What disease causes Evergreen shrubs to turn rust color?

Evergreen shrubs can turn rust color due to a fungal disease known as "rust." This disease is caused by various rust fungi that infect the leaves and stems, leading to the formation of orange or rust-colored spores. Environmental factors such as high humidity and poor air circulation can exacerbate the problem, making it more prevalent in certain conditions. Prompt identification and treatment are essential to prevent further damage.