Friday, July 22, 2011


Nick Christians
July 22, 2011

The two most asked questions of the week are 1) how long will Imprelis persist in the soil and 2) will Imprelis damaged trees recover.

The answers are:

1. Imprelis is known to be quite persistent in soil, but how long it will last depends on a variety of factors. These include rainfall, soil type, organic matter content of the soil, temperature conditions through fall and spring and other variables that will be different from region to region. As a result, there is no clear answer to that question. I would expect that most of the material applied this spring at label rate will be gone by next season, but again, it will vary by location and conditions on the site.

2. The answer to question 2 is also going to vary. At this point, no one knows for sure what is going to happen next year.

There are already companies coming up with questionable solutions. See
My recommendation is to water the damaged trees, but don't water to excess. Otherwise, leave them alone and see what happens next spring. Stay away from the home remedies and concoctions that are being recommended. If you kill the tree by something that you did, you will likely not get a settlement on it.

Here is my best guess on what is going to happen. It will depend of the extent of the damage.

The tree below has damage limited to 2011 new growth. I'm betting that it will recover next year, but of course I will not know for sure until next spring or summer.

The tree in the next picture is border line. If it recovers, I will be surprised.

This one, which is located on the same course in Chicago as the other two, is likely dead and will show no recovery next year.

The only thing you can do at this time is get good photographic record of the damage and wait until next year to see what recovers.


Mark Storby said...

Nick, my county extension agent sent me an email today saying MSU is offering to test samples of expected trees to determine if there is Imprelis present in the tissue. Do you think this is a good idea for my records and if you do, would it be better to test a totally dead tree or one with minor damage?

Nick Christians said...

Mark: Call me on Monday at 515-294-0036. I have a couple of questions before I can answer.

Mark Storby said...

Nick, I will have to call you a week from Monday, I am on vacation and won't be back till the 1st. Thanks for the reply...