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English Walnut Tree

Walnut    None Given

I have an old English Walnut tree that has an orange yellow looking fungus. What is it and how do we treat it? Please see pictures.


Posted by: Jack anderson (2 points) Jack anderson
Posted: May 21, 2016




Answers
2
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Photo not very clear but at first glance it appears to be lichen growing on the bark. Lichen is a symbiotic relationship between a fungus and an algae. If the branch/tree is healthy and there is no branch die-back associated with the phenomenon then it probably is lichen.


Posted by: Wijnand Swart (5 points) Wijnand Swart
Posted: May 23, 2016




1
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Agree with the lichen diagnosis. Lichens are not parasitic on the tree, just using branches as growth surface - epiphytes. Lichen growth has been linked with air quality as they are sensitive to air pollution.


Posted by: Charlie B. (5 points) Charlie B.
Posted: May 24, 2016




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I also think this is lichen. It should be possible to take a closer up picture with the macro setting on a regular camera. Lichen has characteristic shapes. Also touch it with your finger and see if it is hard to the touch.


Posted by: David Hughes (67 points) David Hughes
Posted: May 25, 2016




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