Download - Imprelis ® Damage to Trees Primer
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Minnesota First Detectors
Imprelis® Damage to Trees Primer
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Minnesota First Detectors
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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Minnesota First Detectors
“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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Minnesota First Detectors
“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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Minnesota First Detectors
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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Minnesota First Detectors
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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Minnesota First Detectors
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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Minnesota First Detectors
What plants are affected?
All woody trees, shrubs, vines
Damages new growth
Spruce, honey locust, cottonwood are especially sensitive
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Minnesota First Detectors
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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Minnesota First Detectors
Symptoms of Imprelis® Damage
Colorado Sprucedieback, galls, stem swelling
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Minnesota First Detectors
Symptoms of Imprelis® Damage
Colorado Sprucefused needles
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Minnesota First Detectors
Symptoms of Imprelis® Damage
Black Hills Spruce
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Minnesota First Detectors
Symptoms of Imprelis® Damage
Norway Spruce - death
Twisted growth
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Minnesota First Detectors
Symptoms of Imprelis® Damage
White Pine: 2011 on the left, 2012 on the right
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Minnesota First Detectors
Symptoms of Imprelis® Damage
White Pine
Needle death, swollen twigs, galls, distorted needles
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Minnesota First Detectors
Symptoms of Imprelis® Damage
Northern White Cedarneedle & twig deathstunted growth, galls
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Minnesota First Detectors
Symptoms of Imprelis® Damage
Honeylocust
Leaf distortion, dieback, similar to plant bug infestation
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Minnesota First Detectors
Symptoms of Imprelis® Damage
HoneylocustGalls on twigs,
branches and stems
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Minnesota First Detectors
Symptoms of Imprelis® Damage
Ginkgo
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Minnesota First Detectors
Symptoms of Imprelis® Damage
Freeman MapleDistorted terminal growth
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Minnesota First Detectors
Symptoms of Imprelis® Damage
CottonwoodLeaf distortionTip diebackDeath of big toothed aspen
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Minnesota First Detectors
Mitigation Measures
Prune and remove damaged growth
Chemical moves with water
. . . water moves down-hill
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Minnesota First Detectors
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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Minnesota First Detectors
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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Minnesota First Detectors
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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Minnesota First Detectors
Questions
All Imprelis® symptoms images were generously shared by
Manuel Jordan: Heritage Shade Tree Consultants and John Lloyd: Plant Health Doctors.com