File:Douglas Fir needle with galls (31225230214).jpg
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Size of this preview: 800 × 533 pixels. Other resolutions: 320 × 213 pixels | 640 × 427 pixels | 1,024 × 683 pixels | 1,280 × 853 pixels | 2,560 × 1,707 pixels | 5,356 × 3,571 pixels.
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| Description | Douglas Fir (Pseudotsuga menziesii) needles attacked by two bioagressors : 1) the somewhat inflated bases of the needles colored with violet are galls caused by the Douglas fir needles gall midge (Contarinia pseudotsugae s.l.) 2) the brownish/reddish, dessicated needle tips are probably caused by a fungal pathogen (maybe the Swiss Needle Cast, Phaeocryptopus gaeumannii). These last symptoms could also be caused by physiological problems or by the destruction of the needle conductory tissues by the Contarinia larvae. |
| Date | |
| Source | Douglas Fir needle with galls |
| Author | Gilles San Martin from Namur, Belgium |
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
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This image was originally posted to Flickr by Gilles San Martin at https://flickr.com/photos/9082612@N05/31225230214 (archive). It was reviewed on 23 November 2017 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:58, 23 November 2017 | | 5,356 × 3,571 (5.58 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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