What causes scale bugs? I seem to have them a lot on my dwarf pittosporum. I have it in a flower bed with an automatic watering system.
Certified GKH Gardening Expert
Scale will attack any plant, but they are more attracted to plants that are weakened. I would check the plant to see if it might be under stress from something (under-watering, lack of nutrients, etc.) and correct this while also treating the scale infestation.