Plant and Insect Diagnostic Clinic Update - December 11, 2015

The following are highlights and updates about samples and questions recently received in the Plant and Insect Diagnostic Clinic. Visit the PIDC's Facebook page to ask questions and for updates and more pictures.



During the past month, the influx of samples has decreased due to the seasonal temperatures. We are receiving mainly conifer (spruce, pine, etc.) samples.


Rhizosphaera needle cast is the most common disease observed these days in the clinic. It has been diagnosed on several types of spruce including Norway spruce. For more information, and pictures of symptoms, visit the Clinic website.



Earlier in December we also diagnosed a white pine suffering from Lophodermium needle cast, a disease secondary to transplant shock. To learn more about how to avoid transplant shock read the ISUEO publication "Community Tree Planting and Care Guide" available at the ISU Extension Store.  


Last week the clinic received a mushroom specimen for identification, it turned out to be a beautiful (to the eyes of the mycologist) Earthstar Fungus.  For more information read the article in this issue: "What's With These Things Growing in My House Plant Soil?"


Lina Rodriguez Salamanca Extension Plant Pathologist and Diagnostician

Dr. Lina Rodriguez-Salamanca is a diagnostician and extension plant pathologist with the Iowa State University Plant and Insect Diagnostic Clinic  (, a member of the National Plant Diagnostic Network (NPDN, ...

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