Carrot, Wild (Daucus carota L.)

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Table of Contents

1. History
2. Life Cycle
3. Distinguishing Characteristics
4. Control in Corn
5. Control in Soybeans
6. Control in Winter Wheat

History

A member of the parsley family. Typically this has been a weed that grows in fencelines, roadsides and in waste areas. However, more recently it has been creeping into agricultural fields, particularly where no-till production systems are in place.

Life Cycle

Biennial or short-lived perennial, reproducing only be seed.

Distinguishing Characteristics

Finely divided leaves, hairy stem. When plant tissue is crushed it will exude a "carrot-like" odour. In the first year of its life cycle wild carrot will emerge with thin narrow cotyledons followed by finely divided leaves that eventually form a rosette. In the second year of growth the rosette bolts and wild carrot flowers. The flowers are white compound umbels..

Wild Carrot Pictures
Each thumbnail image links to a larger image

Herbicide Control in Field Corn

Post-Emergent Control in Corn

A number of the post-emergent herbicides provided good control of wild carrot with the exception of atrazine and Banvel II applied alone.

Table 1. Wild carrot control in corn using various post-emergent herbicides.

Source:
Dr. Peter Sikkema, University of Guelph.

Number of Trials:

Table 1 is based on 1 field trial in Ontario.

Herbicide Rates:
Rates used in this trial are listed in OMAF Publication 75 - Guide to Weed Control.

Weed Stage:
Wild carrot had between 1 to 20+ leaves (5-35 cm. in height) at the time of all post-emergent applications.

What has been your experience?
We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies.

Herbicide Control in Soybeans

Pre-plant control in Soybean

Pre-plant applications of glyphosate (2 L/ac) or glyphosate (1 L/ac) + BROADSTRIKE DUAL MAGNUM, CONQUEST or PURSUIT have provided over 80% control of wild carrot in soybean (Table 1).

Post-emergent control in Conventional Soybean

CLASSIC is the only post-emergent herbicide that provides over 80% control of wild carrot in conventional soybeans (Table 2).

Post-emergent control in "Roundup Ready" Soybean

A pre-plant application of glyphosate at 1L/ac followed by an in-crop application of glyphosate at 1 L/ac should supply good, cost effective control of wild carrot.

Have you experienced poor results with glyphosate?

Grower experience has shown that control of wild carrot with glyphosate can sometimes be inconsistent. One explanation for this may be the presence of different biotypes, some of which are more tolerant to glyphosate than others.

Low water volumes may assist in control.

It is well-documented that lower water volumes increase the effectiveness of glyphosate. Therefore if one is applying glyphosate to wild carrot at a volume of 200 L/ha (80 L/ac or 20 gpa) and having poor results, then perhaps lowering the water volume to 50-100 L/ha (20-40 L/ac or 5-10 gpa) may increase the level of control achieved.

Source:
Dr. Peter Sikkema, University of Guelph.

Number of Trials:

Table 1 is based on 2 field trials in Ontario.

Table 2 is based on 2 field trials in Ontario.

Table 3 is based on 1 field trial in Ontario.

Herbicide Rates:
Rates used in this trial are listed in OMAF Publication 75 - Guide to Weed Control.

Weed Stage:
Wild carrot had between 1 to 20+ leaves (1-35 cm. in height) at the time of the pre-plant applications and 3 to 20 + leaves (8-53 cm) at the time of post-emergent applications..

What has been your experience?
We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies.

Herbicide Control in Winter Wheat

Field experiments conducted by Peter Sikkema have shown that Refine Extra (thifensulfuron-methyl/tribenuron-ethyl) is the only product that will offer control of wild carrot in winter wheat (Table 1).

Source:
Dr. Peter Sikkema, Ridgetown College, University of Guelph.

Number of Trials:

Table 1 based on a summary of 1 field trial in winter wheat.

Herbicide Rates:
Rates used in this trial are listed in OMAF Publication 75 - Guide to Weed Control.

Weed Stage:
Wild carrot was at the 4 to 12 leaf stage (6 to 9 cm in height) at the time of application.

What has been your experience?
We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies.