Answer: Rather than a fungal disease, I think your trumpet tree has a population of mealybugs or cottony scale. Scale insects look like bumps but you can peel them off with your fingernail or you can squish them and they will have a fluid inside. If this is what you can do, the bumps are scale insects. The powdery mounds can be either mealy bugs or cottony scale insects. Both can be scraped off or you can suffocate them with an application of summer weight horticultural oil. There are other insecticides on the market that you can use. Just look for control products that list scale insects and mealy bugs and apply it according to label directions. Best wishes with your trumpet tree.
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