Locust Trees
Q.

locust tree

Zone SW New Mexico, high desert grows w lilacs , apricot trees, Bradford Pear trees and cacti | Anonymous added on December 2, 2018 | Answered

In SW New Mexico. Our small locust tree if eight years has a trunk that has gradually grown black!

A.
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drtreelove
Certified GKH Gardening Expert
Answered on December 3, 2018

No photos came through so can only provide best guess. It could be natural color of black locust, or it could be sooty mold growing on honeydew secretions from an aphid infestation. The mold is not harmful, but the aphids are sucking insects that can weaken the tree.

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