2008 North Dakota Weed Control Guide
W-253, January 2008
R. K. Zollinger, NDSU Extension Weed Specialist
CHEMICAL FALLOW
For Future Planting of Wheat, Durum, Barley, and Oat - Refer to label for other registered crops.
|
Herbicide | Product/A
(ai/A) | Weeds |
When to Apply |
Remarks and Paragraphs Trifluralin
| 6 to 10 lb 10G
| (0.6 to 1 lb) Grass and some
broadleaf weeds.
| PPI in fallow.
| Incorporate the first time within 24 hours after
application. Delayed second incorporation until weed
control is necessary. D13 S7 Q8 X1 Y1 Y18 Y24
| Valor | (flumioxazin) Future Planting of Wheat and Durum 2 to 3 oz WDG | (0.063 to 0.094 lb) Most small-seeded broadleaf
weeds.
| Post-harvest in
fall until 30 days
prior to planting.
| Apply in spring with glyphosate or 2,4-D for control of
emerged vegetation. Apply with NIS at 0.25% v/v or
petroleum oil adjuvant at 12 pt/A for burndown
applications. Refer to label for additional information. | D16 V1 Atrazine | Future Planting of Wheat and Durum Only RUP 0.55 to 1.11 lb DF | (0.5 to 1 lb) Annual broadleaf
and grass weeds
including downy
brome.
| Weeds: Before
emergence.
| Plant at least 2 inches deep and allow at least 12
months before planting. Refer to label for restricted
application areas. Apply with paraquat at 1 to 2 pt/A +
NIS at 0.125 to 0.25% v/v to emerged weeds less than 6
inches tall. | C6 V1 Y4 Y8 Y24 Paraquat | RUP 1.5 to 4 pt 2SL | 1 to 2.7 pt 3SL (0.375 to 1 lb) Emerged annual
grass and
broadleaf weeds.
| Weeds: Less
than 6 inches tall.
| Non-residual, contact, herbicides; thorough coverage
required. | Apply with NIS at 0.25% v/v to small weeds. Refer to pages 108-109 for commercial mixtures. B4 S1 S3-4 Q5 X1 Aim | (carfentrazone) 0.5 to 1 fl oz EW | (0.128 to 0.256 oz) Broadleaf weeds
including pigweed
and ALS kochia.
| Weeds: Less
than 2 inches tall.
| Thifensulfuron +
Tribenuron | 4:1 ratio (TankMix) 2:1 ratio (H. Extra) 1:1 ratio (BrdSpec) Product rates vary
depending on ratio
and formulation.
| Annual broadleaf
weeds.
| Any time after
harvest until 60
days prior to
planting crop.
| Apply with NIS at 0.25 to 0.5% v/v unless restricted by
the tank-mix partner. Apply in a tank-mixture with other
registered herbicides to delay weed resistance. | Products containing tribenuron give season-long Canada thistle control. Products containing metsulfuron give season-long control of perennial sowthistle. Refer to pages 108-109 for commercial mixtures. A7 X1 Y3 Y24 Metsulfuron
| 0.1 oz DF
| Thifensulfuron & | Tribenuron & Metsulfuron 0.2 oz DF | 0.3 to 0.5 oz SG Chlorsulfuron & | Metsulfuron 0.2 to 0.3 oz DF
| 2,4-D
| 1.5 to 4 pt 4EC/SL | (0.75 to 2 lb) Broadleaf weeds
and suppression
of Canada thistle.
| POST. | Use the higher rate for perennial weeds.
B2 Q1
| Dicamba
| 0.5 to 1 pt | (0.25 to 0.5 lb) Soil residual from fall application may damage broadleaf
crops seeded the next year. | B2 X1 Y11 Y24 Distinct | (dicamba & diflufenzopyr) 6 oz WDG
(3 oz & 1.2 oz)
| Add NIS at 0.25% v/v + 28% UAN at 1.25 qt/A or AMS at
17 lb/100 gallons. | Refer to label for tank-mix options. Distinct at 6 oz 70WDG/A = 6 fl oz Clarity. C10 Y11 Y24 |
CHEMICAL FALLOW
Herbicide
Product/A
(ai/A)
Weeds
When to Apply
Remarks and Paragraphs
Glyphosate
0.38 to 1.5 lb ae
See Remarks.
