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2008 North Dakota Weed Control Guide
W-253, January 2008
R. K. Zollinger, NDSU Extension Weed Specialist
SUNFLOWER
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. Refer to pages 108-109 for commercial
mixtures. A4-6 X1
Paraquat
RUP
| 2 to 4 pt 2SL
1.3 to 2.7 pt 3SL
(0.5 to 1 lb)
| Non-residual, contact, herbicides; thorough coverage
required.
Apply with NIS at 0.25% v/v to small weeds.
Thorough coverage essential.
B5 S1 S3-4 Q3 X1
Aim
(carfentrazone)
| 1/2 to 1 fl oz EW
(0.128 to 0.256 oz)
| Small broadleaf
weeds.
Eptam
(EPTC)
| 2.5 to 3.5 pt
(2 to 3 lb)
| Grass and some
broadleaf weeds.
| PPI.
| No wild mustard control. PPI immediately after
application. A1-3 E2 J1 J3
Prowl
Prowl H2O
(pendimethalin)
| 2.4 to 3.6 pt 3.3EC
2.1 to 3 pt 3.8ACS
(1 to 1.5 lb)
| PPI.
| No wild mustard and poor wild oat control.
Adjust rate according to soil type.
Refer to narrative for tank-mix options and rotational
restrictions. A1 D13 X1 Y1 Y6-7 Y18 Y24
For use in no-till sunflower only.
3 to 3.6 pt 3.3EC
2.7 to 3 pt 3.8ACS
(1.25 to 1.5 lb)
| PRE - 30 days
before to 1 day
after seeding.
| Trifluralin
| 1 to 2 pt EC
5 to 10 lb 10G
(0.5 to 1 lb)
| PPI.
| No wild mustard and poor wild oat control. PPI within
24 hours after application.
A1 D13 J1 S7 X1 Y1 Y18 Y24
Sonalan
(ethalfluralin)
| 1.5 to 3 pt EC
5.5 to 11.5 lb 10G
(0.55 to 1.15 lb)
| PPI.
Spring.
Fall: From October
1 to December 31.
| No wild mustard and poor wild oat control.
Adjust rate according to soil type.
Use highest rate allowed for nightshade control.
Refer to narrative for rotational restrictions.
A1 D13 J1 X1 Y18 Y24
7.5 to 11.5 lb 10G
(0.75 to 1.15 lb)
| Foxtail.
| For use in reduced or conservation tillage. Incorporate
twice at 2 to 3 inches deep using a V-blade under-cutter or rotary hoe. For fall applications, incorporate
once in the fall and once in the spring before seeding.
A3 J1 Y18 Y24
Dual Magnum
(s-metolachlor)
| 1 to 2 pt
(0.95 to 1.9 lb)
| Grass and some
broadleaf weeds.
| PPI or PRE.
| No wild oat or wild mustard control. PPI improves
consistency of control. Requires moisture for
activation. A1 C11 D8 E3
Spartan
(sulfentrazone)
| 3 to 8 fl oz F
(1.5 to 4 oz)
| Small-seeded
broadleaf weeds
including kochia,
pigweed,
lambsquarters,
nightshade, and
biennial
wormwood.
| EPP, shallow PPI,
PRE or fall.
| Requires precipitation for activation. EPP applications
up to 30 days prior to planting improves likelihood of
activation by moisture. Adjust rate to soil type.
Provide adequate furrow closure at planting.
Temporary sunflower injury may occur in coarse, low
organic matter soils with pH greater than 7.8. May give
6 to 8 weeks residual weed control. Refer to narrative
for application information, crop rotation restrictions,
and other information. Refer to pages 108-109 for
commercial mixtures.
D14 J1 J3 S1 S4-5 S7 Y19 Y24
Assert
(imazamethabenz)
| 0.6 to 0.8 pt
(0.19 to 0.25 lb)
| Wild mustard.
| POST.
Sunflower: Less
than 8 leaves or 15
inches.
Mustard species
including canola:
Prior to bloom.
| Sunflower injury may occur when applied at high
temperature and humidity.
Refer to narrative for rotational restrictions.
Apply with NIS at 0.25% v/v.
J1-2 Y2 Y6 Y24 | | | | | | | | | | | | |
SUNFLOWER
Herbicide
| Product/A
(ai/A)
|
Weeds
|
When to Apply
|
Remarks and Paragraphs
Assure II
Targa
(quizalofop)
| 8 to 10 fl oz
(0.88 to 1.1 oz)
| Annual grasses
and quackgrass.
| POST.
