Need advice!! My foxtail palm trees have a black type fungus and black spots on the leaves and stems. I asked the nursery where I bought them but they just said it’s pretty normal. Is there a fungicide specific for palm trees or an effective fungicide for outdoor tropical plants that would work on this type of issue? Also what is the best fertiliser for tropical plants in Australia? I looked at Bunnings but I’m not sure of what type/brand to use. Any assistance you could provide would be greatly appreciated :)