Annual and
perennial grass
and broadleaf
weeds.
Weeds: Less
than 12 inches
tall.
See label.
lb ae/gal lb ai/gal 0.38 ae 0.75 ae 1.125 ae 1.5ae
3 4 = 16 fl oz 32 fl oz 48 fl oz 64 fl oz
4/4.17 5.4 = 12 fl oz 24 fl oz 36 fl oz 48 fl oz
4.5 5.5 = 11 fl oz 22 fl oz 32 fl oz 44 fl oz
5 6.1 = 10 fl oz 20 fl oz 30 fl oz 40 fl oz
Non-selective, non-residual, translocated, foliar
herbicide.
Apply with AMS fertilizer. Use the lower rate for annual
grasses. Glyphosate will not control glyphosate- resistant
volunteer crops. Apply with 2,4-D or dicamba for
improved broadleaf weed control. Refer to label of tank-mix partner for rates, adjuvant use, application
information, crop rotation restrictions, and other
restrictions.
A4-6 A7 Q1 X1 Y11 Y24
Clopyralid & 2,4-D
4 pt
(0.19 & 1 lb)
Broadleaf weeds
including
Canada thistle.
Canada thistle:
Prior to bud
stage.
Apply after a majority of rosettes have emerged.
Refer to narrative for rotational restrictions.
Refer to pages 108-109 for commercial mixtures.
B10 T2 T6 X1 Y20 Y24
Tordon 22K
(picloram)
RUP
0.25 to 0.5 pt
(0.063 to 0.125 lb)
Annual weeds.
Weeds: Actively
growing.
Refer to label for grazing and rotational restrictions.
Do not rotate to corn or sorghum the following year.
Rates greater than 0.5 pt/A should be used post-harvest
when rotating to fallow the following year.
T2-4 T6 T15 X1 Y1 Y21 Y24
Tordon 22K
(picloram) +
2,4-D
RUP
0.5 to 1 pt +
1 to 2 pt
(0.125 to 0.25 +
0.5 to 1 lb)
Perennial weeds.
Canada thistle:
Prior to bloom.
Field bindweed:
Actively growing.
Paramount
(quinclorac)
Future Planting of
Wheat and Durum
Only
0.33 lb DF
(0.25 lb)
Field bindweed:
Runners at least
4 inches long.
Postharvest or in
the spring prior to
seeding of wheat
including durum.
Apply with MSO adjuvant at 1.5 pt/A. AMS at 2.5 lb/A or
UAN at 1 gal/A may also be added to improve control but
do not substitute for MSO.
Apply after harvest but prior to frost.
Suggested to use in a 3-year program with
0.33 lb DF/A the first year and 0.17 to 0.33 lb DF/A in
following years. May control foxtails, barnyardgrass, and
volunteer flax.
Q2 T1 Y15 Y24
Starane
(fluroxypyr)
0.67 pt
(2 oz)
Kochia including
resistant
biotypes.
Weeds: 4- to 8-inches tall.
No residual weed control.
Controls ALS-resistant and dicamba-resistant kochia. Do
not plant any crop for 120 days after application.
B10 S3 X1
CRP
Herbicide
Product/A
(ai/A)
Weeds
When to Apply
Remarks and Paragraphs
Glyphosate
0.38 to 1.5 lb ae
See Remarks.
Annual and
perennial grass
and broadleaf
weeds.
Preplant or any
time prior to crop
emergence.
lb ae/gal lb ai/gal 0.38 ae 0.75 ae 1.125 ae 1.5ae
3 4 = 16 fl oz 32 fl oz 48 fl oz 64 fl oz
4/4.17 5.4 = 12 fl oz 24 fl oz 36 fl oz 48 fl oz
4.5 5.5 = 11 fl oz 22 fl oz 32 fl oz 44 fl oz
5 6.1 = 10 fl oz 20 fl oz 30 fl oz 40 fl oz
Apply with AMS fertilizer. Use the lower rate for annual
grasses. Glyphosate will not control glyphosate resistant
volunteer crops.
