I agree, and I assure you it's not panic I intend to spread, but the recent issues were suggested by a couple other posts buried in another thread. This is going to deserve attention. That being said, there is no question imprelis is a great product when used properly.
When is the last time you spoke to your Dupont rep? Touch base with him/her tomorrow and ask about any recent issues with trees, and if there are any specific trees that may be more succesptible than others. There is apparently a good reason why the label recommends avoiding the drip line. Who know, maybe it will all blow over and turn out to be nothing.
I do apologize, but I can't mention the specifics of the app.