November 11, 2009

Christmas Tree Selection and Care


Plant and Insect Diagnostic Clinic Update - November 11, 2009

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


New Threat to Iowa Trees - Thousand Cankers Disease of Black Walnut

Thousand cankers of walnut is an insect vectored disease that kills black walnut trees. So far the disease has been reported in western states and not in Iowa or other parts of the native range of black walnut. However, like other tree disease and insect pests this one is easily spread by human transport of wood materials. Pass the word along about this emerging disease problem and keep an eye on your walnut trees.

For more information please see the ISU Yard & Garden Column.

Apple Bitter Rot

Bitter rot was found on river apples from Winneshiek County, Iowa last September. Infection was caused by the conidial type of the fungus Colletotrichum gleosporioides.

Another Accidental Invader: The Pine Seed Bug

The pine seed bug is a common household accidental invader found inside Iowa homes during the fall, winter and spring.