The Value of Christmas Trees

"...there is no reason why the joy associated with the Christmas evergreen may not be a means of arousing in the minds of children an appreciation of the beauty and usefulness of trees; and keen appreciation of the beauty and usefulness of trees is a long stop toward the will to plant and care for them (Arthur Sowder, US Forest Service, 1949)."

Wednesday, April 11, 2012

Safari Control of HWA

In February 2011 when this photo was taken, these trees had no HWA.
In June of 2010, I made a post on some hemlocks at my office that I had treated for HWA. (See post: HWA Control).

I looked at those trees today and they are covered with HWA and with EHS. The controls worked for 3 years, which wasn't bad.

It seems to me like there is a lot of HWA this spring -- not just on these trees but everywhere. It might be because of the warm winter.

Has anyone else observed how long Safari has controlled HWA? If so, make a comment about your situation.


  1. I'm seeing very mixed reviews for Safari on HWA - some say its amazing, others seem to have been very disappointed, as on your site. Do you think it's better or worse than imidacloprid, and do you think results are different with soil drench vs trunk spray? Thanks so much for sharing this work!

  2. Sorry it's taken me so long to reply. I haven't been watching!
    I think Safari works a lot faster than imidacloprid, and almost always works well. Of course, sometimes imidacloprid fails to control as well. As to which gives better results -- soil drench or trunk spray -- I don't know. I haven't ever compared them side by side. Does anyone else have any observations?

  3. Thanks Jill. Is it true that trunk spray (carefully applied of course) is recommended for trees close to water?