Which of the following is a common disease that affects landscape plants?

Powdery mildew is a common disease affecting a wide range of landscape plants. It is characterized by a white, powdery fungal growth on leaves, stems, and buds, often thriving in conditions of high humidity and low air circulation. This disease can lead to reduced vigor in plants, stunted growth, and lower overall aesthetic quality.

The prevalence of powdery mildew in various climates and its ability to spread rapidly makes it a significant concern for landscape horticulturists. Managing this disease often involves improving air circulation around plants, ensuring adequate spacing, and applying fungicides if necessary.

While leaf curl can affect certain plants, particularly fruit trees, it is not as widespread as powdery mildew in landscape settings. Root sprouting is a growth response and not a disease, while flower blight, although affecting flowering plants, does not occur as commonly as powdery mildew. Therefore, powdery mildew stands out as a notably common disease in landscape horticulture.