LibertyLink® soybeans have built-in tolerance to Liberty® Herbicide, providing excellent crop safety. Proper stewardship of Liberty® Herbicide is necessary to ensure long-term sustainability of LibertyLink® technology and to prevent the development of weed resistance in soybeans.
LibertyLink Liberty Integrated Pest Management_2013 Seed Trait Technology Manual Part 3
1. LI B E RT Y LI N K S OY B E A N S
THE LIBERTYLINK TRAIT APPLICATION INFORMATION & BEST
IN SOYBEANS WEED MANAGEMENT PRACTICES RECOMMENDATIONS FOR LIBERTYLINK SOYBEANS
• iberty herbicide with the LibertyLink trait
L Weed resistance is a serious threat to row crop
provides the most reliable weed management production. Intensive management is required to 1st Post Application
Weed Control Program 2nd Post Application
(Emergence to 14 days)
solution available. avoid or manage weed resistance, especially
• ibertyLink varieties are high-yielding, with no
L with driver weeds such as Palmer amaranth.
Use all practical means to avoid any escaped Residual pre-emergence, Liberty at 29 fl oz/A If needed, Liberty at
yield drag or lag. Scenario One
weeds going to seed in or around fields. Robust PPI or at planting plus residual herbicide 29 fl oz/A
• ibertyLink varieties have built-in tolerance
L herbicide rates, multiple modes of action and
to Liberty herbicide, providing excellent overlapping soil-applied residual herbicides Liberty at 29 fl oz/A
crop safety. Environmental conditions Liberty at 36 fl oz/A
from burndown through canopy closure are Scenario Two applied 10 days after
prevent timely application plus residual herbicide
• iberty is a nonselective contact herbicide that
L important practices. the first application
provides postemergence control of broadleaf Proper stewardship of Liberty herbicide is
and grass weeds, including weeds resistant to necessary to ensure the long-term sustainability 1. Start Clean. Start with a clean, weed-free field
4. cenario Two — Environmental Conditions
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glyphosate and multiple herbicide classes. of LibertyLink technology and to prevent the by using an effective burndown application or Prevent Timely Application:
• iberty has a unique mode of action
L development of weeds resistant to Liberty. conventional tillage. a. If environmental conditions prevent timely
(Group 10) that offers a nonselective choice Rotating crops, traits and modes of action allows Liberty application, a single application of
2. tay Clean. Use an Overlapping Residual
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for Integrated Weed Management plans. for diversity within a herbicide program and sus- up to 36 fl oz/A may be made.
Weed Control Program. Be aggressive with early
tains the longevity of any given herbicide chemis-
season weed management to avoid yield loss b. If 36 fl oz/A is used for the first application,
WHERE YOU CAN FIND try. Use cultural, mechanical and chemical weed
and weed escapes. Residual herbicides applied a second application of 29 fl oz/A should
LIBERTYLINK SOYBEANS control methods as necessary to ensure weeds
at burndown, pre-emergence and/or tankmixed be made 10 days after the first application.
• ayer CropScience has broadly licensed
B do not produce viable seed and to prevent weed
in the first post application help ensure optimal Increase water and shorten interval between
the LibertyLink trait to combine high-yielding escapes from going to seed and depositing in the
weed management, particularly if environmental post applications if canopy is heavy.
genetics with the powerful, nonselective, seed bank. Multiple practices to manage or delay
conditions delay timely post applications. Apply 5. Additives: Ammonium sulfate (AMS) can be
postemergence weed control of Liberty. herbicide resistance are essential as no single
a broad-spectrum, pre-emergence or pre-plant used at a rate of 1.5 lb/A to 3 lb/A. Rates are
strategy is totally effective.
• ibertyLink soybeans are marketed by more
L incorporated residual herbicide such as: dependent on temperature and potential for
than 100 seed companies, including HBK Seed. Authority Assist (2*, 14), Authority First (2, 14), leaf burn.
TANKMIX PARTNERS FOR LIBERTY
Enlite® (2, 14), Envive® (2, 14), metolachlor (15),
• efer to www.LinkUp.BayerCropScience.us
R ON LIBERTYLINK SOYBEANS 6. aximum Seasonal Use: Up to 65 fl oz/A
M
metribuzin (5), Prefix (14, 15), Sonic (2), Valor (14),
for more information. Assure II (1*)
®
Phoenix (14)
™ of Liberty can be applied on soybeans per
Valor XLT (2, 14) or Warrant (15). Consider
Bayer CropScience continues to collaborate with Classic® (2) Poast Plus® (1) growing season.
expected weed species and populations as
leading soybean breeding programs to develop clethodim (1) Prefix (14, 15) well as environmental variables in the area 7. Additional Use Directions:
high-yielding LibertyLink soybean varieties for Cobra® (14) Pursuit® (2) a. ake all Liberty applications 70 days before
M
when selecting a residual herbicide.
growers in the United States and Canada. Varieties FirstRate® (2) Raptor™ (2)
soybean harvest.
