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Imprelis ® Damage to Trees Primer

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.

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Imprelis ® Damage to Trees Primer

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  1. Imprelis® Damage to Trees Primer University of Minnesota Extension Minnesota Department of Agriculture

  2. What is Imprelis® What Does it Do? • A Broad-leaved Herbicide for Turf Use • Introduced by DuPont in Spring, 2011 • Active Ingredient: aminocyclopyrachlor

  3. What is Imprelis® What Does it Do? Turf Magazine - November, 2010 TURF SCIENCE New Products “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.

  4. What is Imprelis® What Does it Do? Turf Magazine - November, 2010 TURF SCIENCE New 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.”

  5. 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.

  6. 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

  7. What Did DuPont Do? By June, 2011, damage to trees and shrubs was reported... By end of summer, Imprelis® was pulled from use

  8. 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

  9. Symptoms of Imprelis® Damage Colorado Spruce

  10. Symptoms of Imprelis® Damage Colorado Spruce

  11. Symptoms of Imprelis® Damage Black Hills Spruce

  12. Symptoms of Imprelis® Damage Norway Spruce

  13. Symptoms of Imprelis® Damage White Pine: 2011 on the left, 2012 on the right

  14. Symptoms of Imprelis® Damage White Pine

  15. Symptoms of Imprelis® Damage Northern White Cedar

  16. Symptoms of Imprelis® Damage Honeylocust

  17. Symptoms of Imprelis® Damage Honeylocust

  18. Symptoms of Imprelis® Damage Ginkgo

  19. Symptoms of Imprelis® Damage Freeman Maple

  20. Symptoms of Imprelis® Damage Cottonwood

  21. Susceptible Plants? • To Date: all woody trees, shrubs, vines

  22. Treatments? Avoidance? • Damage is to new growth • Prune and remove damaged growth • Chemical moves with water...water moves down-hill

  23. 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

  24. Compensation for Tree Loss? • Carefully document all damage: • Maintenance records • Dates • Photos • Symtomology • DuPont claim site: www.imprelis-facts.com

  25. 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

  26. Acknowledgement All Imprelis® symptoms images were generously shared by: Manuel Jordan: Heritage Shade Tree Consultants and John Lloyd: Plant Health Doctors.com

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