Resistance Management Spray Like You Mean It! Optimize each - - PDF document
5/2/2018 R ESISTANCE MANAGEMENT FOR E NLIST AND X TEND C ROP S YSTEMS Bryan Young CPDA 2018 A & I Conference San Antonio Resistance Management Spray Like You Mean It! Optimize each application for efficacy Integrate diverse,
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FOR ENLIST AND XTEND CROP SYSTEMS
Bryan Young
CPDA 2018 A & I Conference – San Antonio
Weed Science
Spray Like You Mean It!
Optimize each application for efficacy
Integrate diverse, effective herbicide sites of action
Multiple factors limit implementation
Use non-chemical weed control methods
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Weed Science
https://www.youtube.com/watch?v=9U5Z1MLMFAU
http://cropwatch.unl.edu/2017/spraying-new-phenoxy-herbicide-formulations-xtend-and-enlist-soybeansWeed Science
Polymer composition:
***Increase the viscosity of the spray solution***
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10 GPA 12 MPH 15 GPA 8 MPH 20 GPA 6 MPH
XTENDIMAX + ROUNDUP POWERMAX TTI11004 @ 40 PSI
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XMAX + PMAX + “water conditioner” + COC + INTACT TTI11004 @ 40 PSI
10 GPA 12 MPH 15 GPA 8 MPH 20 GPA 6 MPH 10 GPA 12 MPH 15 GPA 8 MPH 20 GPA 6 MPH
XMAX + PMAX + SELECTMAX + WARRANT + INTACT TTI11004 @ 40 PSI
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Weed Science
2” Ideal 3-4” Good 4-6” Marginal Greater than 6” Good Luck!
Weed Science
Ultra Coarse droplets from nozzles w/wo DRAs are required
for Xtend systems to manage physical spray drift.
Can be used for effective weed management, but are prone to
reduced weed control if spray coverage is compromised
Will NEVER optimize herbicide efficacy
Increasing the carrier volume to 15 or 20 GPA can regain
spray coverage.
Ultimately, the spray requirements for Xtend system are
not ideal for herbicide activity which hastens the evolution
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Weed Science
Challenging, Fragile, Expensive
Weed Science
Target Site
Altered binding site (DNA point mutation) Gene amplification for target site
Non-Target Site
Metabolism Compartmentalization Reduced translocation
Express different levels of weed resistance to herbicides Increase in low-level resistance mechanisms
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Weed Science Weed Science
MGI Soybean
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Weed Science
MGI Soybean
Weed Science
Based on # of Herbicide Site of Action Groups
Herbicide Program Group # # Effective on Waterhemp Glyphosate + 2,4-D - Burndown 9, 4 not applicable followed by Glyphosate + Xtendimax + Fierce XLT - PRE 9, 4, 2, 14, 15 3 followed by Glyphosate + Engenia + Zidua - POST 9, 4, 15 2
Total for program 5 3
Crop: Soybean (Dicamba; RR2Y Xtend) Target Weeds: Marestail (glyphosate-resistant) Waterhemp (ALS/PPO/glyphosate-resistant)
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Weed Science
Cost, complexity, and marketing programs limits
adoption of this strategy
False sense by farmers that a single herbicide can
‘fix’ resistance
Over-reliance on POST herbicides has allowed for
the evolution of low-level resistance mechanisms
Major need for soil residual herbicides!!!
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Weed Science
Spray Like You Mean It!
Optimize each application for efficacy
Integrate diverse, effective herbicide sites of action
Multiple factors limit implementation
Use non-chemical weed control methods
Weed Science
Spray Like You Mean It!
Optimize each application for efficacy
Integrate diverse, effective herbicide sites of action
Multiple factors limit implementation
Use non-chemical weed control methods Advantage when new traits allow for multiple effective
POST herbicides?
5/2/2018 11
Weed Science
Spray Like You Mean It!
Optimize each application for efficacy
Integrate diverse, effective herbicide sites of action
Multiple factors limit implementation
Use non-chemical weed control methods Advantage when new traits allow for multiple effective
POST herbicides? Maybe