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What causes this?


timbernut
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Variegation can be caused by a few things inc. virus, cell mutation etc.

 

Because yours show the same symptoms on two different spp then I would think it is not variegation.

 

It is more likely to be mineral deficiency that's caused by: a) lack of that nutrient in the soil or b) nutrients being locked in the soil and unavailable for uptake.

 

Road salt in small amounts can lock nutrients and this may be the case here.

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Thanks for your replies. Graham, I just got a blank page when I opened your link.

Stubby I don't think it's potassium deficiency as the hornbeam in particular has lots of brethren in close proximity and I'd expect to see the same thing on at least some of them. Incidentally the entire hornbeam is leaved like this (I clambered up it this morning)

 

 

 

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