Fierce® (14, 15) Reflex® (14) 3. Scenario One — Residual Used
developed are widely adapted and demonstrate
Flexstar® (14) Resource® (14) Pre-emergence, PPI or At Planting: b. ake all Liberty applications before soybeans
M
yield and agronomic performance as good as or
Fusilade® DX (1) Select Max® (1) a. Apply Liberty at 29 fl oz/A over the top of
begin to bloom. Consult state Extension
better than the best available commercial checks.
Fusion® (1) Sharpen® (14) LibertyLink soybeans from emergence to 14 service for additional information on
Harmony® GT (2) Synchrony® XP (2) days after crop emergence or when weeds prebloom period for soybeans in a state.
metolachlor (15) Ultra Blazer® (14) are no more than 3 inches to 4 inches tall. c. aximum single application use rate:
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OpTill® (2, 14)
* umbers in parentheses denote herbicide MOA as designated by
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b. pply Liberty at 29 fl oz/A on an as-needed
A 36 fl oz/A.
the Weed Science Society of America. basis following the first application at 29 fl oz/A.
17 *Numbers in parentheses denote herbicide MOA as designated by the Weed Science Society of America. 18
2. LI B E RT Y LI N K S OY B E A N S
d. o not apply Liberty if soybeans show
D top 10 most frequently sprayed YIELD LOSS DUE TO COMPETITION the study shows there is a two percent yield loss
injury from prior herbicide applications or weeds in soybeans Weeds that emerge with the crop, or shortly
for every soybean leaf stage delay in applying a
environmental stress. nonselective herbicide to the crop during the
Max. Weed Confirmed thereafter, have the greatest potential to negatively
e. iberty is not labeled for application through
L critical time for weed removal.
Height with Glyphosate- affect yields. The yield loss associated with this
irrigation systems. Liberty at Resistant flush of weeds is strongly influenced by how long
29 fl oz/A1 Weeds YIELD LOSS EXAMPLES
f. Liberty-treated fields should not be grazed
weeds are allowed to remain in the field and
or used for hay. Foxtail compete with crops for light, water and nutrients. • tudies out of North Carolina State University
S
12” and the University of Georgia6 in 2012 show
(giant, green) Residual herbicides can improve weed control,
KEY APPLICATION POINTS soybean yield loss of as much as 68 percent
Lambsquarters 6” reduce problematic weeds and extend the
TO REMEMBER as a result of Palmer amaranth interference at
time period between planting and the first
Velvetleaf 4” a density of one plant per square foot.
• niform, thorough spray coverage is essential
U postemergence treatment of Liberty herbicide.
to achieve consistent performance. This allows for flexibility when weather conditions • eason-long competition by waterhemp
S
Cocklebur 14”
prevent timely postemergence applications. (more than 20 plants per square foot) reduced
• se nozzles and pressure that generate a
U soybean yields 44 percent in 30-inch rows and
Amaranth (Palmer, Additionally, using a residual herbicide in your
medium-size spray droplet. 4” ✔
redroot and tumble) weed control program introduces another 37 percent in 7.5-inch rows. Waterhemp that
• se 15 GPA (for dense canopies, increase
U herbicide mode of action in the field, improving emerged as late as the V5 soybean growth
Common
water volume). 5” ✔ your resistance management program. stage reduced yields up to 10 percent 7.
waterhemp
• aximum performance is achieved when
M According to a 2010 University of Tennessee
Giant ragweed 12” ✔ $/Bushel
applied to actively growing weeds. study4, cotton and soybean growers lost nearly
$10 $11 $12
• Apply from emergence to bloom growth stage. Morningglory 8” $138 million due to glyphosate-resistant Palmer
amaranth. Their weed control costs also increased Lost $/A* from
• equential applications should be made at
S Marestail2 6”-12” ✔ $220 $242 $264
as follows: waterhemp
10 days after the first application, prior to
bloom. Johnsongrass 5” ✔ • 78.5 million in increased herbicide costs
$ Lost $/A* from
$340 $374 $408
I
f more than 29 fl oz/A are used in any single application, see current label for
$35 per acre on 1.6 million soybean acres Palmer amaranth
• Liberty is rainfast in four hours.
1
2
additional use directions.
May require sequential applications for control.
$55 per acre on 0.4 million cotton acres
Lost $/1,000 A*
• 10 million in increased application costs
$ $22,000 $24,200 $26,400
from waterhemp
$5 per acre on 2 million acres
Lost $/1,000 A* from
• 49.35 million due to glyphosate-resistant
$ $34,000 $37,400 $40,800
Palmer amaranth
“ eople need to carefully evaluate their current programs
P weed competition
to see the selection pressure put on weeds and modify 30 percent of soybean acres at 17 percent loss *Based on a delay of 3-leaf stages resulting in a 6 percent loss of yield. Start yield at 50 bu/A.
15 percent of cotton acres at 25 percent loss
their programs to increase the diversity of their
management tactics.” A study conducted by the University of Nebraska5
-Bob Hartzler, Iowa State University determined that the critical period for weed
removal in soybeans is based upon the soybean
row spacing. For soybeans planted in 30-, 15-,
and 7.5-inch rows, the critical removal time is V3,
V2 and first trifoliate, respectively. Furthermore,
19 4,5,6,7
See page 36 for source information. 20