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Photo#862348
Insect boring - Oecanthus

Insect boring - Oecanthus
Pine Barrens County, New Jersey, USA
October 30, 2009
Holes drilled into little bluestem in the NJ Pine Barrens. About the size of a fine pencil point.

These appear to be tree cricket eggs ...
I agree.

 
I've only photographed one ovipositing cicada...
...but as Charley indicates, the markings did appear to look more like longer slits.


Moved
Moved from ID Request.

Oviposition holes
I think Yurika is on the right track, but I suspect these were made by a tree cricket because they are points/punctures rather than slits. I don't think any bird would produce such precise little holes when going after insects inside a stem.

And more possibility...?
Egg-laying scars by treehopper/leafhopper?
Here is somewhat similar thing image.


And I found scars just like yours on bluestem in my yard last month or so too! (I took picture, but I didn't up here...)

Bird damage?
This might not be insect damage, but a consequence of birds trying to get at insects inside. I don't know if the holes would have fibers sticking out after being excavated from the outside.

There are several grass feeding flies. Some of them are opportunistic on damaged plants.

 
Perhaps is appears to be an e
Perhaps is appears to be an exit hole.

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