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ProCrop |
Field Bindweed Control in Fallow Cropland
| Long Term Field Bindweed Control from Herbicides Applied Once in September 1988 | ||||
Months After Treatment |
||||
| Herbicide | Rate | 9 | 12 | 22 |
| lb/A | ----------%---------- | |||
| Glyphosate plus 2,4-D (Landmaster BW) | 0.4 + 0.6 | 60 | 10 | 0 |
| Dicamba (Banvel/Clarity | 1 | 95 | 50 | 35 |
| Dicamba (Banvel/Clarity) | 2 | 95 | 65 | 50 |
| Dicamba plus 2,4-D | 0.5 + 0.5 | 80 | 40 | 0 |
| Picloram(Tordon) | 0.25 | 95 | 85 | 75 |
| Picloram plus 2,4-D | 0.125 + 1 | 85 | 70 | 40 |
| Picloram plus 2,4-D | 0.25 + 1 | 95 | 90 | 60 |
| Quinclorac (Paramount) + MSO (b) | 0.25 + 1 qt | 95 | 90 | 20 |
| Quinclorac (Paramount) = MSO (b) | 0.5 + 1 qt | 99 | 99 | 90 |
a) compilation of various research reports from North Dakota State University and the Western Society of Weed Science
b) methylated seed oil adjuvant
SEVERAL FACTS ABOUT USE OF THE TREATMENTS
FOUND IN THE TABLE ABOVE SHOULD BE CONSIDERED:
1. Tordon at 0.13 to 0.25 pound/acre plus 2,4-D at 0.5 to 1 pound/acre should be
applied to field bindweed when plant stems are 8 to 12 inches long, and the bindweed
plants are actively growing.
2. Delay tillage until one to two weeks following application. A longer interval is
suggested if hot, dry conditions exist.
3. Retreatment will be necessary for long-term field bindweed control. Tordon plus
2,4-D will not provide 100 % control. Either Tordon plus 2,4-D at the lower picloram rates
or another method of control should be used the next year to control regrowth.
4. For treatments containing Tordon apply only on land to be used the following year
for grass, barley, oat, wheat or fallow. Do not plant sensitive broadleaf crops for 36
months after treatment or until residues have dissipated in the soil as indicated by a
bioassay with intended crop to be planted.
5. Interval between application and the follow crop is 45 days for picloram rates up to
0.13 pound/acre and 90 days for rates between 0.13 and 0.25 pounds/acre.
6. Quinclorac (Paramount) provides excellent field bindweed control (Table 2) and
should be applied with a methylated seed oil at 1.5 to 2 pints per acre. Ammonium sulfate
at 2.5 pounds per acre or urea ammonium nitrate may also be added. Quinclorac may also
control foxtails, barnyard grass, and volunteer flax.
7. Quinclorac may carryover in soil for one year or more. Most crops may be planted 10
months after quinclorac application except flax, chickpea, dry pea, and sugarbeet which
require a 24-month interval between application and seeding. Consult the label for
complete rotational restrictions.
Adequate soil moisture and soil temperature during the preplant interval is important in reducing the risk of crop injury. In considering the use of picloram on fallowland, growers should consider the benefit of field bindweed control against the risk of crop damage and treat only if the risk of injury to small grains can be tolerated.
In a spring wheat-fallow rotation, Tordon plus 2,4-D can adequately control field bindweed with minimal risk of crop injury. Apply Tordon at 0.25 pound/acre plus 2,4-D at 1 pound/acre after small grain harvest, and use the same treatment with lower picloram rates or other effective treatments in the fallow season to control missed plants, regrowth, and seedlings.
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