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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Signs on Algae, Fungi, and Plants
Photo#1504351
Exposed Stigmella mine on Oregon Grape
Copyright © 2018 Harsi S. Parker

Exposed Stigmella mine on Oregon Grape
Vashon, King County, Washington, USA
June 8, 2017
Mine on the upperside of a Berberis (Mahonia) nervosa leaf.

I put these two images side-by-side to better illustrate how I often find the miner tucked between two leaves. The image on the left shows the leaf as it appeared when I discovered it, while the image on the right shows the leaf untucked with the mine clearly visible.
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Contributed by Harsi S. Parker on 27 March, 2018 - 10:34pm
Last updated 28 March, 2018 - 7:57am

Moved
Moved from Stigmella undescribed-species-on-mahonia.
… Charley Eiseman, 28 March, 2018 - 7:57am login or register to post comments

Same story as this one:

While there appears to be a linear trail in the photo to the right, I think this is just a "halo" along the margin of the necrotic area... and I'm still not sure what caused that. Were the leaves stuck together at all or just loosely overlapping, without any evidence of silk or frass?
… Charley Eiseman, 28 March, 2018 - 7:55am login or register to post comments

 
Loosely overlapping
To the best of my recollection, all such leaves I have found were not stuck together with any sort of silk, and any accumulated frass either went unnoticed by me or was not present.

The good news is that I have plenty more unusual-looking leaves I can go inspect! I will endeavor to take better images and look much more closely for definitive signs of arthropod activity.
… Harsi S. Parker, 28 March, 2018 - 12:16pm login or register to post comments

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