Why Is Part Of My Pittosporum Tenuifolium Tree Dying. Some Branches Are Healthy, While Others Are Dying

Question

Overall the tree appears healthy, gets full sun and good drainage. Located in northern California, just south of San Francisco. Trunk looks ok. Branches seemed to develop cracks and dye over a long period about 6 months. Thanks for the help. These are great trees.

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Answer 1

This appears to be what is known as Southern Blight. This article will help:

https://www.gardeningknowhow.com/plant-problems/disease/controlling-southern-blight.htm