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Minnesota First Detectors Imprelis® Damage to Trees Primer University of Minnesota Extension Minnesota Department of Agriculture

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Imprelis ® Damage to Trees Primer. University of Minnesota Extension Minnesota Department of Agriculture. What is Imprelis ® What Does it Do?. A Broad-leaved Herbicide for Turf Use Introduced by DuPont in Spring, 2011 Active Ingredient: aminocyclopyrachlor. - PowerPoint PPT Presentation

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Page 1: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Imprelis® Damage to Trees Primer

University of Minnesota Extension

Minnesota Department of Agriculture

Page 2: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

What is Imprelis® What Does it Do?

A Broad-leaved Herbicide for Turf Use Introduced by DuPont in Spring, 2011 Active Ingredient: aminocyclopyrachlor

Page 3: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

What is Imprelis® What Does it Do?

“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.

Turf Magazine - November, 2010TURF SCIENCENew Products

Page 4: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

What is Imprelis® What Does it Do?

Turf Magazine - November, 2010TURF SCIENCENew Products

“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.”

Page 5: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

What is Imprelis® What Does it Do?

Aminocyclopyrachlor & Clopylralid Clopyralid introduced...as a broadleaf

herbicide...

Clopyralid found in organics waste stream ...

Decomposition processes in compost...did not degrade the molecule.

Compost was herbicidal.

Page 6: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

What is Imprelis® What Does it Do?

Similar to Clopyralid:

Long residual Not biodegradable High concentrations remained in plants Herbicidal impacts at very low concentrations Recycled in grass clippings/Tree leaves

Page 7: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

What Did DuPont Do?

By June, 2011, damage to trees and shrubs was reported...

By end of summer, Imprelis® was pulled from use

Page 8: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Evergreen and deciduous... Dead buds, shoots, pine candles... Twisted, fused needles... Contorted, chlorotic leaves... Tumorous growths on twigs, stems... Twisted, “stretched” twig growth... Death

Page 9: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Colorado Spruce

Page 10: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Colorado Spruce

Page 11: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Black Hills Spruce

Page 12: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Norway Spruce

Page 13: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

White Pine: 2011 on the left, 2012 on the right

Page 14: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

White Pine

Page 15: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Northern White Cedar

Page 16: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Honeylocust

Page 17: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Honeylocust

Page 18: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Ginkgo

Page 19: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Freeman Maple

Page 20: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Symptoms of Imprelis® Damage

Cottonwood

Page 21: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Susceptible Plants?

To Date: all woody trees, shrubs, vines

Page 22: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Treatments? Avoidance?

Damage is to new growth

Prune and remove damaged growth

Chemical moves with water...water moves down-hill

Page 23: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Treatments? Avoidance?

Remove all contaminated materials Capture and remove grass clippings, leaves,

wood and any other plant debris that might be contaminated through at least 2014

Replace contaminated soil As much as you can around the new planting site Amend existing soil remaining around the edges

with activated carbon

Page 24: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Compensation for Tree Loss?

Carefully document all damage: Maintenance records Dates Photos Symtomology

DuPont claim site: www.imprelis-facts.com

Page 25: Imprelis ® Damage to Trees Primer

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

http://www.ppdl.purdue.edu/
http://www.ppdl.purdue.edu/PPDL/pubs/briefs/ImprelisLCO.pdf
http://www.ppdl.purdue.edu/PPDL/pubs/briefs/ImprelisLCO.pdf
Page 26: Imprelis ® Damage to Trees Primer

Minnesota First Detectors

Acknowledgement

All Imprelis® symptoms images were generously shared by:

Manuel Jordan: Heritage Shade Tree Consultantsand

John Lloyd: Plant Health Doctors.com


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