Abstract
![pink bindweed](https://webarchive.library.unt.edu/eot2008/20090115225315im_/http://attra.ncat.org/images/bindweed/bindweed_pink.jpg)
Pink Bindweed
www.clipart.com |
Field bindweed can be a pernicious weed. This publication
outlines alternative cultural and physical controls and the use
of cover crops and crop rotations to suppress field bindweed. It
also discusses least-toxic herbicides and provides a list of resources
for supplies and additional information about field bindweed control.
Table of Contents
Introduction
Field bindweed (Convolvulus arvensis; also known as
Creeping Jenny) is difficult to control without herbicides.
The weed produces a long taproot that generates many side roots.
These side roots produce buds that can develop into new plants.
Bindweed plants also produce many seeds that, with their tough
seed coats, can remain viable in the soil for years. To control
established bindweed in field crops, you must deplete the
roots’ energy resources by repeatedly destroying the top
growth. This can be done through a combination of intensive tillage,
frequent mowing, competitive crops, cover crops, and herbicides.
Cultural Controls
Bindweed is spread from plant pieces on tillage equipment, moved
from field to field by seeds on combines, introduced
by contaminated crop seed, and left on pastures when livestock
are fed hay or grain containing bindweed seeds. Bindweed-free fields
can be kept clean by keeping out bindweed seeds or plant parts
and by eliminating the spread of the weed from fields already
contaminated. Grazing can also be effective. Sheep and cattle eat
the leaves and stems, while hogs and chickens not only eat the
leaves and stems but also expose roots and crowns, further depleting
root reserves.(Stahlman, 1984)
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Physical Controls
Black plastic mulch or fabric weed barrier will
stifle
bindweed in high-value plantings by keeping light from reaching
the ground. Typically, the weed-free area is limited to the row,
while the middles are maintained with cultivation, mowing, or herbicides.
It may take three to four years of light exclusion to kill the bindweed.
Perennial plantings or vegetable plantings previously not using
either black plastic mulch or fabric weed barrier can realize the
benefit of bindweed control by switching over. Fabric weed
barrier is available from major horticultural and greenhouse suppliers
such as A.H. Hummert, A.M. Lenard, Peaceful Valley, DeWitt Company,
and Greenhouse suppliers. Black plastic mulch is typically available
through wholesale farm suppliers.
Crop Rotations and Cover Crops
Rotations that include tall, shade-producing crops can reduce bindweed
problems, since the weed is not very competitive under shady conditions.
Forage sorghum and sudangrass are excellent competitors with bindweed,
especially when they are solid-seeded in narrow rows. Sunflowers
planted at 40,000 plants per acre can also be a good competitor.
![alfalfa crop](https://webarchive.library.unt.edu/eot2008/20090115225315im_/http://attra.ncat.org/images/bindweed/alfalfa.jpg)
Growing alfalfa has been shown to greatly reduce
or eliminate Bindweed
Photo by Doug Wilson
USDA NRCS |
Some northern organic vegetable growers report good results from a sequence
of green-manure crops. One such sequence starts with fall-planted rye
and vetch. Then the cover crop is disked down in late spring, and the field
is replanted to buckwheat or oats with peas. Later in the summer, the field
is disked and replanted to buckwheat again. In the fall, rye and vetch
are planted again for over wintering. The following spring, this field
will be well suited to organic vegetable production. This sequence is
used to control many perennial weeds, including bindweed. In southern
states, a summer cover crop of forage sorghum or sudangrass could be substituted
for buckwheat or oat-pea mixtures.
In 1985, The New Farm magazine featured a farmer in Fort Collins,
Colorado, who used pumpkins and banana squash as a cheap bindweed “herbicide.”(Mattingly,
1985) The farmer, John Mattingly, allowed the bindweed to germinate
in spring then tilled the field. In June he planted pumpkins. He
fertilized with liquid nitrogen injected through the irrigation water,
which stimulated the pumpkins’ leaf and vine growth. Within a few
weeks, the bindweeds were shaded and strangled by the pumpkins so badly
that they produced no seed. After pumpkin harvest, he disked down
the pumpkin vines. Mattingly suspects that there is a chemical in the
pumpkin vines that discourages bindweed, because he’s had no bindweed
in his pumpkin field for nine years.(Mattingly, 1985)
He finds uses for his pumpkins, including Halloween sales and feeding
them to his cattle and hogs. He says pumpkins have twice as much
crude protein as corn.
