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I'm not sure why lichens would indicate anything about the nutrition of 
the tree.  They grow on surfaces that are rough enough to anchor them, 
and that get enough water and light to keep them growing.  If you think 
they are ugly, try rubbing them off.

Lichens seem pretty common on mature oaks.  You don't see them so much 
on young oaks, either because the bark is smoother, or because there 
just hasn't been enough time for them to get established.  They usually 
grow slowly.

Ginda

On Wednesday, April 2, 2003, at 12:29  PM, LONGDISTSHTR wrote:

> I have heard that lichens don't harm trees but may indicate a poor
> nutritional state.  They are getting pretty bad on my walnut and apple
> trees and are unsightly.  Anyone have any thoughts on them?
> Doc Lisenby
> Zone 7/8
>
>
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