A4-6 Q1 X1
2,4-D
1.5 to 4 pt 4EC/SL
(0.75 to 2 lb)
Annual broadleaf
weeds, biennial
thistles, and
suppression of
perennial
broadleaf weeds.
Weeds:
Emergence to
bud stage.
Apply only 2,4-D brands registered for use in CRP.
Do not graze animals for 7 days after application or
within 3 days of slaughter.
Do not apply after boot stage on grasses for seed
production. Use 2 pt/A on annuals and gumweed and 4
pt/A on sages and other perennials.
Controls buckbrush/western snowberry.
Refer to pages 108-109 for commercial mixtures.
T2 T3 T8 X1
Pasture grasses:
After 5-leaf stage.
Dicamba
0.5 to 4 pt
(0.25 to 2 lb)
Grasses: After
3-leaf stage of
seedling grasses.
Weeds: Prior to
bud stage for
thistles and
knapweeds.
Apply with a NIS.
Spray drift from dicamba may injure nearby susceptible
crops and trees. Rates greater than 1 pt/A may injure
newly seeded grasses.
Consult the label for grazing restrictions and tank
mixtures with other herbicides.
Refer to pages 108-109 for commercial mixtures.
T2 T3 T10 X1 Z1
Dicamba +
2,4-D
1 to 4 pt +
2 pt 4EC/SL
(0.5 to 2 + 1 lb)
Biennial thistles:
Rosette stage.
Apply with NIS at 0.25 to 0.5% v/v.
Refer to pages 108-109 for commercial mixtures.
T2-3 T8 T10 X1 Z1
Overdrive
(dicamba &
diflufenzopyr)
6 oz WDG
(3 oz & 1.2 oz)
Prior to bud stage
for thistles and
knapweeds.
Add NIS at 0.25% v/v + 28% UAN at 1.25 qt/A or AMS at
17 lb/100 gallons. Canada thistle suppression only. C10
T2 Y11 Y24
Metsulfuron
1/10 to 1 oz DF
(0.06 to 0.6 oz)
Season-long
control of
perennial
sowthistle.
Fall or spring to
early summer.
Weeds: Less
than 4 inches tall.
Apply with phenoxy type herbicide to small annual weeds
or before thistle plants bolt.
Apply with NIS at 0.25 to 0.5 % v/v or
oil adjuvant at 1% v/v.
Add 2,4-D for Russian thistle control.
Use Cimarron Max for control of buckbrush and
perennial species.
T2 T11 X1 Y3 Y24 Z1
Chlorsulfuron &
Metsulfuron
Annual weeds =
Rate I:
1/4 oz + 1/4 oz DF
Perennial weeds =
Rate II:
1/2 oz + 1/2 oz DF
(0.15 to 0.3 &
0.188 to 0.375 oz)
Annual, perennial
weeds, and brush
species including
Canada thistle,
per. sowthistle,
other thistles,
snowberry or
buckbrush.
Also registered on pasture and rangeland.
Cimarron Xtra = Co-pack of metsulfuron + Telar.
Rate I treats 40 acres. Rate II treats 20 acres.
Apply with NIS at 0.25% v/v or petroleum or MSO oil
adjuvant at 1% v/v. Safe to most grasses.
May be tank-mixed with phenoxy type herbicides.
Refer to label for additional information.
No grazing or haying restrictions.
Refer to pages 108-109 for commercial mixtures.
T2 T11 X1 Y3 Y24 Z1
Cimarron Max
(metsulfuron &
2,4-D & dicamba)
Annual weeds =
Rate I:
1/4 oz DF + 1 pt
Perennial weeds =
Rate II:
1/2 oz DF + 2 pt
(0.15 to 0.3 oz &
0.36 to 0.72 lb &
0.125 to 0.25 lb)
Cimarron Max = Co-pack of metsulfuron + Weedmaster
(2,4-D + dicamba).
The 0.25 oz + 1 pt rate will treat 20 acres.
Apply with NIS at 0.25 to 0.5% v/v.
Safe to most grass but refer to label for NIS rates for
certain grass species.