Growing alfalfa has been shown to greatly reduce or eliminate bindweed.(Cox,
1909) The frequent cutting for hay and the smothering effect of the crop
puts bindweed at a disadvantage. Hay cutting works like mowing and tillage
to reduce top growth. Once cut, the alfalfa grows faster than bindweed
and shades it out. Two or three years of alfalfa in the crop rotation
will greatly reduce bindweed in a following corn crop.(Cox, 1909)
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Combining Mechanical and Cropping Strategies
Fred Kirschenmann writes about a five-year non-chemical strategy
developed at South Dakota State University that makes it pretty difficult
for any bindweed to survive.(Kirschenmann, 1992) The overall tillage system
used in this five-year plan starts by tilling in bindweed at the
bloom stage, when bindweed has most of its energy stored in the above-ground
portion rather than the roots.
The first year of the rotation begins with seeding the infested field
to sweet clover with an oat nurse crop. The oats are harvested at maturity,
and the sweet clover is allowed to grow until the following spring.
Year two starts by tilling the sweetclover into the top 3 to 4 inches
with a heavy disc. Generally, within three weeks bindweed will start coming
back, along with some of the clover. Then a sweep plow or under cutter
is used to kill this regrowth. The sweep plow’s advantage is that
it cuts the bindweed roots off underground, will not drag plant roots
to other parts of the field, and it leaves a mulch of dead plants
on the field. Kirschenmann continues using the sweep plow on bindweed
spots throughout the bindweed’s bloom stage. The sweep plow can
be run at a 3-inch depth during these later stages.
![sunflowers](https://webarchive.library.unt.edu/eot2008/20090115225315im_/http://attra.ncat.org/images/bindweed/sunflowers.jpg)
Sunflowers
planted at 40,000 plants per acre can also be a good bindweed competitor.
|
The third year, he plants an aggressive early spring crop such as spring
wheat. Following wheat harvest, Kirschenmann chisel plows the field
to encourage the bindweed to regrow. After bindweed regrows, he runs the
sweep plow through the field.
In year four, he tills as soon as the fields are dry enough to
get bindweed to grow, and he runs the sweep plow when the bindweed reaches
bloom stage. By mid-June a buckwheat crop is planted. The sweep plow can
be run again just prior to buckwheat planting, if necessary, to take out
the final bindweed plants. The fast-growing buckwheat smothers any
remaining bindweed. Following buckwheat harvest, Kirschenmann runs the
sweep plow again then plants a rye cover crop.
In the fifth year, following rye harvest, he chisel plowed the field
again to cause any remaining bindweed to regrow. Around mid-October the
sweep plow is run one last time.
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Least Toxic Herbicides
There are several new herbicides made from natural substances such as
acetic acid, clove oil, thyme oil, and soap, some of which can be used
in certified organic production. These are discussed below. Before
using one of these herbicides, make sure it is approved under the National
Organic Program by first checking with your certifying agency.
Several acetic acid (vinegar) based herbicides have been developed
for non-selective post-emergent use, including St. Gabriel
Labs’ BurnOut Weed and Grass Killer concentrate, Nature’s
Glory Weed and Grass Killer concentrate, Greenergy’s Blackberry
and Brush Block, Alldown Green Chemistry Herbicide, and Ground
Force from Abby Labs. These may come in handy as a spot spray in
combination with cultural controls. Acetic acid herbicides work
best when used in the sun. All of these, except Blackberry and
Brush Block, are effective at burning down top growth but will
not kill the roots. Blackberry and Brush Block is designed to kill
the roots; it is applied as a soil drench. It is made of concentrated
vinegar, and the soil will have to be limed after treatment to
restore the pH before plants can grow on the site again. Reapplication
is typically necessary for sustained control. A word of caution,
however; vinegar in concentrations greater than 5% acetic acid
may be hazardous—causing burns on the skin or eye damage—and
should be handled with care. When applying acetic-acid herbicides,
it is wise to wear a mask to avoid inhalation, and gloves to prevent
skin contact. Acetic acid can also erode some sprayer parts.
Nature’s Glory Weed and Grass Killer RTU and Fast Acting
BurnOut RTU are registered with EPA. Greenergy’s Blackberry
and Brush Block and Alldown Green Chemistry herbicide have a 25(b) “minimum
risk pesticide” exempt status with EPA so do not have EPA
registration numbers. The Greenergy product label lists acetic
acid as an inert ingredient and citric acid (at 7% concentration)
as the active ingredient. If an herbicide has an EPA registration
number, it has been approved for sale “at the Federal level,” however,
companies must still register their products with the individual
states to sell them there.
Acetic-acid herbicides are an expensive treatment for large areas,
and thus are much better suited for spot spraying. Approximate
cost for broadcast application of these vinegar herbicides ranges
from about $70 per acre to more than $800 per acre. These products
are available at some yard and garden outlets. I found them for
sale on several Web sites by using a typical search engine like
Google.com.