Sunflower:
Refer to PHI.
Grass: Refer to
soybean section
on page 26.
| Apply with oil adjuvant at 1% v/v but not less than 1
pt/A. Oil adjuvant at more than 1 qt/A is not needed.
See Select Max label for detailed adjuvant
recommendations.
Refer to soybean section, label, or narrative for tank-mix options, possible grass antagonism with broadleaf
herbicides, and avoiding reduced grass control.
Allow a 70 day PHI.
D3 J1 X1
Poast
(sethoxydim)
| 0.5 to 1.5 pt
(0.1 to 0.3 lb)
| Annual grasses.
| Clethodim
| 4 to 8 fl oz
(1 to 2 oz)
| Annual grasses
and quackgrass.
Select Max
(clethodim)
| 9 to 32 fl oz
(1.125 to 4 oz)
Preharvest Application
Glyphosate
| Up to 0.75 lb ae
See Remarks.
| Preharvest weed
control.
| Backside of
sunflower heads
yellow and bracts
turning brown.
Seed moisture
content under
35%.
| Apply with AMS fertilizer. Only certain formulations are
labeled. Allow 7 days between application and harvest
or livestock feeding. Refer to label for adjuvant use.
A4-6
Paraquat
RUP
| 1.5 to 2 pt 2SL
1 to 1.35 pt 3SL
(0.375 to 0.5 lb)
| Desiccant.
| For use on confectionery and oilseed varieties.
Apply with NIS.
Randomly sample 10 average heads for seed
moisture. Allow a 7 day PHI.
Q3 | | | | | | | |
HERBICIDE RESISTANT SUNFLOWER
CLEARFIELD SUNFLOWER
Herbicide
| Product/A
(lb ai/A)
|
Weeds
|
When to Apply
|
Remarks and Paragraphs
Beyond
(imazamox)
| 4 fl oz
(0.5 oz)
| Annual broadleaf
weeds including
wild mustard and
black nightshade.
No ALS-resistant
kochia control.
| EPOST.
Sunflower: 2 to 8-leaf stage.
Broadleaf weeds:
Less than 3 inches
tall.
Grass weeds: Less
than 4 to 5 leaves.
| Apply only to Clearfield sunflower varieties.
Apply with NIS at 0.25% v/v + UAN at 2.5% v/v. MSO
and oil adjuvants are not prohibited but may increase
activity of Beyond to cause temporary crop injury.
Can be applied following a labeled soil-applied grass
herbicide. Refer to label for weeds controlled, adjuvant
use, tank-mix options, crop rotation restrictions and
additional information. A7 J1 J4 S3 S4 Y1-2 Y24 | |
EXPRESS SUN SUNFLOWER
Herbicide
| Product/A
(lb ai/A)
|
Weeds
|
When to Apply
|
Remarks and Paragraphs
| Tribenuron
|
0.25 to 0.5 oz SG
(0.125 to 0.25 oz)
| Annual broadleaf
weeds including
wild mustard.
Control or
suppression of
Canada thistle.
No grass or ALS-resistant kochia
control.
| EPOST.
Sunflower: 1-leaf
stage but prior to
bud formation.
Broadleaf weeds:
Less than 3 inches
tall.
| Apply only to Express Sun sunflower varieties.
Apply with MSO-type oil adjuvants at 1% v/v. NIS or
petroleum oil adjuvants are not prohibited.
Apply following a labeled soil-applied grass herbicide
or with a registered POST grass herbicide. Sequential
applications are allowed but observe a 14 day interval
between applications and do not exceed 1 oz/A. Allow
a 70 day PHI. Refer to label for weeds controlled and
additional information. A7 J1 J5 S3 T2 Y1-2 Y24 | |
SAFFLOWER
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. A4-6 X1
Paraquat
RUP
| 2.5 to 4 pt 2SL
1.7 to 2.7 pt 3SL
(0.63 to 1 lb)
| Emerged annual
grass and
broadleaf weeds.
| Non-residual, contact, herbicides; thorough coverage
required.
Apply with NIS at 0.25% v/v to small weeds.
B4 S1 S3-4 Q3 X1
Eptam
(EPTC)
| 3.5 pt EC
15 lb 20G
(3 lb)
| Grass and some
broadleaf weeds.
| PPI.
| Refer to incorporation discussion in narrative for
details.
Poor wild mustard and wild oat control.
