[Eupatorium capillifolium (Lam.) Small]
Dogfennel is a perennial weed common to turf,
roadsides and container plants. Depending on the management practices for the
site, dogfennel can grow to be a very tall plant (exceeding 3 feet in height),
or may reach maturity as a short plant (less than 6 inches). The finely
dissected leaves of the plant make it easy to identify, and when crushed, the
leaves and stems have a very distinct odor that is slightly sour and musty. The
stems of dogfennel are soft and easily broken when young, but become very tough
and woody as it ages. In addition, the stems are very conspicuously hairy,
especially when young, but leaves are always hairless. Dogfennel could be
confused with several other common turf weeds, including horseweed and mugwort.
However, mugwort has very distinctive white wooly hairs on the underside of
each leaf, and horseweed has elongated leaves with few to no serrations, and
dogfennel has highly divided leaves.
upright, may reach more than 6
ft. (2 m) in height
deeply lobed, with serrated
lower leaves may be opposite,
but upper leaves are alternate
Note: Still not sure
this is the right weed? The Turf
& Weed Identification Decision Aid may help. Check the TurfFiles glossary for definitions
of unfamiliar terms.
broadleaf turf weeds are capable of living more than two years. They thrive in
weak, thin turf; golf fairways and roughs; home lawns; playfields; and
industrial grounds. Proper turf maintenance is the key to control of this
weed. First, select adapted turfgrass cultivars for your area and then
properly fertilize, mow, and water to encourage dense growth.
dogfennel is a perennial, it can be difficult to control. However, in our
research trials, we have had excellent control with several products. These
include the three- and four-way herbicides that contain 2,4-D and dicamba. We
have also had outstanding results with metsulfuron (Manor, Blade, MSM),
products that contain triclopyr (Confront, triclopyr ester, etc), and several
Tolerant Turfs (1)
Average Efficacy Rating(2)
Range of Trial Efficacy Values, %
Number of Trials
98 - 100
be, bk, c, f, r, z
91 - 100
be, sa, z
Escort**, Manor, MSM Turf
2,4-D & dicamba &
bk, f, r, z
MEC Amine-D*, Trimec
Bentgrass, Trimec Classic, Trimec Southern, Triplet
be, bk, f, r, z
Weedone LV4 EC
be, c, sa, z
AAtrex 4L*, Scotts Bonus S
Manor & QuickSilver
ba, bk, c, f, r, sa, z
ba, be, bk, f, r, z
43 - 100
Banvel, Clarity, Vanquish
For use only by or under the supervision of a
certified applicator, or by commercial nursery, turf, and landscape
Not for application to residential lawns.
turfgrass in the database is completely tolerant. Check label to see if
chemical can be used at a reduced rate or during the dormant season on your
control (90 to 100%)
control (80 to 90%)
control (70 to 80%)
ratings are based on herbicide trials performed by weed scientists at North
Carolina State University between 1997 and 2007. The number of trials
included in the efficacy ratings is displayed in the next-to-last column. The
higher this number, the more confidence can be placed in the efficacy values.
Trials may have involved sequential applications of one or more chemical.
Details of individual trials (herbicide rates, dates of application,
environmental conditions at time of application, etc) can be viewed on the
TurfFiles web site, through the Turf Weed Management
ratings for chemicals lacking trial data are from “Pest
Management Strategic Plan for Turfgrass in the Southern United States,”
summary of a workshop for turf experts from multiple universities held in
Griffin, GA in October, 2004 and sponsored by the Southern Region Integrated
Pest Management Center.
of specific chemicals are based upon information on the manufacturer's label
and performance in a limited number of trials. Because environmental
conditions and methods of application may vary widely, performance of the
chemical will not always conform to the safety and pest control standards
indicated by experimental data. The order in which brand names are given is
not an indication of a recommendation or criticism.
for the use of agricultural chemicals are included in this publication as a
convenience to the reader. The use of brand names and any mention or listing
of commercial products or services does not imply endorsement by North
Carolina State University or discrimination against similar products or
services not mentioned. Other brand names may be labeled for use on
turfgrasses. Individuals who use agricultural chemicals are responsible for
ensuring that the intended use complies with current regulations and conforms
to the product label. Be sure to obtain current information about usage
regulations and examine a current product label before applying any chemical.
For assistance, contact your county's Cooperative Extension agent.
© North Carolina State University. This information
sheet was prepared by Fred Yelverton, Bridget R. Lassiter, Gail G. Wilkerson,
Leon Warren, Travis Gannon, Jenifer J. Reynolds, and Gregory S. Buol.
Department of Crop Science, College of Agriculture & Life Sciences, North
Carolina State University. Prepared June 3, 2009.
Available on-line at www.turffiles.ncsu.edu. This publication was made possible
through a grant provided by the Center for Turfgrass Environmental Research
& Education (CENTERE) whose purpose is to support worthwhile projects that
will benefit both the private sector and the public, and protect the