1. 2013/2014: Wheat Weed Control Treated Untreated A. Stanley Culpepper
University of Georgia
Tifton, GA

2. Presentation Format 1. Broadleaf Control 2. Ryegrass Control
3. Preplant Control for No-Till

3. Broadleaf Weeds – In Crop
Wild radish, henbit, chickweed, primrose, swinecress
Great options exists, growers just need to be timely!!!!!

4. Broadleaf Weeds – In Crop
ALS Inhibition
Harmony Extra
Express
Peak
Finesse
Osprey
PowerFlex
Synthetic auxin
2,4-D
MCPA

5. Controlling Broadleaf Weeds
1. Harmony TS fb MCPA or 2,4-D
Most effective program
Least effective program

6. MCPA vs 2,4-D CROP RESPONSE: MCPA: 2 tiller to full tiller wheat
2,4-D: full tiller wheat
WEED RESPONSE:
Similar on small weeds; 2,4-D better on larger weeds. Both outstanding on radish.

7. USE MCPA AND BE TIMELY? MCPA vs 2,4-D CROP RESPONSE
MCPA: 2 tiller to full tiller wheat
2,4-D: full tiller wheat
WEED RESPONSE
Similar on small weeds; 2,4-D better on larger weeds. Both outstanding on radish.
USE MCPA AND BE TIMELY?

8. Controlling Broadleaf Weeds
1. Harmony TS fb MCPA or 2,4-D
2. Harmony TS + MCPA or 2,4-D
Most effective program
Least effective program

9. Controlling Broadleaf Weeds
1. Harmony fb MCPA or 2,4-D
2. Harmony TS + MCPA or 2,4-D
3. 2,4-D alone
4. MCPA alone
5. Harmony Extra alone
Most effective program
Least effective program

10. Controlling Broadleaf Weeds
1. Harmony fb MCPA or 2,4-D
2. Harmony TS + MCPA or 2,4-D
3. 2,4-D alone
4. MCPA alone
5. Harmony Extra alone
Most effective program
Least effective program

11. Ryegrass Control in Wheat
ACY
1. A genetic stud– will develop resistance to ALL herbicides more quickly than any other known plant.
2. Extremely competitive with grain production.
3. Great options available ……….
Again, our concern with Hoelon in much of NC, especially in the Piedmont, is resistance.

12. IF YOU DON’T HAVE RESISTANCE
Ryegrass Control in Wheat
ACY
1. A genetic stud– will develop resistance to ALL herbicides more quickly than any other known plant
2. Extremely competitive with grain production.
3. Great options available ……….
Again, our concern with Hoelon in much of NC, especially in the Piedmont, is resistance.
IF YOU DON’T HAVE RESISTANCE

13. Annual Ryegrass – In Crop
ACCase Inhibition
Holeon
Axial
ALS Inhibition
Osprey
PowerFlex
PSII and VLCFA
Axiom
Inhibit Microtubule
Prowl

14. Annual Ryegrass – In Crop
ACCase Inhibition
Holeon
Axial
ALS Inhibition
Osprey
PowerFlex
PSII and VLCFA
Axiom
Inhibit Microtubule
Prowl

15. Resistance management:
Ryegrass Control in Wheat
Resistance management:
Axial and Hoelon have same mode of action. Treat a field only once every two years with either.
Osprey and PowerFlex have same mode of action. Treat a field only once every two years with either.
Timeliness is critical
ACY
Again, our concern with Hoelon in much of NC, especially in the Piedmont, is resistance.

16. Proper Timing of POST Materials Timeliness is critical !!!
With normal planting date, generally
best to apply before Christmas
ACY

17. Non-treated control
Hoelon 2X rate

18. PowerFlex 3X rate or Osprey at 3X rate
Non-treated control
PowerFlex 3X rate or Osprey at 3X rate

19. Non-treated control
Axial XL 2X rate

20. Non-treated control
Was A Future Product

21. Ryegrass Resistant to ALL POST’S
Rotate out of grains and grow a crop allowing tillage and Roundup!
Efforts underway to understand impacts of deep turning.
Couple of products may help but are not a solution!

22. Prowl H20 Labeled For Wheat
FAIR residual control of ryegrass
Must apply to wheat from 1st leaf stage until before flag leaf.
May mix with any currently labeled wheat herbicide.
Will help on resistance a little!!!!

23. Axiom Labeled For Wheat
Spike application to wheat (pray the ryegrass is not up before product is activated)
Generally 6 to 8 oz/A
Excellent broadleaf control
Ryegrass control is either good or very poor depending on when it emerges
Only option for some growers due to resistance
Injury can be significant if very heavy rains and cold conditions occur after application
Will help on resistance!!!!

24. Zidua: Game Changer??? Labeled next season.
PRE: Outstanding ryegrass control; injury concerns?
Spike: Fair ryegrass control; great crop safety!
Should be economical for wheat producers.
Resistance likely if used 3 years in a row on same heavily infested field. Must rotate away from Zidua every other year.
Excellent resistant management tool when rotated with POST ryegrass materials!!

25. No-Till Production Clean at Planting: Roundup: 0 d plantback
Gramoxone: 0 d plantback
Harmony: 0 d plantback
2,4-D: 24 d + 1 inch rain plantback
Valor: 30 d + 1 inch rain plantback
Select: 30 d plantback

26. No-Till Production 1. ZERO EMERGED RYEGRASS AT PLANTING:
Roundup full rate 7 to 10 d prior to plant followed by Gramoxone at planting

27. No-Till Production 1. ZERO EMERGED RYEGRASS AT PLANTING:
Roundup full rate 7 to 10 d prior to plant followed by Gramoxone at planting
2. 2,4-D For Burndown: At least 24 days and no less than 1 inch of rain

28. No-Till Production 1. ZERO EMERGED RYEGRASS AT PLANTING:
Roundup full rate 7 to 10 d prior to plant followed by Gramoxone at planting
2. 2,4-D For Burndown: At least 24 days and no less than 1 inch of rain
3. Corn: Select 30 day plant back or beat on it with Gramoxone