A1-2 E2
| Trifluralin
| 1 to 2 pt EC
5 to 10 lb 10G
(0.5 to 1 lb)
| PPI.
Fall or spring.
| No wild mustard and poor wild oat control.
Adjust rate according to soil type.
Use highest rate allowed for nightshade control.
Refer to narrative for rotational restrictions.
A1 D13 S7 X1 Y18 Y24
Sonalan
(ethalfluralin)
| 1.5 to 3 pt EC
5.5 to 11.5 lb 10G
(0.55 to 1.15 lb)
| PPI.
Fall or Spring.
Metolachlor
s-Metolachlor
| 1 to 2 pt
(0.95 to 1.9 lb)
| PPI or PRE.
| S-metolachlor may give greater weed control than
metolachlor at equal product rates.
Poor wild mustard and wild oat control.
PPI gives more consistent weed control.
A1 C11 D8 E3
Poast
(sethoxydim)
| 0.5 to 1.5 pt
(0.1 to 0.3 lb)
| Annual grasses.
| POST.
Safflower:
Refer to PHI.
Grass weeds:
Refer to soybean
section on page
26.
| Apply with oil adjuvant at 1% v/v but not less than 1
pt/A. Oil adjuvant at more than 1 qt/A is not needed.
See Select Max label for detailed adjuvant
recommendations.
Refer to soybean section, label, or narrative for tank-mix options, possible grass antagonism with broadleaf
herbicides, and avoiding reduced grass control.
Allow a 70 day PHI.
D3 J1 X1
| Clethodim
| 4 to 8 fl oz
(1 to 2 oz)
| Annual grasses
and quackgrass.
Select Max
(clethodim)
| 9 to 16 fl oz
(1.125 to 2 oz)
Preharvest Application
Glyphosate
| Up to 2.25 lb ae
See Remarks.
| Preharvest weed
control.
| When seed coat
turns white, at
least 20 days after
end of flowering on
secondary
branches.
| Apply with AMS fertilizer. Only certain formulations are
labeled. Allow 7 days between application and harvest
or livestock feeding. Refer to label for adjuvant use.
A4-6
Drexel Defol
(sodium chlorate)
| 1 gal 6SL
(6 lb)
| Desiccant.
| After physiological
maturity and 7 day
PHI.
| Contact herbicide; thorough coverage required.
Apply aerially at 5 to 10 gpa or by ground at 20 to 30
gpa. Most active with warm, sunny conditions. | | | | | | | | | | | | |
FLAX
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. A4-6 X1
Aim
(carfentrazone)
| 1/2 to 1 fl oz EW
(0.128 to 0.256 oz)
| Small broadleaf
weeds.
| Contact herbicide; thorough coverage required. Apply
with NIS at 0.25% v/v to small weeds.
B4 S1 S3-4 Q3 X1
| Trifluralin
| 1 to 2 pt
5 to 10 lb 10G
(0.5 to 1 lb)
| Grass and some
broadleaf weeds.
| PPI.
Fall.
| Adjust rate for soil texture. Deep incorporate within 24
hours after application. Keep spring tillage depth
shallower than fall and plant shallow.
A1 D13 K1 K5 S7 X1 Y18 Y24
| Bromoxynil
| 1 pt
(0.25 lb)
| Small broadleaf
weeds.
| Flax: 2- to 8-inches
tall.
| Poor wild mustard control. Good buckwheat control.
Flax injury is possible. K1 K2
| MCPA
| 0.5 pt 4EC/SL
(0.25 lb)
| Use MCPA ester on hard-to-kill weeds.
Early application is less injurious to flax. K1 K4
| Bromoxynil &
MCPA
| 0.9 pt 4EC
11.4 fl oz 5EC
(0.23 & 0.23 lb)
| Apply to small weeds prior to bud stage of flax.
Risk of flax injury.
Refer to pages 108-109 for commercial mixtures.
K1-2 K4
Clopyralid &
MCPA
| 1.33 to 1.75 pt
(1.1 to 1.5 &
6.25 to 8.25 oz)
| Broadleaf weeds
including Canada
thistle and
per. sowthistle.
| POST. Flax: 2- to
6-inches tall.
Canada thistle:
4- to 6-inches tall.
| Apply after most thistle shoots have emerged.
Allow a 72 day PHI. Follow rotational crop interval and
other precautions on product label.
