Weed Control Updates--March 2018
The UTcrops News Blog site has posts made on Feb. 27, 2018 that provide updates for burndown herbicide options for horseweed and weed control in wheat.
An article titled “Update on Herbicide Options for Horseweed Control in Burndown Applications” by Drake Copeland gives the following updates.
• Sharpen (MOA Group 14) or a premix of Sharpen and Outlook (MOA Group 15) or Verdict (MOA Groups 14+15) have been the most utilized and effective burndown options for horseweed in the past.
• For Xtend soybeans, the use of Engenia or XtendiMax closer to planting than the standard 21 days required following Clarity application is now an option.
• Elevore (new active ingredient of halauxifen-methyl–MOA Group 4) can be used as a burndown prior to soybean planting. The plantback interval is 14 days. It has proven effective for control of horseweed that is up to 8 inches tall.
• Tank mixes of dicamba (MOA Group 4) + Sharpen or Verdict (MOA Groups 14+15), Sharpen + Elevore, or Elevore + FirstRate (MOA Group 2) or Surveil (MOA Groups 2+14) are recommended for resistance management and to lessen regrowth potential of horseweed.
An article titled “New Herbicide Options for Broadleaf Weed Control in Wheat” by Larry Steckel provides the following information about two newly-labeled herbicides for broadleaf weed control in wheat.
• Quelex (MOA Groups 2+4) is a new herbicide that can be applied to wheat in either the fall or spring. It is a premix of a new active ingredient halauxifen-methyl (MOA Group 4) with the ALS-inhibiting herbicide florasulam (MOA Group 2). It has proven effective against ALS-resistant chickweed, horseweed, henbit, and other broadleaf winter annuals. See “2018 Weed Control Manual for Tennessee”, p. 55, for a list of weed control ratings for Quelex when applied to wheat.
• Fierce herbicide (MOA Groups 14+15) is a premix of Valor and Zidua herbicides that has been newly-labeled for delayed PRE application to wheat (spike to 2-leaf stage) in the fall. Wheat planting depth and Fierce application rate are critical to avoid wheat injury.
Remember the following points regarding the use of the above and all other herbicides.
• Labels for specific herbicides can be found on the CDMS label database site.
• Always consider MOA when using herbicides, and always ensure that herbicides that are used have MOA’s or multiple MOA’s that will prevent or manage resistance development in targeted weeds.
Composed by Larry G. Heatherly, Mar. 2018, larryheatherly@bellsouth.net