Wild Carrot
Wild carrot (also called Queen Anne's lace) is a biennial weed that is
becoming more of a problem in continuous no-tillage cropping systems.
Infestations often first appear at the borders of fields and the seed is
spread throughout the field by the combine during corn and soybean
harvest. It can be distinguished by its finely divided or lacy leaf
shape, a white flower head, and its carrot-like odor. Wild carrot
spreads by seed. The ultimate goal of controlling wild carrot,
regardless of the method, should be to prevent seed production. A dense
population of wild carrot can cause severe yield losses in corn and
soybeans. Some wild carrot populations in Ohio are resistant to 2,4-D.
Wheat Stubble. Mow the wheat stubble before early August. Apply
glyphosate (1.1 to 1.5 lbs ae/A) or glyphosate + 2,4-D (0.75 lb ae/A +
0.5 lb ai/A) in early October. This fall application is targeted at the
plants that will flower and produce seed the following year.
All Crops. Glyphosate can be used as a preplant treatment in corn
and soybeans, although wild carrot control has been variable. For best
results, apply glyphosate + 2,4-D (0.75 to 1.5 lbs ae/A + 0.5 lb ai/A)
as an early preplant treatment shortly after the plants begin to green
up. For wild carrot populations not resistant to 2,4-D, preplant
application of 2,4-D ester (1 quart/A) will provide fair control.
Tillage is the most effective tool for control of wild carrot in the
spring.
Corn. The most effective control of wild carrot is obtained with
postemergence corn herbicides. Apply atrazine (2 pounds active
ingredient/A), Spirit (1 ounce/A), Beacon (3/4 ounce/A), NorthStar,
Permit (1 to 1.3 ounces/A), Yukon, or Accent (2/3 ounce/A) postemergence
with a crop oil concentrate or methylated seed oil. The addition of 28%
nitrogen may increase effectiveness. Any postemergence treatment
containing at least 1.5 pounds active ingredient/A of atrazine will
provide fair to good control. Glyphosate (0.75 lb ae/A - Roundup Ready
corn) will suppress or control wild carrot.
Soybeans. For the most effective season-long control, apply
Classic (2/3 to 3/4 ounce/A) or Synchrony STS (1/2 ounce/A)
postemergence. The higher Classic rate provides more effective control.
Use crop oil concentrate or methylated seed oil with either treatment to
maximize control. Glyphosate (> 0.94 lb ae/A - Roundup Ready soybeans)
will suppress or control wild carrot. Preplant application of Canopy XL
will suppress wild carrot, especially when mixed with 2,4-D ester (if
the wild carrot population is not resistant to 2,4-D).
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