T2 T11 X1 Y3 Y24 Z1
CRP
Herbicide
Product/A
(ai/A)
Weeds
When to Apply
Remarks and Paragraphs
Clopyralid
1/3 to 2/3 pt
(2 to 4 oz)
Broadleaf weeds
including Canada
thistle and
knapweeds.
Weeds: Actively
growing and prior
to bud stage for
thistles and
knapweeds.
Apply after most thistle shoots have emerged but before
bud stage. Do not apply clopyralid & 2,4,D to new grass
seedings. Use lower rate for annual broadleaf weeds
and higher rate for perennial thistles and knapweeds.
Do not cut treated grass for hay within 30 days after
application.
T2 Z1
Clopyralid &
2,4-D
4 to 8 pt
(1 to 2 oz &
0.19 to 0.38 lb)
Crossbow
(triclopyr &
2,4-D)
1 to 6 qt
(0.25 to 1.5 &
0.5 to 3 lb)
Trees, brush and
broadleaf weeds.
Spring: Prior to
bud stage for
thistles and
knapweed.
Fall: To rosettes.
Provides more consistent musk thistle and brush control
(except buckbrush and western snowberry) than 2,4-D
alone. Will control most unwanted tree species. Use
highest rate for elm and Russian olive.
Observe grazing and haying restrictions.
T9
Redeem
(triclopyr &
clopyralid)
Annual weeds =
1.5 to 2.5 pt
Perennial weeds =
2.5 to 4 pt
(0.4 to 1.1 &
0.15 to 0.4 lb)
Annual and
perennial weeds,
brush, and trees.
Spring: Prior to
bud stage for
thistles and
knapweed.
Fall: To rosettes.
Apply with NIS at 0.25% v/v. Cost-effective formulation of
clopyralid. Provides broad-spectrum broadleaf weed
control including thistles and knapweeds but not leafy
spurge. Use high rates for perennial weeds. Observe
grazing and haying restrictions for lactating animals. T2
T14 Z1
Starane
(fluroxypyr)
0.67 to 1.33 pt
(2 to 4 oz)
Kochia and a few
broadleaf weeds.
Spring: Kochia
less than 6 inches
tall.
Will kill desirable legumes but controls kochia, including
ALS-resistant kochia.
B10 S5
Milestone
(aminopyralid)
3 to 7 fl oz
(0.75 to 1.75 oz)
Most annual and
perennial
composite weeds,
including
wormwood and
thistles. See
label.
Spring: Rosette to
bolting or in fall.
Apply up to 14 oz/A for spot treatment.
Milestone can leave a residue for several years following
application. Legume species are very susceptible. Refer
to label for crop rotation restrictions if CRP breakout is
planned.
T12 Y24 Z1
Tordon
(picloram)
RUP
0.25 to 0.5 pt
(0.06 to 0.13 lb)
Annual broadleaf
weeds.
Weeds: Small
and actively
growing.
Use 0.25 to 0.5 pt/A for small annual weeds.
Use 2 pt/A for suppression and 4 pt/A as spot treatment
to control perennial weeds.
Rates over 2 pt/A may suppress perennial grasses.
Observe grazing restrictions. Apply with 2,4-D to provide
cost-effective weed control. Picloram can leave a residue
for several years following application. Refer to label for
crop rotation restriction if CRP breakout is planned.
T2 T3 T15 Z1
1 to 4 pt
(0.25 to 1 lb)
Perennial
broadleaf weeds
and trees.
Emergence to
bud stage.
Plateau
(imazapic)
4 to 12 fl oz for
pasture,
rangeland,
native prairie
restoration, and
wildflower
establishment.
(1 to 3 oz)
Foxtail and
annual and
perennial
broadleaf weeds
including leafy
spurge.
PRE or POST.
Grasses: 7 to 10
days after
planting.
Weeds: Up to 6
inches tall.
Early September
to early October.
Apply in mid-September for
leafy spurge
control.
Use on newly established or existing grass stands.
Has PRE activity on annual weeds
Use an MSO type adjuvant at 2 pt/A.
4 fl oz/A controls/suppresses annual weeds.
