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Requests to determine the cause of damage

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.

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Spruce sawfly
Piliarka horskáPiliarka horskáPiliarka horská
Spruce sawfly
Number: 6548
Received 20.7.2025
In progress: 1 days
Date of occurrence: 30.6.2024
Significance: Harmful
Discussion
From: Aasegro
Assigned: M. Zúbrik
Country: Switzerland

Question

Started noticing damage summer 2022 - gradually getting worse. This year quite extensive damage. Have included photoes from 2024 and 2025, all of same tree. I am interested in identifying the pest and any suggestions on limiting the problem.

Answer

Dear Aasegro, Thank you for your question and the photos you included. Based on the symptoms and the location, it is likely one of the sawfly species — either Pristiphora abietina or Pachynematus montanus. Considering the locality, I would lean toward Pachynematus montanus, but it is difficult to confirm the exact species just from larvae and symptoms alone. As for control measures, the application of a suitable insecticide may help. I recommend consulting your local garden center or agricultural supplier — they can advise you on appropriate products for your area. If you need further assistance, feel free to ask. Best regards, Milan Zubrik
Number of votes for this answer: 0

Pest

Spruce sawfly

Pachynematus montanus

Spruce sawfly

Pachynematus montanus

hmyz

Received: 20.7.2025
Wood: Spruce
Number: 6548
Date of occurrence: 30.6.2024
Discussion

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