Trumpetcreeper: One Tough Plant
Glenn Nice, Weed Diagnostician, Department of Botany & Plant Pathology,
(Campsis radicans) is a native perennial vine that is
often found climbing fences, electric wire poles and, on occasion,
running along the ground when there is nothing to climb. Its common
name is appropriate because its most distinguishing characteristic
is its bright orange trumpet-like flower. The accompanying picture
shows Japanese beetles enjoying a smorgasbord of trumpetcreeper
flower. Trumpetcreeper vines can reach a length of up to 40 feet,
and leaves are oppositely arranged on the stems, with oppositely
arranged leaflets in a pinnately compound leaf. Each leaf can have
seven to 15 leaflets and each trumpetcreeper flower can produce
a long pod1.
other problematic perennials, Canada thistle to name one, trumpetcreeper
produces a deep root system that can produce new above ground stems. Although
trumpetcreeper can reproduce by seed, it is believed that root
stock is the dominate mechanism of proliferation. Root stock cut
0.8 inches long can produce shoots eight weeks after planting2.
Stems continued to emerge when root stock was buried nine inches
deep; however, planting depth from three to nine inches did not
have any effect on total above ground biomass2. To add to the fast
spread of trumpetcreeper, it can also root where the stems touch
soil. This would add to the ability to fragment into new plants.
the most part, in Indiana trumpetcreeper is a weed that sits on
the fence or the fringes of our row crops. Occasionally it can
invade no-till fields, reducing soybean yield and becoming a nuisance
at harvest time. It has been reported that 0.5 plants/m2 can reduce
soybean yield 18%3.
the herbicides labeled for conventional soybean will provide suppression
by burning or injuring the above ground portions of the plant when it is small.
To control the plant you have to control the underground portions
of trumpetcreeper by using a herbicide that will translocate. In one study the
application of glyphosate at 1 lb ae/A (ae stands for “acid equivalent”)
followed by a second application of 0.75 lb ae/A reduced biomass 89%4. The use
of a split application was reported to reduce biomass to acceptable amounts,
0.16, 0.14, and 0.06 oz dry weight/yard2 in three years, respectively4. Triclopyr
plus 2,4-D (Crossbow®) can also be used to suppress/control
trumpetcreeper in non-crop, fencerows and grass pastures. The use
of 1.5% v/v mixture or a 6 qt/A broadcast rate or 4 qt/A on permanent
pastures can provide approximately 60 to 79% control.
1) Trumpetcreeper or cow-itch: Campsis radicans. Accessed
3/13/06. Virginia Tech Weed Identification Guide. (http://www.ppws.vt.edu/scott/weed_id/cmira.htm).
2) Edwards, J.T. and L.R. Oliver. 2004. Emergence and
growth of trumpetcreeper (Campus radicans) as affected
by rootstock size and planting depth. Weed Technology 18:816-819.
3) Edwards, J.T. and L.R. Oliver. 2001. Interference
and control of trumpetcreeper (Campsis radicans) in soybean. Proceedings
of the Southern Weed Science Society 54:130-131.
4) Reddy, K.N. 2005. Deep tillage and glyphosate-reduced
redvine (Brunnichia ovata) and trumpetcreeper (Campsis
radicans) populations in glyphosate-resistant soybean. Weed