Q: What are these yellow spots on my shrubs and what can I do to get rid of it?
A: Thanks for bringing me a sample of the problem. Managing the disease can be done but it will take some effort. Your shrub is called Pittosporum and there are several varieties of the plant from medium sized trees to small dwarf plants. Some of the plants are solid green while others some in a white and green variegation. Once established, these plants are extremely drought tolerant and really do not require irrigation unless we go through a drought period, which is true of most woody tree and shrubs. The golden, orange spots on the leaves are caused by a fungus. It is important for the leaves of the shrub to remain dry – so be sure to keep irrigation sprays away from these plants. Good air circulation is also important, so light, selective pruning can be done to allow for good air flow. The disease is called angular leaf spot and it is a common problem on Pittosporum plants. Consider using a fungicide containing the active ingredients of myclobutanil or azoxystrobin on the new growth. Please follow the directions on the pesticide label – the label is the law. Do not use a fungicide containing the active ingredient chlorothalonil (Daconil) as it has been known to damage Pittosporum.