I would take the pictures (take a few that are even more close; a few above the area where the substance occurs) and samples to a local agriculture extension service or a local plant nursery to get a diagnosis. The pictures remind me of bacterial canker (also called “gummosis”, “blossom blast”, “dieback”, “spur blight” or “twig blight”) but it is best diagnosed in person.
Answered on July 18, 2021
Was this answer useful?00
Looking for more?
here are more questions about...Cherry Laurel