K1 K3 T2 Y20 Y24
Assure II
Targa
(quizalofop)
| 8 to 10 fl oz
(0.88 to 1.1 oz)
| Annual grasses
and quackgrass.
| POST.
Flax:
Refer to PHI.
Grass: Refer to
soybean section
on page 26.
| Apply with oil adjuvant at 1% v/v but not less than 1
pt/A. Oil adjuvant at more than 1 qt/A is not needed.
See Select Max label for detailed adjuvant
recommendations. May be tank-mixed with bromoxynil
or MCPA ester for broad-spectrum weed control.
Refer to soybean section, label, or narrative for tank-mix options, possible grass antagonism with broadleaf
herbicides, and avoiding reduced grass control.
Allow a 75 day PHI for Poast and 60 day PHI for
clethodim. Refer to label for PHI of Assure II/Targa.
Clethodim may injure flax when applied during bloom.
D3 K1 X1
Poast
(sethoxydim)
| 0.5 to 1.5 pt
(0.1 to 0.3 lb)
| Annual grasses.
| Clethodim
| 4 to 8 fl oz
(1 to 2 oz)
| Annual grasses
and quackgrass.
Select Max
(clethodim)
| 9 to 16 fl oz
(1.125 to 2 oz)
Preharvest Application
| Glyphosate
| Up to 0.75 ae
See Remarks.
| Emerged grass
and broadleaf
weeds including
Canada thistle and
perennial
sowthistle.
| Flax:
Physiologically
mature.
Seed contains
30% or less
moisture.
| Only certain formulations are labeled. See label.
Allow a 7 day PHI. Do not apply to flax grown for
seed because reduced germination/ vigor may
occur. A4-6 Q1
Drexel Defol
(sodium chlorate)
| 1 gal 6SL
(6 lb)
| Desiccant.
| 70 to 80% of the
bolls should be
brown.
| Contact herbicides; thorough coverage required. Do
not graze or feed treated straw. Allow a 7 day PHI. | | | | | | | | | | | | | | |
CANOLA, RAPESEED, AND CRAMBE
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
| Trifluralin
| 1 to 2 pt
5 to 10 lb 10G
(0.5 to 1 lb)
| Grass and some
broadleaf weeds.
| PPI.
Spring or Fall.
| Use only 1 to 1.5 pt/A on tame mustard varieties.
Adjust rate according to soil type. Use only labeled
formulations on crambe.
D13 K5 L1 S7 Y1 Y18 Y24
Sonalan
(ethalfluralin)
| 1.5 to 2.5 pt
5.5 to 9.5 lb 10G
(0.55 to 0.95 lb)
| Grass and some
broadleaf weeds.
May control or
suppress ALS-
resistant kochia.
| PPI.
Fall or Spring.
| Adjust rate for soil type.
No wild mustard and poor wild oat control.
May result in reduced crop stand or early injury.
May provide greater broadleaf weed control than
trifluralin.
D13 L1 S7 Y18 Y24
| Clopyralid
| 4 to 8 fl oz
(1.5 to 3 oz)
| Broadleaf weeds
including Canada
thistle and
perennial
sowthistle.
| POST.
Crop: 2- to 6-leaves.
Annual weeds:
Small.
Thistle: 4 to 6
inches tall.
| Apply after most thistle shoots have emerged.
Allow 7 days after application to graze or harvest
treated crambe for livestock forage. Allow a 50 day
PHI. Follow rotational crop interval and other
precautions on product label.
L1-2 T2 Y20 Y24
Assure II
Targa
(quizalofop)
| 8 to 10 fl oz
(0.88 to 1.1 oz)
| Annual grasses
and quackgrass.
| POST.
Crop: Refer to PHI.
Clethodim: Prior to
bolting.
Grass weeds:
Refer to soybean
section on page
26.
| Apply with oil adjuvant at 1% v/v but not less than 1
pt/A. Oil adjuvant at more than 1 qt/A is not needed.
See Select Max label for detailed adjuvant
recommendations.
Avoid drift to small grain and desirable grass species.
Clethodim may injure canola when applied during
bloom.
Allow a 60 day PHI for Assure II and Poast.
Allow a 70 day PHI for clethodim.
L1 D3 X1
Poast
(sethoxydim)
| 1 to 1.5 pt
(0.2 to 0.3 lb)
| Clethodim
| 4 to 6 fl oz
(1 to 1.5 oz)
Select Max
(clethodim)
| 9 to 16 fl oz
(1.125 to 2 oz)
TAME MUSTARD
| Trifluralin
| 1.5 pt
7 lb 10G
(0.5 to 1 lb)
| Grass and some
broadleaf weeds.
| PPI.
