"Opening the Door to Industry Education"Lawn & Landscape AssociationIndiana Professional


26 Jun 2011 9:36 PM | IPLLA Admin (Administrator)




Office of the Indiana State Chemist

Purdue Plant & Pest Diagnostic Laboratory

For additional information on herbicide injury to plants see Diagnosing Herbicide Injury on Garden and Landscape Plants, ID-184-W.

Purdue Agronomy Turf Tips:


IPLLA News Online



To:  All IPLLA Members

From:  Bob Andrews

Subject: Update on Imprelis

As you know, recent reports have indicated a possible link between the application of the herbicide Imprelis, which is manufactured by DuPont, to apparent root uptake damage on Norway Spruce and White Pine Trees.  As this story unfolds, there are now seem to be more questions than answers.  As Executive Director, I get a good deal of input on such issues from all sides. Sifting facts from rumors is often difficult, but here is what we have learned so far:

The Office of the Indiana State Chemist (OISC) is actively investigating reports of possible herbicide damage to such trees and has a number of properties undefined which they will visit, take samples, and then conduct their own lab tests for the presence of the chemical.

The damage appears to be isolated and very spotty with one or two trees showing possible damage, while others immediately next to them do not.

Some of the samples submitted by IPLLA members also show the presence of the disease Needlecast and/or mite damage.

At present, there does not seem to be a recommended course of action coming from DuPont as how to treat the affected trees to aid their recovery.

As of this writing, the OISC has not issued a Stop Sale Order banning the use of Imprelis and will not consider doing so until their field investigations are complete.

IPLLA Members should not send samples of potentially damaged trees to the OISC as they will not be accepted.  The OISC must take the samples themselves as they are working hard to be sure this investigation is uniform in every respect.

DuPont has provided your supplier with a reporting form which you should now have if you purchased Imprelis this past spring.  If you suspect damage, then this form should be completed and returned as directed.

Finally, I would urge all members to keep very thorough records of any suspected damage.  Talk with the customer, take photos, and send samples to the Purdue University Plant, Pest, and Diagnostic Lab (PPDL) to determine if the plant also is suffering from disease or insect damage.

IPLLA will continue to monitor this situation and keep you up-to-date.

Send To Phone

Copyright 2020 Indiana Professional Lawn & Landscape Association and Indiana Irrigation Contractors Council

Powered by Wild Apricot Membership Software