High Risk for Oak Wilt

High risk for oak wilt


On March 18, 2012 Minnesota changed the oak wilt risk status from safe to high. Normally, the risk period for oak wilt would begin in April and continue through July.


Above average temperatures during the past weeks have been ideal for the emergence of Colopterus truncates, a nitidulid beetle responsible for transmitting the oak wilt fungus from diseased to healthy trees. High temperatures and rainy days also cause the oak wilt fungus to form spore mats underneath the bark of dead or dying trees (see picture below). These spore mats have a sweet odor that attract nitidulid beetles and once the beetles come in contact with spores mats they can move fungus to recently wounded oak trees. So for now until the end of July avoid any wounding on your trees and put those pruners away!  For more information about oak wilt, please view this article and bulletin.


Stay tuned for more updates!


Category: 
Authors: 

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 March 21, 2012. The information contained within may not be the most current and accurate depending on when it is accessed.