Plant and Insect Diagnostic Clinic Update – September 15, 2017

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 for updates and more pictures. For more information on a particular disease or insect problem listed, follow the article (hyperlink) cited.

Plant Diseases and Insect Damage

The following highlights represent recent sample submissions from fruit, vegetables, and ornamental plants.  

Tubakia leaf spot
Tubakia leaf spot in red oak. Top: foliar spots. Bottom and middle : signs of the pathogenat different ,agnifications

Broadleaf Trees

Coniferous Trees

Perennials and Annuals

  • Boxwood, Volutella canker, and leaf blight 
  • Serviceberry, lace bugs, rust 
  • Ninebark, spider mite damage



Fruit (small and tree fruit, including hops)

Household and Landscape

Plant ID



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, Yard and Garden, 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 September 15, 2017. The information contained within may not be the most current and accurate depending on when it is accessed.