Plant and Insect Diagnostic Clinic Update - May 18, 2011

The following are highlights and updates about samples and questions recently received in the Plant & Insect Diagnostic Clinic:
 
Insects

 

Several questions and rumors have been received lately concerning the presence of emerald ash borer (EAB) within the state of Iowa.  The situation remains unchanged from our report in the Horticulture & Home pest News on January 12, 2011.  The only site is Iowa where EAB has been found is on Henderson Island, in the Mississippi River, in Allamakee County, 2 miles south of the Minnesota border.  There are still no other sites in Iowa were EAB has been found.

 

Diseases

 

Spring is the time for fungal leaf diseases.  This year we have received several samples of peach leaf curl.  This fungal disease makes the leaves of peaches appear all curly and strange.  It is too late to treat once symptoms appear.  It is generally no terribly harmful to the tree but if defoliation occurs be sure to reduce fruit set.  A heavy fruit set after a spring defoliation can stress the tree.  Please see this article for more information and a picture of peach leaf curl. 

 

 

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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 May 18, 2011. The information contained within may not be the most current and accurate depending on when it is accessed.