Dandelion (Taraxacum officinale Weber.)
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Table of Contents
- History
- Life Cycle
- Distinguishing Characteristics
- Control in Corn
- Control in Soybeans
- Control in Winter Wheat
History
One of the most widespread and abundant weeds in Ontario growing in virtually every type of habitat.
Life Cycle
Perennial, reproducing only by seed.
Distinguishing Characteristics
Probably the most easily identified weed, dandelion contains a milky white juice, a deep taproot, irregularly lobed leaves and a yellow flower head. For more information refer to Page 252 in OMAF Publication 505 - Ontario Weeds.
Dandelion
Pictures
Each thumbnail image links to a larger image
Herbicide Control in Field Corn
Pre-Plant Control:
Pre-plant applications are effective at controlling established dandelions and newly emerged seedlings. A number of herbicides and tank-mixes will provide adequate control (Table 1). Certain products and tank-mixes stipulate cropping restrictions (Table 2).
* A guideline only. The user must consult the manufacturer's product label before using any of the products mentioned in the section.
Pre or Post Emergent Control
A pre-plant or fall applied application is ideal for dandelion control in corn. If either one of those applications couldn't be made then based on limited research, a post-emergent application of Banvel II should provide good control of dandelion (Table 3).
Field experience has suggested that pre-emerge applications of isoxaflutole/atrazine (CONVERGE) or post-emergent applications of nicosulfuron/rimsulfuron + diflufenzopyr/dicamba (ULTIM TOTAL) can be effective at controlling dandelion.
Post Harvest Control
Fall herbicide applications are ideal for controlling larger established
dandelions. Cooler temperatures will trigger dandelion to move sugars
down to the taproot for storage. Applying a systemic herbicide in
the fall promotes movement of the active ingredient down to the
roots providing effective long-term control. In general numerous
products and tank-mixes provide adequate control of dandelion when
applied in the fall (Table 4). Deciding on
which one to use will depend on the weed spectrum, cost and rotational
flexibility of the specific herbicide or tank-mix. Refer to Table
2 and the product label for information on rotational restrictions.
Source:
Dr. Peter Sikkema, Ridgetown College, University of Guelph.
Number of Trials:
Tables 1 and 4 are based on a summary of 2 field trials.
Table 3 based on a summary of 1 field trial.
Herbicide Rates:
Rates used in this trial are listed in OMAF Publication 75 - Guide
to Weed Control.
Weed Stage:
Dandelion size ranged from 5 to 40 cm om diameter 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.
Herbicide Control in Soybeans
Pre-Plant Control:
Pre-plant applications are effective at controlling established dandelions and newly emerged seedlings. A number of herbicides and tank-mixes will provide adequate control (Table 1). Certain products and tank-mixes stipulate cropping restrictions (Table 2). BANVEL II or 2,4-D products CANNOT be applied in the spring prior to planting soybean as unacceptable crop injury can occur.
* A guideline only. The user must consult the manufacturer's product label before using any of the products mentioned in the section.
Post Emergent Control
Field observations have shown that chlorimuron-ethyl (CLASSIC) will provide good post-emergent and residual control of dandelion seedlings provided they are less than 15 cm. in diameter.
Post Harvest Control
Fall herbicide applications are ideal for controlling larger established
dandelions. Cooler temperatures will trigger dandelion to move sugars
down to the taproot for storage. Applying a systemic herbicide in
the fall promotes movement of the active ingredient down to the
roots providing effective long-term control. In general numerous
products and tank-mixes provide adequate control of dandelion when
applied in the fall (Table 4). Deciding on
which one to use will depend on the weed spectrum, cost and rotational
flexibility of the specific herbicide or tank-mix. Refer to Table
2 and the product label for information on rotational restrictions.
Source:
Dr. Peter Sikkema, Ridgetown College, University of Guelph.
Number of Trials:
Tables 1 and 3are based on a summary of 2 field trials.
Herbicide Rates:
Rates used in this trial are listed in OMAF Publication 75 - Guide
to Weed Control.
Weed Stage:
Dandelion size ranged from 5 to 40 cm om diameter 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.
Herbicide Control in Winter Wheat
Post Emergent Control
Estaprop, Turboprop or Dichlorprop-D are the only products that provide adequate control of dandelion. Winter wheat fields should be scouted for the presence of dandelions in mid to late April and if present in high enough populations should be treated as early as possible. Late applications of Estaprop, turboprop or Dichlorprop-D can cause unacceptable levels of crop injury and therefore should be applied before the late tillering or 1st node stage of winter wheat.
Active Ingredient | Trade Name |
% Control
|
---|---|---|
dichlorprop/2,4-D | ESTAPROP, TURBOPROP, or DICHLORPROP D |
91
|
bromoxynil/MCPA | BUCTRIL M, BADGE or MEXTROL |
64
|
2,4-D | 2,4-D Amine (Numerous Brands Exist) |
61
|
MCPA | MCPA AMINE (Numerous Brands Exist) |
61
|
dicamba/MCPA/mecoprop | SWORD or TARGET |
61
|
thifensulfuron-methyl/tribenuron methyl | REFINE EXTRA |
56
|
Source:
Dr. Peter Sikkema, Ridgetown College, University of Guelph.
Number of Trials:
Tables 1 is based on a summary of 3 field trials.
Herbicide Rates:
Rates used in this trial are listed in OMAF Publication 75 - Guide
to Weed Control.
Weed Stage:
Dandelion size ranged from 5 to 40 cm om diameter 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.
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
Email: ag.info@omaf.gov.on.ca