Plant and Insect Diagnostic Clinic Update - December 9, 2009

The following are highlights and updates about samples and questions recently received in the Clinic:


Thousand cankers disease of black walnut is a mouthfull to say, but it is a new and potentially devastating disease of the black walnut tree, Juglans nigra.  Thousand canker disease is a newly recognized disease that has devastated black walnut trees in many towns in the western United States, from New Mexico to Idaho. For more information see the ISU Yard and Garden Column and the fact sheet from Colorado State University.

What to plant as replacements for ash trees is an important topic to consider as we anticipate the arrival of emerald ash borer into the state of Iowa.  See information from Jeff Iles in the ISU Yard and Garden Column.


Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on December 9, 2009. The information contained within may not be the most current and accurate depending on when it is accessed.