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.
We continue to observe fungal leaf spots on several tree species. The most common in being Pseudocercopora leaf spot in lilac, Poplar leaf spot, and Tubakia leaf spot.
Bur oak blight is also one of our more frequent samples in the last month. See the Clinic website for more information.
Fruit (small and tree fruit)
Bitter rot has become a problem in grapes clusters. This disease is managed by a combination of sanitation practices and fungicide sprays. For a fungicide, spray program for commercial production of grape visit the Midwest Fruit Pest Management Guide 2016.
Apple scab, sooty mold and flyspeck continue to be seen in apple fruit at the time of harvest.
We are happy to assist in identification of fungi. see Mushroom Identification page.
We often receive digital images where we cannot see key characteristics, making it impossible to identify a mushroom with certainty. In fact, to identify mushrooms, we need a physical sample accompanied by digital pictures. Please see our video on how to collect and submit a mushroom sample for identification at https://youtu.be/C2uEawdisP8 and our article on the steps to collect mushroom for identification.
Remember the ISU Plant and Insect Diagnostic Clinic Identifies Mushrooms, Not Edibility. We do not make recommendations about whether you should eat them.
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 October 3, 2016. The information contained within may not be the most current and accurate depending on when it is accessed.