annual weed management - corn · annual weed management author: uwxjdb created date: 2/4/2012...
TRANSCRIPT
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Herbicide Resistance
What’s the Big Deal?
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What’s the big deal?
Thoughts to consider: • It’s not on my farm,…………it’s not my
problem
• If I get it,………………..someone (industry) will give me new tools to fix it
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What’s the Big Deal?
No new herbicide Modes-of-Action in the last 20 years
• last new MOA was HPPD’s
Increasing concern and lack of availability of older herbicides (i.e. atrazine)
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Why have no new herbicide modes of action appeared in recent years?
1. Glyphosate-Resistant (GR) crops have reduced the market potential for a new herbicide
2. GR crops led to significantly diminished herbicide discovery efforts
3. Company consolidations
4. The availability of more ‘generic’ herbicides
5. The best herbicide molecular target sites may have already been discovered
Stephen O Duke; Pest Manag Sci. 2011, DOI 10.1002/ps.2333
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Stephen O Duke; Pest Manag Sci. 2011, DOI 10.1002/ps.2333
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Stephen O Duke; Pest Manag Sci. 2011, DOI 10.1002/ps.2333
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What is Resistance? Definitions Susceptibility: Plant injury/death caused by a herbicide at acceptable use rates – the inherent plant response to a herbicide Tolerance: The ability of a plant population to remain uninjured at the herbicide at acceptable use rates – the inherent lack of plant response to a herbicide Resistance: The change in a plant population from a population that is initially predominantly susceptible to a population that is predominantly “tolerant” – the loss of effectiveness of a herbicide due to the evolution of resistance in a weed population
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Definitions Resistance: The change in a plant population from a population that is initially predominantly susceptible to a population that is predominantly “tolerant” – the loss of effectiveness of a herbicide due to the evolution of resistance in a weed population. Cross Resistance: Resistance develops to two or more herbicides with the same mode of action. Multiple Resistance: Resistance develops to two or more herbicides from different chemical families with different modes of action.
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How do weeds become resistant?
A population equilibrates that exhibits… • An altered site of action, • Enhanced metabolism, • Reduced uptake (foliar or root), • Reduced translocation
–Compartmentalization – Sequestration/conjugation –Other
• Other
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Hypothetical Development of High-Level vs. Low-Level Resistance
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‘Official’ source: International
Survey of Herbicide Resistant Weeds
www.weedscience.com
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Timeline of herbicide resistance
• Before 1982 how many resistant weed biotypes?
– Approx. 35 species
• Between 1982 and 1990 the number of resistant weed biotypes increased by what factor?
– Tripled = 107 species
• From 1990 to 1995 the number of resistant weed biotypes increased by what factor?
– Doubled = 214 species
• Presently – 372 weed species resistant to herbicides
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Glyphosate- resistant weeds
Followed Glyphosate-resistant crops
Glyphosate-resistant (Roundup Ready®)
released in 1996
• Clean fields were common
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Glyphosate use in soybean
Glyphosate-resistant soybean
Glyphosate use in corn
Glyphosate-resistant corn
Glyphosate use in cotton
Glyphosate-resistant cotton
Johnson et al. 2009. EJA
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So what happened?
• Reduction in residual herbicide use
• Delayed postemergence herbicide applications
• No or minimal cost reductions
• Glyphosate-resistant weeds…..
Preplant residual herbicide
advertisement in the 1980 (Volume 12)
publication of Weeds Today
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Evolving yield robbers….
Davis, V.M.
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Horseweed (Conyza canadensis)
Davis, V.M.
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Davis, V.M.
Giant Ragweed (Ambrosia trifida)
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Davis, V.M.
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Common Waterhemp (Amaranthus rudis) • Resistant to 5 herbicide Mode-of-Actions!
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Palmer amaranth in cotton
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Anyone looking for work?
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Palmer amaranth
(Amaranthus palmeri) is in
Wisconsin Crop Production Fields
Wisconsin Crop Manager article
10/13/11
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Keep your eye on the ‘BALL’
• Not just concerned about glyphosate resistance
• Resistance to HPPD inhibitors ! ? !
• Callisto, Impact and Laudis
– Newest mode of action (MOA) on market
• Latest MOA with confirmed resistance in U.S.
• HPPD resistant waterhemp in Iowa, Illinois
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Resistance, what to look for
• Most of the time resistance is not detected until there is a large problem (more than one control failure)
• Early warning signs: – Only one weed species escapes control
– Plants will have a wide range of response to the herbicide • often dead plants next to alive plants, especially look for
large dead plants next to small, injured alive plants
• Injured plants with rapid regrowth
– Arrangement of weed escapes in the field do not match to field equipment widths
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Of most concern in WI: Glyphosate-Resistant Giant Ragweed
• Others in the running
– Lambsquarters
– Waterhemp
– Palmer amaranth?
– Shattercane?
