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

 

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California: Roundup Ready Alfalfa And Resistance

Owen Taylor
By Brad Hanson, Extension Weed Specialist, University of California - Davis January 5, 2013

California: Roundup Ready Alfalfa And Resistance

While working on articles for an upcoming volume of the California Weed Science Society Journal, I was reminded of a really nice UCANR publication Avoiding Weed Shifts and Weed Resistance in Roundup Ready Alfalfa Systems by S. Orloff, D. Putnam, M. Canevari, and T. Lanini.  You can find this publication (#8362) as well as hundreds (probably thousands) of others here.

Roundup Ready (glyphoate-tolerant) alfalfa was introduced in 200,5 but new plantings were stopped in early 2007 due to court challenges.  After another series of lawsuits, injunctions, decisions, etc., the decision of the Federal court was upheld in January 2012 and California growers could again plant Roundup Ready (RR) alfalfa.

alfalfa-roundup-ready-guide-cover-01052012Just like in other RR cropping systems, alfalfa growers have a new opportunity to selectively control weeds using a simple, reliable and effective strategy.  However, also just like other crop producers, alfalfa producers need to be aware of the potential for weed shifts and selection for herbicide resistant weeds in RR alfalfa.  The biggest risk for weed shifts and resistance will be if alfalfa growers use ONLY glyphosate-herbicides in these crops.

If alfalfa growers make the same mistake that soybean, cotton, and corn producers made and only use glyphosate, there will undoubtedly eventually be problems with resistance or shifts to tolerant species.  In the Orloff et al. publication, weed shifts away from annual bluegrass and shepherd’s purse to burning nettle and sowthistle were documented.

The authors recommended using other, conventional herbicides as part of an integrated weed management program in RR alfalfa.  I would emphasize that also and remind folks that RR technology should be used to EXPAND selective weed control choices NOT REPLACE all others; otherwise, a very useful weed management tool could have a very short useful lifespan.

Two very publications that I found very informative on this issue are:

Owen Taylor
By Brad Hanson, Extension Weed Specialist, University of California - Davis January 5, 2013