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Orange Spots on Rose Leaves

Updated March 23, 2017

Rose plants are apt to fall victim to a variety of diseases. Symptoms that include orange spots are indicative of a fungus. Diseases are largely controlled through cultural measures.

Cause

Orange spots on rose leaves are typically the result of rose rust. The disease is the result of a fungus, Phragimidium mucronatum, which often targets older leaves first and then spreads to younger leaves.

Effects

Rose rust causes orange, brown, purple, black or yellow spot-like spores on the underside of leaves. Raised orange postulates will also infect the branches of the plant. The disease causes leaves to dry, twist and eventually fall off the plant.

Control

Planting rust resistant varieties is the best way to control the disease. Good air circulation around plants will also thwart its growth and prevent leaves from staying wet for long periods of time. Swiftly remove all infected leaves from the plant to prevent its spread. Fungicides are a last resort.

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About the Author

Lara Webster has been writing professionally since 2009. Her work has been featured on Relationships in the Raw, The Nursery Book, Spark Trust and several travel-related websites. Webster holds a Bachelor of Arts in English and a Master of Arts in mass communication and media studies, both from San Diego State University.