irrigated within 48 hrs.

  48. 100 80 Palmer 60 T. panicum pusley 40 y. nutsedge 20 0 Weed Response to Touchdown (TD)/Dual Magnum Systems. Attapulgus, 2001. % control, late-season TD 1 lf TD 1 lf TD 1 lf TD 4 lf TD 4 lf TD + Dual Mag. 4 lf TD timely PD TD 11 d delay TD 11 d delay LSD ranged from 9 to 12

  49. Dual Magnum + Glyphosate Label • present label = • may be applied overtop of 3-12 inch cotton alone • may be directed in mixture with glyphosate in RR cotton but “do not allow spray solution to contact cotton leaves” • residual control for Amaranthus, annual grasses, tropical spiderwort • any concerns??????

  50. Roundup UltraMax Roundup UltraMax + 1 pt Dual Magnum POST

More Related