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States with Confirmed Glyphosate-Resistant Giant Ragweed
Multiple resistance to glyphosate and ALS-inhibitors
(Heap 2012, www.weedscience.org)
? 2004
2005
2005
2006
2006 2008
2006
2007
2009
2009
2010
2010
Dr. Dave Stoltenberg
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Giant Ragweed (Ambrosia trifida)
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Sensitive Noble county 0.75 lb ae/A – 21 DAT
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Sensitive Noble county 3.0 lb ae/A – 21 DAT
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Is giant ragweed resistant to glyphosate in Wisconsin?
http://www.dot.wisconsin.gov/travel/maps/county.htm Dr. Dave Stoltenberg
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Grant County Giant Ragweed September 2009
Dr. Dave Stoltenberg
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Is giant ragweed resistant to glyphosate in Wisconsin?
http://www.dot.wisconsin.gov/travel/maps/county.htm Dr. Dave Stoltenberg
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Rock County Giant Ragweed July 2010 Dr. Dave Stoltenberg
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Dose-Response Experiments
• Conducted under greenhouse conditions
• Grant County (GC) and Rock County (RC) giant ragweed – Suspected resistant (R) plants
– Sensitive (S) plants
• Glyphosate applied at seven doses (rates) + AMS – 0.1 to 16.8 kg ae ha-1
– Non-treated check plants
– 15 ± 5 cm-tall plants
• Shoot injury, height, and mass measured 4 WAT
• Experiment repeated
Dr. Dave Stoltenberg
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Grant County (GC) and Rock County (RC) Giant Ragweed Response to Glyphosate
Glyphosate dose (kg ae ha-1)
Sh
oo
t d
ry m
as
s
(%
of
no
ntr
ea
ted
pla
nts
)
0.01 0.1 1 10 1000
25
50
75
100
125GC-R
GC-S
RC-R
RC-S
0
Shoot dry mass of non-treated plants for each accession relative to the mean of all non-treated plants Dr. Dave Stoltenberg
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Grant County (GC) and Rock County (RC) Giant Ragweed Response to Glyphosate
Glyphosate dose (kg ae ha-1)
Sh
oo
t d
ry m
as
s
(%
of
no
ntr
ea
ted
pla
nts
)
0.01 0.1 1 10 1000
25
50
75
100
125GC-R
GC-S
RC-R
RC-S
0
Upper limit (D)
Lower limit (C)
Effective Dose (ED50)
Dr. Dave Stoltenberg
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Dose-Response Parameters for Giant Ragweed from Grant County (GC) and Rock County (RC)
Dose-Response Model Parameter†
ED50 R:S Accession D C ED50
% of non-treated plants kg ae ha-1
GC-R 104.9 a‡ 10.1 a 0.148 a NS§
GC-S 96.0 a 9.1 a 0.073 a
RC-R 104.9 a 6.3 a 0.787 b 9.3
RC-S 103.7 a 9.4 a 0.085 a
†D = upper asymptote C = lower asymptote ED50 = effective dose that reduced shoot mass by 50% relative to non-treated plants ‡Means followed by the same letter do not differ at the 5% level of significance §NS = not significant
Dr. Dave Stoltenberg
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Rock County Giant Ragweed 3.0 lb ae/acre glyphosate
4 WAT
RC-S RC-R Dr. Dave Stoltenberg
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Rock County Giant Ragweed 3.0 lb ae/acre glyphosate
4 WAT
RC-R Dr. Dave Stoltenberg
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Of most concern in WI: Glyphosate-Resistant Giant Ragweed
• IT IS NOW CONFIRMED !
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Glyphosate-Resistant Giant Ragweed Confirmed in Wisconsin
Multiple resistance to glyphosate and ALS-inhibitors
2004
2005
2005
2006
2006 2008
2006
2007
2009
2009
2010
2010
2011
Dr. Dave Stoltenberg
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Additional site in 2011 with suspected glyphosate-resistant giant ragweed
http://www.dot.wisconsin.gov/travel/maps/county.htm Dr. Dave Stoltenberg
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Is Wisconsin giant ragweed resistant to glyphosate?
• Grant County giant ragweed – Results do not suggest resistance at accession level – Variable response to glyphosate among plants
• Rock County giant ragweed – Nine-fold level of resistance to glyphosate – Current research determining sensitivity of enzyme target
site (EPSPS) to glyphosate
• Columbia County giant ragweed – Seed collected in Fall 2011 – Research initiated to determine plant response to
glyphosate and ALS-inhibitors
Dr. Dave Stoltenberg
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Giant ragweed management
• One-pass programs –WILL NOT WORK
• Start with clean field, Use a residual herbicide
• In soybean 1. Use a PRE PPO + cloransulam (Authority First/Sonic;
Gangster)
2. Use a PRE PPO + imazethapyr (Authority assist, Optill) or PRE PPO + PSII (Authority MTZ or Lorox) or PRE PPO + seedling shoot inhibitor (Prefix)
• Follow all pre programs with TIMELY postemergence applications!
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Giant ragweed management
• In corn
Use a PRE triazine + acetanilide + HPPD
Followed by: Glyphosate + …….
HPPD and/or triazine and/or ALS and/or growth regulator (Callisto Xtra, Halex, Laudis, Capreno, Status, Northstar, Yukon)
• Spray postemergence applications TIMELY!
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Giant ragweed management • Spray postemergence applications TIMELY!
Herbicide Rate (per acre)
Giant ragweed height –Maximum (inches)
Roundup Powermax 22 fl oz 32 fl oz
12 18
Ignite 280 22 fl oz 29 fl oz
6 12
Callisto Callisto Xtra
3 fl oz 24 fl oz
2 10
Capreno 3 fl oz 6
Halex GT 3.6 pt 4
FirstRate 0.3 oz 10
Flexstar GT 3.5 3.5 pt 4.5 pt
4 gly-sus 2 gly-res 6 gly-sus 2 gly-res