We will identify your pest
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.
Code
Date
Assigned
Status
Days from submission
7458
21.2.2026
michal.lalik@nlcsk.org
Completed
3
7456
20.2.2026
A. Kunca
Completed
4
7409
27.1.2026
R. Leontovyč
Completed
7
7407
27.1.2026
A. Kunca
Completed
7
7349
16.1.2026
R. Leontovyč
Completed
1
7341
14.1.2026
R. Leontovyč
Completed
1
7340
14.1.2026
A. Kunca
Completed
2
7325
9.1.2026
R. Leontovyč
Completed
4
7323
8.1.2026
A. Gubka
Completed
1
7315
7.1.2026
R. Leontovyč
Completed
1
Rejected requests are not displayed. You have been notified by email that your application has been denied.
Number: 6633
Received 3.8.2025
In progress: 1 days
Date of occurrence: 3.8.2025
Significance: Very harmful
Discussion
False Turkey tail
Stereum hirsutum
Received: 3.8.2025
Wood: Buk
Number: 6633
Date of occurrence: 3.8.2025
Discussion
Add comment: False Turkey tail
Number: 6631
Received 3.8.2025
In progress: 1 days
Date of occurrence: 3.8.2025
Significance: Very harmful
Discussion
Common pine shoot beetle
Tomicus piniperda
Received: 3.8.2025
Wood: Borovica
Number: 6631
Date of occurrence: 3.8.2025
Discussion
Add comment: Common pine shoot beetle
Number: 6630
Received 3.8.2025
In progress: 1 days
Date of occurrence: 3.8.2025
Significance: Harmful
Discussion
Catalpa powdery mildew
Erysiphe elevata
Received: 3.8.2025
Wood: Katalpa
Number: 6630
Date of occurrence: 3.8.2025
Discussion
Add comment: Catalpa powdery mildew
Number: 6625
Received 2.8.2025
In progress: 2 days
Date of occurrence: 2.8.2025
Significance: Harmful
Discussion
Horse-chestnut leaf miner
Cameraria ohridella
Received: 2.8.2025
Wood: Pagaštan
Number: 6625
Date of occurrence: 2.8.2025
Discussion
Add comment: Horse-chestnut leaf miner
Number: 6624
Received 2.8.2025
In progress: 2 days
Date of occurrence: 2.8.2025
Significance: Less harmful
Discussion
Mulberry leaf spot
Cercospora moricola
Received: 2.8.2025
Wood: Moruša
Number: 6624
Date of occurrence: 2.8.2025
Discussion
Add comment: Mulberry leaf spot
Number: 6623
Received 2.8.2025
In progress: 0 days
Date of occurrence: 2.8.2025
Significance: Less harmful
Discussion
Gall mite Eriophyes tiliae
Eriophyes tiliae
Received: 2.8.2025
Wood: Lipa
Number: 6623
Date of occurrence: 2.8.2025
Discussion
Add comment: Gall mite Eriophyes tiliae
Number: 6622
Received 1.8.2025
In progress: 0 days
Date of occurrence: 1.8.2025
Significance: Less harmful
Discussion
Assigned: M. Zúbrik
Country: Slovenia
Question
Answer
Hi Tina, than you for your requestt. This is caused by Andricus quercuscalicis, a small wasp species. It's called a Knopper gall. The female wasp lays her eggs on the acorn cup in May and injects a special fluid into it. In response, the oak tree forms a strange growth – a green, irregular lump about 2 cm long, known as a gall. Inside this gall, the wasp larva develops. With best regards Milan Zubrik
Number of votes for this answer: 0
Pest
Knopper gall
Andricus quercuscalicis
Knopper gall
Andricus quercuscalicis
Received: 1.8.2025
Wood: Oak
Number: 6622
Date of occurrence: 1.8.2025
Discussion
Add comment: Knopper gall
Number: 6606
Received 30.7.2025
In progress: 1 days
Date of occurrence: 30.7.2025
Significance: Less harmful
Discussion
Cynipid gall wasp Cynips quercusfolii
Cynips quercusfolii
Received: 30.7.2025
Wood: Oak
Number: 6606
Date of occurrence: 30.7.2025
Discussion
Add comment: Cynipid gall wasp Cynips quercusfolii
Number: 6604
Received 30.7.2025
In progress: 0 days
Date of occurrence: 30.7.2025
Significance: Less harmful
Discussion
Knopper gall
Andricus quercuscalicis
Received: 30.7.2025
Wood: Oak
Number: 6604
Date of occurrence: 30.7.2025
Discussion
Add comment: Knopper gall
Number: 6603
Received 30.7.2025
In progress: 1 days
Date of occurrence: 30.7.2025
Significance: Harmful
Discussion
Web-spinning pine-sawfly
Acantholyda hieroglyphica
Received: 30.7.2025
Wood: Pine
Number: 6603
Date of occurrence: 30.7.2025
Discussion
Add comment: Web-spinning pine-sawfly
Number: 6600
Received 30.7.2025
In progress: 0 days
Date of occurrence: 30.7.2025
Significance: Harmful
Discussion
Oak powdery mildew
Microsphaera alphitoides
Received: 30.7.2025
Wood: Oak
Number: 6600
Date of occurrence: 30.7.2025
Discussion
Add comment: Oak powdery mildew
Number: 6598
Received 30.7.2025
In progress: 0 days
Date of occurrence: 30.7.2025
Significance: Less harmful
Discussion
Buff-tip moth
Phalera bucephala
Received: 30.7.2025
Wood: Oak
Number: 6598
Date of occurrence: 30.7.2025
Discussion
Add comment: Buff-tip moth