imprelis ® damage to trees primer
DESCRIPTION
Imprelis ® Damage to Trees Primer. What is Imprelis ® ? . A Broadleaf Herbicide for Turf and Right-of-way Use Introduced by DuPont in Spring, 2011 Active Ingredient: aminocyclopyrachlor. Why Imprelis ®. Turf Magazine - November, 2010 TURF SCIENCE New Products. - PowerPoint PPT PresentationTRANSCRIPT
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Imprelis® Damage to Trees Primer
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What is Imprelis®?
A Broadleaf Herbicide for Turf and Right-of-way Use
Introduced by DuPont in Spring, 2011
Active Ingredient: aminocyclopyrachlor
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“Control Weeds Even on Rainy Days
DuPont Imprelis herbicide...control dandelion, clover and plantains, as well as tough broadleaf weeds...even during reseeding or rainy days...a low application rate... and is the first compound in an advanced generation of herbicides.”
Why Imprelis®
Turf Magazine - November, 2010TURF SCIENCENew Products
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“Imprelis® is readily absorbed by plant leaves and roots, stopping the growth of target weeds by interfering with the hormonal balance necessary for normal shoot and root development.”
How does Imprelis® Work?
Turf Magazine - November, 2010TURF SCIENCENew Products
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Clopyralid introduced. . . as a broadleaf herbicide.
Clopyralid found in organics waste stream.
Decomposition processes in compost...did not degrade the molecule.
Compost was herbicidal.
Imprelis® related to Clopyralid
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Imprelis®
Long residual -- not biodegradable
High concentrations remain in plants
Herbicidal at very low concentrations
Recycled in grass clippings and tree leaves
Evergreen & deciduous plants affected
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What Did DuPont Do?
Introduced by DuPont in Spring, 2011
By June, 2011, damage to trees and shrubs was reported...
By end of summer 2011, Imprelis® was pulled from use
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What plants are affected?
All woody trees, shrubs, vines
Damages new growth
Spruce, honey locust, cottonwood are especially sensitive
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Symptoms of Imprelis® Damage
Dead buds, shoots, pine candles
Twisted, fused needles
Contorted, chlorotic leaves
Tumorous growths on twigs, stems
Twisted, “stretched” twig growth
Death
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Symptoms of Imprelis® Damage
Colorado Sprucedieback, galls, stem swelling
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Symptoms of Imprelis® Damage
Colorado Sprucefused needles
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Symptoms of Imprelis® Damage
Black Hills Spruce
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Symptoms of Imprelis® Damage
Norway Spruce - death
Twisted growth
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Symptoms of Imprelis® Damage
White Pine: 2011 on the left, 2012 on the right
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Symptoms of Imprelis® Damage
White Pine
Needle death, swollen twigs, galls, distorted needles
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Symptoms of Imprelis® Damage
Northern White Cedarneedle & twig deathstunted growth, galls
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Symptoms of Imprelis® Damage
Honeylocust
Leaf distortion, dieback, similar to plant bug infestation
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Symptoms of Imprelis® Damage
HoneylocustGalls on twigs,
branches and stems
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Symptoms of Imprelis® Damage
Ginkgo
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Symptoms of Imprelis® Damage
Freeman MapleDistorted terminal growth
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Symptoms of Imprelis® Damage
CottonwoodLeaf distortionTip diebackDeath of big toothed aspen
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Mitigation Measures
Prune and remove damaged growth
Chemical moves with water
. . . water moves down-hill
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Mitigation Measures
Remove all contaminated materials Including grass clippings, leaves, wood and other
plant debris until at least 2014 Burn or landfill affected yard waste
For replacement plantings Remove and replace contaminated soil Amend edges of excavation site with activated
carbon
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Compensation for Tree Loss?
Carefully document all damage: Maintenance records Dates Photos Symtomology
DuPont claim site: www.imprelis-facts.com Only through 2013
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For More Information
Imprelis® Update: 2012 Field Notes on Injury and Recovery. www.ppdl.purdue.edu.
A Turf Professional’s Guide to Suspected Imprelis® Herbicide Injury in the Landscape. www.ppdl.purdue.edu/PPDL/pubs/briefs/ImprelisLCO.pdf
MDA: [email protected]
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Questions
All Imprelis® symptoms images were generously shared by
Manuel Jordan: Heritage Shade Tree Consultants and John Lloyd: Plant Health Doctors.com