Documenting suspected Imprelis injury

Keep photos, application records and samples if you have damaged trees.

Reports and photos of trees with suspected Imprelis damage continue to come in. As noted on MSU Extension News for Agriculture and on many other Extension websites, spruces and white pines in landscapes and on golf courses are showing severe needle and shoot injury (see photos) following application of Imprelis herbicide to adjacent turf. (See related article, What to do with Imprelis-affected trees). DuPont issued a statement on June 17 advising applicators to avoid using Imprelis near Norway spruce and white pine trees, but has not provided any further information beyond a notice on their website that they are investigating claims of injury to trees.

Suspected Imprelis injury on Norway spruce
Suspected Imprelis injury on Norway spruce on a golf course
near Ann Arbor. Photo credit: Don Wild

Suspected Imprelis injury on Norway spruce
Suspected Imprelis injury on Norway spruce. Photo credit: Don Wild
Click here to see close-up of image.

Landscapers, lawn service operators and golf course managers may wish to document suspected injury while symptoms are apparent. This includes photographs of affected trees showing extent of injury and also close-up images of injury. Applicators should also maintain up-to-date application records. Since Imprelis is a relatively new product, there are presently no readily available analytical techniques to test soils or foliage, but this could change. Keith Henley, environmental lab manager for A&L Great Lakes Laboratories, suggests that applicators with suspected damage collect soil and foliar samples now and freeze them. As analytical standards and techniques become available, the samples can be thawed and analyzed at a later date.

Related articles:
What to do with Imprelis-affected trees
Imprelis herbicide may injure evergreens

Related resources:
A homeowner’s guide to Imprelis herbicide injury to landscape trees

Michigan Department of Agriculture and Rural Development news release (June 28, 2011):

ISSUE ADVISORY REGARDING THE USE OF DuPont ™ Imprelis ™ Herbicide

The Michigan Department of Agriculture & Rural Development (MDARD) and other state pesticide regulatory agencies are receiving calls regarding suspected adverse effects related to DuPont ™ Imprelis ™ Herbicide.  Commercial pesticide applicators are reporting that the application of DuPont ™ Imprelis ™ Herbicide to turf sites may be causing growth regulator type injury (twisting and curling of new growth) to their evergreens including Norway spruce and white pine.  Some applicators are also reporting damage to other ornamental trees and shrubs like sugar maple and yews. DuPont ™ is aware of the issue. 

DuPont ™ Imprelis ™ Herbicide label use directions include the following restrictions: 

 Any applicator that does not follow the above label use directions is in violation of state and federal law.

 If an applicator suspects adverse effects to ornamental trees or shrubs is related to an application of DuPont ™ Imprelis ™ Herbicide, MDARD recommends they contact DuPont ™ directly so they are made aware of the suspected adverse effect and can respond accordingly. 

 If there is a need to contact MDARD related to DuPont ™ Imprelis ™ Herbicide, please direct your inquiry to Brian Rowe, MDARD’s Pesticide Section Manager, at .(JavaScript must be enabled to view this email address).