6/17/2011 - By Harrell's

DuPont Professional Products4417 Lancaster PikeChestnut Run Plaza 705Wilmington, DE 19880-0705

Dear Turf Management Professional,

We are aware that some of your customers are observing various unfavorable symptoms on certain species of trees.

Our turf development team has been investigating these reports and we are trying to better understand the circumstances and whether the various symptoms are related to applications of DuPont™ Imprelis™ herbicide. Our investigation is not complete and we will need your help in gathering necessary information and in determining what variables may have contributed to the symptoms being observed.

While this work continues we want to make you aware of the information we have received to date:

• A majority of the reports involve Norway Spruce or White Pine.
• In most cases, Imprelis™ was not applied alone, but in a mixture with other herbicides, either pre-emergent, post-emergent and/or with a liquid fertilizer.
• Some reports indicate there may have been errors in use rates, mixing practices and/or applications to exposed roots, or the tree.
• Most lawn care professionals and golf course superintendents have used Imprelis™ to successfully control weeds and have not reported unfavorable tree symptoms.

Additionally, when applying Imprelis™, be careful that no spray treatment, drift or runoff occurs that could make contact with trees, shrubs and other desirable plants, and stay well away from exposed roots and the root zone of trees and shrubs. Consult a certified arborist if you are uncertain about the root zone of specific tree species.

In many geographies, environmental conditions over the past few years have stressed trees, particularly spruces. We have observed unfavorable symptoms in trees on properties that have not been treated with a herbicide. Good growing conditions and appropriate care to minimize stress will enable many trees experiencing signs of stress to recover and return to good health.

A DuPont representative will be contacting you within the next 7-10 business days to schedule an appointment to review your observations and gather detailed information relative to this situation. Please help us to make our meeting productive by having application information and other pertinent details ready to discuss.

We appreciate your patience and cooperation as we continue our work.

Sincerely,Michael McDermottGlobal Business LeaderDuPont Professional Products