Spring or Fall.
| Adjust rate according to soil type.
D13 K6 L1 Y1 Y18 Y24
| Clethodim
| 4 to 6 fl oz
(1 to 1.5 oz)
| Annual grasses
and quackgrass.
| POST.
Crop: Prior to
bolting and allow a
70 day PHI.
Grass weeds:
Refer to soybean
section.
| Apply with oil adjuvant at 1% v/v but not less than 1
pt/A. Oil adjuvant at more than 1 qt/A is not needed.
See Select Max label for detailed adjuvant
recommendations.
Avoid drift to small grain and desirable grass species.
L1 D13 X1
Select Max
(clethodim)
| 9 to 16 fl oz
(1.125 to 2 oz)
| | | | | | | | | | | | |
HERBICIDE-RESISTANT CANOLA
CLEARFIELD CANOLA
Herbicide
| Product/A
(ai/A)
|
Weeds
|
When to Apply
|
Remarks and Paragraphs
Beyond
(imazamox)
| 4 fl oz
(0.5 oz)
| Annual grass and
broadleaf weeds.
| POST.
Canola: Prior to
bloom.
Grass and
broadleaf weeds:
Small.
| Apply only to Clearfield canola varieties.
Apply with NIS at 0.25% v/v plus UAN at 1 to 2 qt/A.
Apply with Stinger for improved Canada thistle control.
Refer to label for weeds controlled, application
information, and crop rotation restrictions.
Will not control ALS-resistant kochia.
Allow a 60 day PHI.
A7 L1 L3 X1 Y2 Y24 | |
LIBERTY LINK CANOLA
Herbicide
| Product/A
(ai/A)
|
Weeds
|
When to Apply
|
Remarks and Paragraphs
| Liberty
(glufosinate)
| 28 to 34 fl oz
(0.37 to 0.44 lb)
| Annual broadleaf
weeds and control
or suppression of
grasses.
| POST. Canola:
Cotyledon up to
early bolting stage.
Broadleaf weeds:
Up to 3 inches tall.
Grass weeds:
See Remarks.
| Apply only to Liberty Link canola varieties. Use low
rate when tank-mixing with a POST grass herbicide.
Apply with AMS fertilizer at 3 lb/A. Allow a 65 day PHI.
Growth stage of grass weeds at application:
Grass weed # leaves Inches tall # tillers
Green foxtail 1 to 6 <4 2 or less
Yellow foxtail 1 to 4 <2
Prior to tillering
Wild oat* 1 to 4 <4 1 or less
Barnyardgrass 1 to 6 <3 1 or less
Proso millet 1 to 6 <3 1 or less
Vol. wheat* 1 to 4 <4 1 or less
Vol. barley* 1 to 3 <3 ---
Vol. corn 1 to 4 <6
---
* = A second application may be required.
Refer to label for additional information.
Liberty is a non-residual, contact herbicide.
A7 L1 L4 S7 X1 | |
ROUNDUP READY CANOLA
Herbicide
| Product/A
(ae/A)
|
Weeds
|
When to Apply
|
Remarks and Paragraphs
| Glyphosate
| Maximum single
application =
0.38 lb ae
Maximum in-crop
= 0.75 lb ae
See Remarks.
| Annual and
perennial grass
and broadleaf
weeds.
| Canola:
Emergence to
bolting -
(5- to 6-leaf).
Do not apply after
the 6-leaf stage or
once bolting
begins because
canola injury may
occur.
Apply once or
twice as needed.
| Apply only to Roundup Ready canola varieties.
Maximum - Maximum -
single appl. season
3 4 = 1.5 pt 2 pt
4/4.17 5.4/5.1 = 1.12 pt 1.5 pt
4.5 5.5 = 1 pt 1.33 pt
5 6.1 = 15 fl oz 1.25 pt
Apply with AMS fertilizer. Sprayer overlap may result
in yellowing, delayed flowering, and growth reduction.
Allow a minimum interval of 10 days between
applications. Allow an 8 week PHI. Avoid drift.
Refer to label for additional application information.
Refer to page 126 for control of volunteer RUR canola.
A4-6 L5 X1 | |
Refer to page 126 for control of volunteer Roundup Ready canola, corn and soybean.
Continue to next page
W-253, January 2008
|
