The Latest

Events

  1. Texas: Feed-Grain Marketing Workshop, Amarillo, Feb. 10-11

    February 10 @ 8:00 am - March 11 @ 5:00 pm
  2. Georgia: Ag Business Planning Workshop, Glennville, Feb. 11, 18

    February 11 @ 8:00 am - February 18 @ 5:00 pm
  3. Ohio: Agronomy Workshops, Wooster, Feb. 15, 16

    February 15 @ 8:00 am - February 16 @ 8:00 am
  4. Louisiana: Irrigation Management Workshop, Marksville, Feb. 16-17

    February 16 @ 8:00 am - February 17 @ 8:00 am
  5. Tennessee: Irrigation Meeting, Somerville, Feb. 16

    February 16 @ 8:00 am - 5:00 pm
  6. Tennessee: Cotton Focus Meeting, Jackson, Feb. 18

    February 18 @ 8:00 am - 5:00 pm
  7. Illinois: Ag Tech Innovation Summit, Champaign, Feb. 18

    February 18 @ 8:00 am - 5:00 pm
  8. Texas: Oil, Gas Leasing Workshop, College Station, Feb. 22

    February 22 @ 8:00 am - 5:00 pm
  9. Georgia: Required Classroom Trainings for Auxin Herbicide Tolerant Crops

    February 22 @ 8:00 am - March 1 @ 5:00 pm
  10. Arkansas: 6 Spray Clinics in Feb, March

    February 23 @ 8:00 am - March 10 @ 5:00 pm
  11. Texas: Wild Pig Management Workshop, Burnet, Feb. 24

    February 24 @ 8:00 am - 5:00 pm
  12. Mississippi: Ag Waste Disposal Day, Charleston, Feb. 24

    February 24 @ 8:00 am - 5:00 pm
  13. Virginia: USDA Agricultural Outlook Forum, Arlington, Feb. 25-26

    February 25 @ 8:00 am - February 26 @ 5:00 pm
  14. Georgia: Pest Manager Training, Forsyth, Feb. 25

    February 25 @ 8:00 am - 5:00 pm
  15. Tennessee: Winter Row Crop Marketing Meeting, Mason, Feb. 25

    February 25 @ 8:00 am - 5:00 pm
  16. Louisiana: Rice Producer Meeting, Crowley, Feb. 26

    February 26 @ 8:00 am - 5:00 pm
  17. Texas: Rice Technical Working Group, Galveston, March 1-4

    March 1 @ 8:00 am - March 4 @ 8:00 am
  18. Texas: Rice Technical Working Group Conference, Galveston, March 1-4

    March 1 @ 8:00 am - March 4 @ 5:00 pm
  19. Texas: Permian Basin Cotton Conference, Big Spring, March 1

    March 1 @ 8:00 am - 5:00 pm
  20. Kentucky: IPM Training, Princeton, March 2

    March 2 @ 8:00 am - 5:00 pm
  21. Texas: Regional Sorghum Program, Plainview, March 3

    March 3 @ 8:00 am - 5:00 pm
  22. Indiana Small Farm Conference, Danville, March 4-5

    March 4 @ 8:00 am - March 5 @ 5:00 pm
  23. Kansas: 103rd Annual Cattlemen’s Day, Manhattan, March 4

    March 4 @ 8:00 am - 5:00 pm
  24. Kentucky: Integrated Pest Management Training, Princeton, March 2

    March 6 @ 8:00 am
  25. Oklahoma: Irrigation Conference, Woodward, March 8

    March 8 @ 8:00 am - 5:00 pm
  26. Oklahoma: Pecan Management Course, Stillwater, March 8

    March 8 @ 8:00 am - 5:00 pm
  27. Georgia: Pest Manager Training, Gainesville, March 10

    March 10 @ 8:00 am - 5:00 pm
  28. Missouri: Free Pesticide Collection Event, Portageville, March 12

    March 12 @ 8:00 am - 5:00 pm
  29. Florida: Carinata Summit, Quincy, March 15-16

    March 15 @ 8:00 am - March 16 @ 5:00 pm

 

AgFax Media. LLC

142 Westlake Drive Brandon, MS 39047

601-992-9488 Office

Owen Taylor Debra L. Ferguson Laurie Courtney

      

Circulation Questions?

Contact Laurie Courtney

 

Georgia Cotton: Liberty Control Of Pigweed Depends On Time Of Day

Owen Taylor
By A. Stanley Culpepper, Extension Weed Scientist, University of Georgia June 8, 2012

Georgia Cotton: Liberty Control Of Pigweed Depends On Time Of Day

During winter meetings, Georgia growers were presented research results showing how the time of day influenced Liberty (Ignite) activity on Palmer amaranth during 2011 (Figure 1). Control ranged from 8 to 97% in response to the time of day in which applications were made.

Control from applications made around 12:30 am and 6:45 am provided 8 and 50% control, respectively. In contrast, mid-day or late afternoon applications provided excellent control (97-99% control).

Additional studies are in progress to better understand this interesting time of day impact on Liberty.

Figure 2 shows the level of Palmer amaranth control from a single Liberty application made from one hour before sunrise up through 6 hours after sunrise; results suggest applications should not be made until at least one hour after sunrise.

Figure 3 shows the level of Palmer amaranth control from Liberty applications made 6 hours before sunset through 1 hour after sunset. Control with afternoon/evening applications were more stable when compared to morning applications but the data does suggest less control may be achieved as the sun sets.

Applications of Liberty to Liberty Link cotton pose no significant injury risk regardless of the time in which applications are made. However, response of Widestrike cotton is more complex (Figure 4).

As expected, Widestrike cotton injury from Liberty applied alone is greatest during mid-day applications (similar to Palmer control).  It is important to note, the addition of Dual Magnum or Warrant with Liberty would increase the level of injury noted regardless of the time of day applications are made BUT the greatest level of injury would now most likely be observed with early morning applications to cotton covered in heavy dew when followed by a hot sunny day.

Just as a reminder, we do not recommend or suggest applications of Liberty be made to any cotton other than that containing Liberty Link technology.

There has been a significant push to include ammonium sulfate (AMS) with Liberty. So far, research has shown the impact from AMS (regular spray grade) to Liberty often causes:

Reduced Palmer control with early morning sprays.

Minimal to no benefit of Palmer control with sprays during other times of the day.

Potential to increase the level of cotton injury regardless of application timing. Therefore, we strongly encourage growers do not use AMS for in-crop applications of Liberty.

These 2012 research efforts are currently being conducted at 2 GA locations as well as a location in Tennessee, North Carolina and Louisiana. The early results from the Tennessee location (Larry Steckel) are similar to our results. By this winter, we should have a very good understanding on how time of day influences control of Palmer amaranth by Liberty across the Southeast and Mid-South.

Owen Taylor
By A. Stanley Culpepper, Extension Weed Scientist, University of Georgia June 8, 2012