What is a typical sign of powdery mildew on ornamental plants?

Powdery mildew is a fungal disease that is commonly found on a variety of ornamental plants. A typical sign of this condition is the presence of white powdery spots on the foliage. These spots are actually the spores of the fungus, which thrive in warm, dry conditions and can spread rapidly to other parts of the plant and neighboring plants if not managed properly. The appearance of powdery mildew usually starts on the upper surfaces of leaves, but can also affect flowers, stems, and buds.

Recognizing these white powdery spots is crucial for prompt action to control the spread of the fungus, which can lead to more serious damage if left unchecked. This is why identifying the correct sign, as in this case, is important for effective disease management in ornamental horticulture.