Field bindweed is a deep-rooted perennial weed that severely reduces crop yields and land value. This noxious weed infests just under 2 million acres and is found in every county in Kansas. Bindweed is notoriously difficult to control, especially with a single herbicide application. During the fall, but prior to a killing freeze, can be an excellent time to treat field bindweed -- especially in a year when good fall moisture has been received. This perennial weed is moving carbohydrate deep into its root system during this period, which can assist the movement of herbicide into the root system.
Figure 1. Field bindweed ready for a fall treatment. Photo by Curtis Thompson, K-State Research and Extension.
The most effective control program includes preventive measures over several years in conjunction with persistent and timely herbicide applications. The use of narrow row spacings and vigorous, competitive crops such as winter wheat or forage sorghum may aid control. No-till has been very beneficial for managing bindweed by providing routine herbicide treatments through time and not breaking up the root system and dragging root segments around the fields. No-tillage maintains much of the bindweed seed soil bank at a depth too deep to germinate. It is common to see a resurgence of bindweed after tilling fields that have been in long-term no-till.
Dicamba, Tordon, 2,4-D ester, Facet L (also generics) and glyphosate products alone or in various combinations are registered for suppression or control of field bindweed in fallow and/or in certain crops, pastures, and rangeland. Apply each herbicide or herbicide mixture according to directions, warnings, and precautions on the product label(s). Single herbicide applications rarely eliminate established bindweed stands.
Applications of 2,4-D ester and glyphosate products are most effective when spring-applied to vigorously growing field bindweed in mid to full bloom. However, dicamba and Tordon applications are most effective when applied in the fall. Herbicide treatments are least effective when applied when bindweed plants are stressed.
Facet L, at 22 to 32 fl oz/acre, a new quinclorac product that replaced Paramount at 5.3 to 8 oz, or QuinStar quinclorac products, can be applied to bindweed in fallow prior to planting winter wheat or grain sorghum with no waiting restrictions. All other crops have a 10-month pre-plant interval. Quinclorac products can be used post-emergence in sorghum to control field bindweed during the growing season. In past K-State tests, fall applications of Paramount have been very effective as shown below (Tables 2 and 3).
Additional noncropland treatments for bindweed control include Krenite S, Plateau, and Journey.
Considerable research has been done on herbicide products and timing for bindweed control. Although the research is not recent, the products used for bindweed control and the timing options for those products haven’t changed much since this work was done. As a result, the research results in the tables below remain very useful today.
Table 1. Fall vs. spring and summer herbicide application for control of field bindweed in the Texas Panhandle: 1976-1982.
|
|
|
Season of application |
||
|
|
Rate (lbs ai/acre) |
Spring |
Summer |
Fall |
|
Treatment |
% Control one year after treatment |
|||
|
Glyphosate |
2.9 |
83 |
77 |
60 |
|
Dicamba |
1.0 |
56 |
41 |
71 |
|
2,4-D ester |
1.0 |
65 |
49 |
55 |
|
Tordon + 2,4-D ester |
0.25 + 0.5 |
55 |
56 |
84 |
|
Tordon + Dicamba |
0.25 + 0.25 |
47 |
73 |
87 |
|
Tordon + Glyphosate |
0.20 + 1.6 |
52 |
73 |
79 |
|
|
% Control two years after treatment |
|||
|
Glyphosate |
2.9 |
67 |
63 |
32 |
|
Dicamba |
1.0 |
31 |
37 |
34 |
|
2,4-D ester |
1.0 |
46 |
42 |
10 |
Source: Field Bindweed Control in Field Crops and Fallow, MF-913
http://www.ksre.ksu.edu/bookstore/pubs/MF913.pdf
Table 2. September-applied treatments for control of field bindweed: Randall Currie and Curtis Thompson, Southwest Research-Extension Center 1992-1993.
|
Treatment |
Rate |
Average % control in spring |
|
Dicamba |
4 oz |
31 |
|
Dicamba |
8 oz |
44 |
|
Dicamba |
1 pt |
85 |
|
2,4-D |
1 pt |
48 |
|
Dicamba + 2,4-D |
8 oz + 8 oz |
82 |
|
Paramount |
5.3 oz |
91 |
|
Paramount + Dicamba |
5.3 oz + 4 oz |
98 |
|
Paramount + Dicamba |
5.3 oz + 8 oz |
97 |
Source: 1995 Field Day Southwest Research-Extension Center, Report of Progress 739
http://www.ksre.k-state.edu/historicpublications/pubs/SRP739.pdf
Table 3. September-applied treatments for control of field bindweed: Randall Currie, Southwest Research-Extension Center 1992-1997.
|
Treatment |
Rate |
Average % Control in Spring |
|
Dicamba |
4 oz |
19 |
|
Dicamba |
8 oz |
65 |
|
Dicamba |
1 pt |
89 |
|
2,4-D |
1 pt |
72 |
|
2,4-D |
1 qt |
81 |
|
Glyphosate |
1 qt (IPA) |
68 |
|
Paramount |
5.3 oz |
90 |
|
Tordon |
8 oz |
75 |
|
Tordon |
1 pt |
98 |
Source: 1999 Field Day Southwest Research-Extension Center, Report of Progress 837
http://www.ksre.k-state.edu/historicpublications/pubs/SRP837.pdf
For more information on controlling bindweed, see 2019 Chemical Weed Control for Field Crops, Pastures, Rangeland, and Noncropland, K-State publication SRP-1148.
Dallas Peterson, Weed Management Specialist
dpeterso@ksu.edu
Randall Currie, Weed Scientist, KSU Southwest Research-Extension Center, Garden City
rscurrie@ksu.edu
Tags: weeds weed control