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