Holy plum tree! What is wrong?

A:

The insects are not related to the holes in the leaves. The insects are aphids, which are piercing/sucking feeders that extract plant juices. It appears you have a the exuvia (skin or exoskeleton) of a ladybird beetle larva that molted and is probably eating the aphids. That's good!

The holes are probably caused by a disease called shot hole. This is caused by a fungus.

Check UC IPM's Shot Hole information for more information.

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