Cotton preplant burndown and incorporated options
The following describes an assortment of options to aid cotton growers in weed management. These comments were prepared by Drs. Peter Dotray and Wayne Keeling, Texas A&M AgriLife Extension and Texas A&M AgriLife Research.
Preplant Burndown Options
One of the initial “keys” to effective, season-long weed management is to start clean. In conventional tillage, normal land preparation practices and herbicide incorporation, followed by a rodweeder prior to planting should provide a clean start for uniform crop emergence and allow the crop to “get a head start” on the weeds. For growers in some type of reduced or no-tillage system, the use of tillage is replaced by burn down herbicides prior to or at planting. In this semiarid region, there are plant back restrictions to be aware of to avoid crop damage after planting. Below are a number of herbicide options labeled for preplant weed control.
Roundup (glyphosate) is a Group 9 herbicide based on the mode of action classification system of the Weed Science Society of America. The following information was obtained from the Roundup PowerMax label .
Use Instructions. This product may be applied before, during or after planting cotton, but prior to crop emergence (unless it’s a Roundup Ready or Glytol cotton variety).
Tank Mixtures. This product may be tank-mixed with 2,4-D, Valor, and FirstShot prior to planting (see restrictions on the 2,4-D, Valor, and FirstShot label). This product may also be tank-mixed with several herbicides and applied prior to emergence (see preemergence section) or postemergence (see postemergence section). Normal use rates of this product are 22 to 32 ounces.
Allow at least 1 to 2 weeks from application before any tillage operation is used to ensure adequate uptake and translocation.
2,4-D (a group 4 herbicide). Specific time, rate, and irrigation restrictions are essentially impossible to find on 2,4-D labels. In general, applications made prior to March 1 with any moisture accumulation (0.5 inches) should be enough to effectively dissipate the herbicide prior to planting. According to the Weed Management in Texas Cotton guide (ESC-008, 3/14), wait a minimum of 30 days following the application and a minimum of 1 inch rainfall or irrigation within a 24 hr period.
A “normal use rate” of 2,4-D formulated at 4 pounds per gallon is 1 to 2 pints per acre. 2,4-D + glyphosate is an effective preplant burndown treatment to control winter weeds such as mustard, shepherdspurse, henbit, and horseweed, and early emerging summer annuals such as kochia and Russian thistle.
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