![white bindweed](https://webarchive.library.unt.edu/eot2008/20090115225315im_/http://attra.ncat.org/images/bindweed/bindweed_white.jpg)
White Bindweed
www.clipart.com |
Matran II is a non-selective post emergent for use on annual
grasses and broadleaf weeds. It contains 34% clove oil and is best
used on young weeds less than 2 inches high. It can be mixed with
vinegar. Xpress herbicide, containing clove and thyme oils, is
also a non-selective herbicide for burn-down of a large number
of weed species. It’s typically used for general broadleaf
and annual grass control before or after planting vegetables, grains,
legumes, fruit or nut trees, berry bushes, and grape vines.
Depending on how bad the infestation is, it may be worth considering
spot-spraying the bindweed with a systemic herbicide such
as Roundup, or another glyphosate formulation, if you are not certified
organic. A systemic herbicide kills the whole plant, including
the roots. Some other least-toxic herbicides to consider in non-organic
production would be Finale (glufosinate-ammonium) and Scythe (pelargoic
acid). Scythe, made by Mycogen Corporation, is a contact, non-selective,
broad-spectrum, foliar-applied herbicide. Less control is typically
seen on mature, inactive, or biennial and perennial weeds using
Scythe. It has no root activity or residual effect but kills only
top growth. Finale is promoted as an environmentally safe herbicide
used as a burn-down spray. It has very low toxicity, and once applied,
it breaks down into natural compounds such as carbon dioxide, nitrogen,
and water. It has no root activity.
Table 1. Possible least-toxic herbicide choices for bindweed control |
Herbicide |
Organic Allowed? |
BurnOut Weed and Grass Killer |
Yes/NOP ingredients |
Nature’s Glory Weed and Grass Killer |
Unknown |
Greenergy’s Blackberry and Brush Block |
Unknown |
Alldown Green Chemistry Herbicide |
Unknown |
Ground Force |
Unknown |
Matran II |
Yes/ USDA Organic |
Xpress |
Yes/NOP ingredients |
Glyphosate (Roundup et al) |
No |
Finale |
No |
Scythe |
No |
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References
Anon. 2001. You can conquer field bindweed. Growing for
Market. June.
p. 10-11.
Cox, H.R. 1909. The Eradication of
Bindweed or Wild Morning Glory. USDA Farmers’ Bulletin 386.
U.S. Government Printing Office, Washington, DC. 19 p.
Kirschenmann, F. 1992. Eradicating field bindweed; tillage,
rotation knock out weed. Northern Plains Sustainable Agriculture
Society Newsletter. January.
p. 5.
Mattingly, John C. 1985. This feed kills weeds. The New Farm.
September-October. p. 35.
Stahlman, P.W. 1984. Field
Bindweed: Prevention and Control. North Central Regional Extension
Publication 206. Kansas State University. June. 8 p.
Further Resources
Leininger, Wayne C. 1988. Non-chemical Alternatives for Managing
Selected Plant Species in the Western United States. Colorado
State University Cooperative Extension and U.S. Department
of the Interior Fish and Wildlife Service. p. 20-23.
Weaver, Susan. 2001. Field Bindweed. Ontario’s Ministry
of Agriculture and Food. Fact sheet. Agdex No. 640. 4 p. On-line
at:
www.gov.on.ca/OMAFRA/english/crops/facts/01-007.htm.
Zollinger, Richard K., and Rodney G. Lynn. 2000. Identification
and Control of Field Bindweed. North Dakota State University Extension
Service. W-802. 10 p. On-line at:
www.ext.nodak.edu/extpubs/plantsci/weeds/w802w.htm.
Suppliers List
[This list is not comprehensive and does not imply endorsement
of these companies.]
St. Gabriel Laboratories
800-801-0061
www.milkyspore.com/index2.htm
SommerSet Products, Inc.
4817 Normandale Highlands Dr .
Bloomington, MN 55437
952-820-0363
www.sumrset.com
Nature’s Glory
866-298-2229
www.naturesglory.com/
Greenergy, Inc.
P.O. Box 6669
Brookings, OR 97415
Greenergy@Earthlink.net
DeWitt Company
905 S. Kings Highway
Sikeston, MO 63801
573-472-02048
800-888-9669
www.dewittcompany.com
Enclosures
Martin, Jeff. 1998. Organic control of field bindweed.
The Ecological Solutions Roundtable. McGill University.
www.eap.mcgill.ca
Senft, D. 1990. Mighty mite takes on bindweed. Agricultural
Research. October. p. 26.
By Preston Sullivan
NCAT
Agriculture Specialist
August 2004
©NCAT
2004
Edited by Paul Williams
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