12 fl oz/A controls annual weeds plus leafy spurge and
Russian knapweed.
Rates above 8 fl oz/A can cause reduced grass
production, especially cool-season grasses.
Use lower rates in areas of low rainfall.
High risk of injury to switchgrass.
No grazing restrictions specified.
Does not control absinth wormwood, Canada thistle, or
spotted knapweed.
T13 T17 Y24 Z1
GRASS ESTABLISHMENT
Herbicide
Product/A
(ai/A)
Weeds
When to Apply
Remarks and Paragraphs
Glyphosate
0.38 to 1.5 lb ae
See Remarks.
Emerged grass
and broadleaf
weeds.
Preplant or
anytime prior to
crop emergence.
lb ae/gal lb ai/gal 0.38 ae 0.75 ae 1.125 ae 1.5ae
3 4 = 16 fl oz 32 fl oz 48 fl oz 64 fl oz
4/4.17 5.4 = 12 fl oz 24 fl oz 36 fl oz 48 fl oz
4.5 5.5 = 11 fl oz 22 fl oz 32 fl oz 44 fl oz
5 6.1 = 10 fl oz 20 fl oz 30 fl oz 40 fl oz
Non-selective, non-residual translocated, foliar herbicide.
Apply with AMS fertilizer. Refer to label for adjuvant use.
A4-6
2,4-D
MCPA
0.5 to 1 pt 4EC/SL
(0.25 to 0.5 lb)
Broadleaf weeds.
Grasses: After 5-leaf stage.
Use rates listed for establishing grasses.
T8 X1
Bromoxynil
1 to 2 pt
(0.25 to 0.5 lb)
Grasses: Anytime
after emergence.
Grass tolerance is excellent.
Can be applied to grass-alfalfa mixtures.
Registered CRP species include wheatgrasses =
crested, tall, western, bluebunch, and intermediate,
perennial ryegrass, fescue, Russian wildrye, and alfalfa.
Bromoxynil &
MCPA
1 to 2 pt 4EC
0.8 to 1.6 pt 5EC
(0.25 to 0.5 &
0.25 to 0.5 lb)
POST:
Grasses: 3-leaf
stage or larger.
Refer to bromoxynil section above for registered grass
species. Refer to pages 108-109 for commercial
mixtures.
Consult label for list.
Starane
(fluroxypyr)
0.67 to 1.33 pt
(2 to 4 oz)
Kochia and a few
broadleaf weeds.
Spring: Kochia
less than 6 inches
tall.
Will kill desirable legumes but controls kochia, including
ALS-resistant.
B10 S5
Continue to next page
VEGETATION CONTROL FOR CRP BREAKOUT
Herbicide
Product/A
(ai/A)
Weeds
When to Apply
Remarks and Paragraphs
Glyphosate
0.75 to 1.5 lb ae
See Remarks.
CRP vegetation
and weeds.
14 to 21 days
prior to tillage.
lb ae/gal lb ai/gal 0.75 ae 1.125ae 1.5 ae
3 4 = 32 fl oz 48 fl oz 64 fl oz
4/4.17 5.4 = 24 fl oz 36 fl oz 48 fl oz
4.5 5.5 = 22 fl oz 32 fl oz 44 fl oz
5 6.1 = 20 fl oz 30 fl oz 40 fl oz
Wheatgrasses may be adequately controlled by
glyphosate applied in the spring. However, smooth
bromegrass requires at least fall plus preplant spring
applications of glyphosate and in-crop chemical and/or
mechanical control for adequate season-long control.
Always add AMS for improved weed control. Refer to
label for adjuvant use. Allow 14 to 21 days prior to
tillage. Glyphosate provides greater Canada thistle
control when fall-applied than spring-applied.
A4-6 R1 X1
Addition of 2,4-D: Addition of 2,4-D or will increase
alfalfa and sweet clover control but decrease grass
control. Always use AMS to overcome antagonism of
2,4-D on grass control and will improve control of
perennial weeds, such as leafy spurge and Canada
thistle. CRP grasses and forbs may become a problem
in planted crop. A1 A4-6 R1 X1
W-253, January 2008
