To keep your Plumeria healthy, it’s important to watch out for signs of powdery mildew. This fungal disease can be identified by the appearance of white, powdery spots on the plant’s leaves and stems. If you notice powdery mildew, remove any infected parts and dispose of them properly. To control the spread of the disease, use a fungicide specifically labeled for powdery mildew on your Plumeria. Additionally, make sure the plant has good air circulation and avoid overhead watering to reduce humidity. Regularly inspect your Plumeria and take prompt action to manage powdery mildew and protect your plant.