wierd yellow stuff

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watersedge Northeast Harbor, ME Feb 22, 2007

I have this unusual yellow growth on my hawthorne and maple. Does anyone know what this is?

Thanks.

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Resin Northumberland, United Kingdom(Zone 9a) Feb 22, 2007

Lichen. Completely harmless, it is only using the branches as a parking space, it doesn't take anything from the tree.

Resin

PS spellcheck: hawthorn (no -e :-)

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peony01 Prattville, AL(Zone 8a) Feb 22, 2007

No expert here, but I've been told by my county agent that lichen on a tree indicates that the tree is under stress, not from the lichen but from other issues. Don't mean to complicate the discussion.:))

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Resin Northumberland, United Kingdom(Zone 9a) Feb 22, 2007

Quoting:
No expert here, but I've been told by my county agent that lichen on a tree indicates that the tree is under stress, not from the lichen but from other issues

Very dense lichen growth can indicate this, but does not always. The reason is that if the tree has a very thin, unhealthy crown, there is more light available for lichens to grow in. A dense, healthy crown can create such dense shade that lichens won't grow well. However, many trees naturally have a fairly open crown even when healthy, that allows through enough light for lichens. So the trees here may be OK.

Resin

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malusman Peoria, IL Feb 23, 2007

Watersedge,

Strange looking stuff! I'd be tempted to cut into the big branch with a chainsaw right after it takes that sharp left-hand turn. Not that it would solve anything but it'd be interesting to see what's inside. Looks like the branch had been pruned once, a possible entry wound for wood-rotting fungi. Don't leave you car parked under it if there's an ice storm predicted.

Regards,
Ernie

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