What would cause this kind of damage?

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dovey Columbus, OH(Zone 5b) Jul 24, 2006

At first I thought it could be where cutter bees laid their eggs, but now I don't think so.
Could it be damage from a grasshopper or some sort of boring worm/beetle?

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dovey Columbus, OH(Zone 5b) Jul 24, 2006

another photo

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dovey Columbus, OH(Zone 5b) Jul 24, 2006

Last photo - any ideas?

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dovey Columbus, OH(Zone 5b) Jul 24, 2006

No guesses?

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Terry Murfreesboro, TN(Zone 7a) Jul 24, 2006

Dovey, are you sure it isn't just stem canker?

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dovey Columbus, OH(Zone 5b) Jul 25, 2006

Hi Terry,
I suppose, but it was a very healthy new cane and only affected in the one area.
We have quite a few grasshoppers in the rose garden and I thought perhaps that was the cause

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ceejaytown The Woodlands, TX(Zone 9a) Jul 25, 2006

I kinda agree with Terry. Is that discoloration in the pith of the cane? That would indicate a fungus....

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dovey Columbus, OH(Zone 5b) Jul 25, 2006

Ceejay,
I think the discolouration is more like what happens when you slice an apple and it turns brown. I'll do some "stem canker" Googleing and see what I come up with.
Thanks
Dove

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ceejaytown The Woodlands, TX(Zone 9a) Jul 26, 2006

You can take a knife and slice off the outer thin layer of the stem - and the canker would still be running along under that green outer layer... I think that I can see, in the first picture, brown circular streaking, which indicates the fungus is in the xylem, or uptake area of the stem.

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