Advice on locust tree orange growth in Grand Junction

Asked March 31, 2020, 1:55 PM EDT

Hi,
We have 4 mature locust trees on our property and several of them have a yellow/orange growth on them that I don't remember being there last year. I've attached photos. Please let me know if this is serious or if there is a solution we can implement.
Thank you,
Alex Moore

Mesa County Colorado

1 Response

This is some kind of moss or lichen. Will not hurt the tree. Can represent a tree that is growing slow or under stress thou. I noticed these old trees are growing near a driveway. This may sound crazy, but in times of drought, water the gravel area so the roots underneath get moisture. Once a month should be enough. https://cmg.extension.colostate.edu/Gardennotes/657.pdf