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Herbicidal Control
Common tansy can be managed using metsulfuron, chlorsulfuron, or metsulfuron
plus chlorsulfuron. The herbicide labels indicate a rate of 1 to 2 ounces/acre or 1
to 3 ounces/acre using metsulfuron (Escort®) or chlorsulfuron (Telar®),
respectively. However, herbicide trials showed metsulfuron applied at a
broadcast rate of 0.5 ounce product (Escort® or Cimarron®) per acre at the late
bud stage of development (late June) provided nearly 100 percent control of a
population growing on moist soil one year after treatment. Similar results were
found using 0.25 ounce metsulfuron plus 0.25 ounce chlorsulfuron (similar to 0.5
ounce/acre Cimarron® X-tra). A non-ionic surfactant at 0.5 percent volume/volume
or methylated seed oil (MSO) at 2 percent volume/volume in the spray solution is
needed for these herbicides to be effective. Visible effects of the herbicides
were not apparent until 45 days after treatment. These chemicals will also
affect many shrub species. They can be applied to plants growing up to the edge
of water, but cannot be applied directly to water or areas where surface water
is present. Read herbicide labels for complete details of use restrictions.
Where high water tables are not present, picloram (1 quart/acre Tordon® or
Picloram 22K®) plus dicamba (1-2 quarts/acre Clarity®) applied to actively
growing plants in the bud to bloom stage can be used to control common tansy.
However, reports indicate this treatment is less effective than the metsulfuron
treatment and may be cost prohibitive. Picloram (2 quarts/acre) combined with
dicamba (1 pint/acre) applied to plants at bud stage provided 98 percent control
of common tansy 24 months after treatment. Where common tansy is growing in
water, imazapyr applied at 1 quart/acre (Habitat®) will provide some control.
Label restrictions should be carefully followed when applying herbicides to
water. On cropland, glyphosate applied at 2 quarts product/acre to actively
growing plants in combination with tillage may help control common tansy.
Table 1. Chemical and product name, recommended application rate,
soil residual half life, and eco-toxicity of herbicides commonly used to
control common tansy.
| Chemical name |
Product name |
Rate per Acre |
Half life (days) |
Eco-toxicity (LC50/EC50) |
| Dicamba |
Clarity/Banvel |
1 pint |
10 |
>100 mg/L |
| Chlorsulfuron |
Telar |
0.5 ounce |
45 |
>150 mg/L |
| Glyphosate |
many names |
2 quarts |
32 |
8.2 mg/L |
| Metsulfuron |
Escort/Cimarron |
0.5 ounce |
14-180 |
>150 mg/L |
| Picloram |
Tordon/Picloram 22K |
1-2 quarts |
90 |
10-100 mg/L |
The eco-toxicity is the lethal concentration of the herbicide when applied in
a single dose kills 50 percent of the tested organism (the lower the number the
more toxic the herbicide). Follow label guidelines for rangeland use and all
other label requirements when applying herbicides to avoid damage to desirable
plant species.
Note: Any mention of products in this publication does
not constitute a recommendation by the NRCS. It is a violation of Federal law to
use herbicides in a manner inconsistent with their labeling.
< Back to Ecology and Management of
Common Tansy (Tanacetum vulgare L.)
Last Modified:
08/21/2008
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