Here you can request to determine the cause of the damage. You can view the requests of other users and sort them according to the selected criteria. In addition, you can get information about your request, and you can follow the progress of its current state. If your application was not approved, it had probably been because it was impossible to identify the damage based on the sent photos or because the application does not address our topic - determining the pests of trees and shrubs. We will inform you about the status of your application by email.
Visible on multiple tree species, cannot identify for sure but looks like spruce (but also species with flat needles). Observed on both the sunny and shady slopes of the mountain valleys. Old growth trees affected (whole trees observed with needles fallen off).
Answer
Thank you for your request. Unfortunately, determinig the exact cause of this damage is not easy. Your pictures shows a different species, and while each may contribute to the tree defoliation, it´s challenging to pointout the primary reason of this problem. If you are still interested in determining the reason of this problemme, I recommend taking some more pictures of the damaged areas, particulary defoliated branches, larvae or some other more visible symptoms. With best regards Milan Zubrik
Thank you for your inquiry. This is Erysiphe platani, a fungus commonly known as plane tree powdery mildew or sycamore powdery mildew. It is an invasive species in Europe. While it typically does not cause serious problems, severe attacks can lead to tree decline and reduced plant vigor. Common fungicides may help, but repeated applications are often necessary. With best regards, M. Zubrik.
