The following are highlights and updates about sample submissions for our different services (identification or Plant problem diagnosis from fruit, vegetables, and ornamentals), 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 cited.
Plant Problem diagnosis (with links to articles)
| Host Category | Plant | Identification or Diagnosis |
|---|---|---|
| Broadleaf trees | Red Maple | Suspected transplant stress, trunk cracks |
| Broadleaf trees | Poplar (Hybrids) |
|
| Broadleaf trees |
Star Magnolia |
|
| Broadleaf trees | Serviceberry | Sawfly damage Pear Sawfly or Pearslug |
| Broadleaf trees | London Planetree | Click beetles |
| Broadleaf trees | Silver Maple |
Maple Tar Spot, Negative for Verticillium wilt |
| Broadleaf trees | Pear (Ornamental) | |
| Broadleaf trees | Dogwood | Cercospora (Fungal) leaf spot |
| Broadleaf trees | Red Oaks | Oak anthracnose Anthracnose on shade trees |
| Broadleaf trees |
White Oak |
Suspected Two line chestnut borer, Tree decline |
| Broadleaf trees | Ohio Buckeye | Fungal leaf spot (anthracnose), Physiological leaf scorch |
| Coniferous trees | Arborvitae | Phyllosticta needle blight *** NEW ENCYCLOPEDIA ARTICLE*** |
| Coniferous trees | Spruce | Abiotic disorder-Suspected environmental injury |
| Fruit | Cherry | Cherry fruit fly Fruit, Vinegar, and Pomace Flies |
| Fruit | Raspberry | Decline, virus |
| Fruit | Japanese Pear | Fire Blight |
| Fruit | Common Apple | Apple scab |
| Fruit | Common Apple | Suspected injury Preventing Herbicide Injury in the Landscape |
| Fruit | Hops | Hops downy mildew  |
| Perennials and Annuals | Burning Bush | Potential injury Preventing Herbicide Injury in the Landscape |
| Perennials and Annuals | Forsythia | Suspected crown and root rot |
| Perennials and Annuals | Pinnate Prairie Coneflower | Septoria leaf spot |
| Perennials and Annuals | Buttonbush | Eriophyid mite galls Insect Galls on Trees and Shrubs |
| Perennials and Annuals | Goldenrod | Gall midge, fungal leaf spot |
| Turf | Kentucky Bluegrass | Red threat, Ascochyta leaf blight, Summer patch, brown patch |
| Vegetables | Tomato | Tomato Spotted Wilt Virus TSWV, White mold (Sclerotinia), Alternaria blight and canker see Tomato Diseases and Disorders |
| Pathogens | Cabbage | Alternaria leaf spot |
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 July 16, 2019. The information contained within may not be the most current and accurate depending on when it is accessed.