Cedar Hawthorn Rust Disease: The Threat to Your Landscape

The Cedar Hawthorn Rust Disease is a major plant disease that affects cedar and hawthorn trees. This disease can cause serious damage to your landscape, reducing the beauty and value of your property. In this article, we will explore the causes, symptoms, and treatment of Cedar Hawthorn Rust Disease.

What Causes Cedar Hawthorn Rust Disease?

Cedar Hawthorn Rust Disease is caused by a fungus called Gymnosporangium globosum. This fungus has a complex life cycle that involves two hosts: cedar trees (or other juniper species) and hawthorn trees. The fungus starts its life cycle on cedar trees, where it produces small, orange balls called telia in the spring. These telia release spores that are carried by wind to hawthorn trees, where they infect the leaves, stems, and fruit of the tree.

The fungus then produces another type of spore called basidiospores, which are released into the air and carried back to cedar trees, where they start the process all over again. This cycle continues throughout the growing season, with both cedar and hawthorn trees suffering from the infection.

Symptoms of Cedar Hawthorn Rust Disease

The symptoms of Cedar Hawthorn Rust Disease can vary depending on the host tree. On cedar trees, you may see small, orange balls (telia) on the branches or trunk in the spring. These balls can turn black as they age, and may be accompanied by yellow spots on the leaves. On hawthorn trees, the symptoms can include yellow spots on the leaves, stem cankers, and deformed fruit.

If left untreated, the disease can spread quickly and cause significant damage to your landscape. Infected leaves may fall prematurely, weakening the tree and making it more susceptible to other diseases and pests. Infected fruit may become deformed and unmarketable, reducing the value of your harvest.

Treatment of Cedar Hawthorn Rust Disease

There are several ways to treat Cedar Hawthorn Rust Disease, but prevention is always the best option. If you have both cedar and hawthorn trees on your property, try to keep them as far apart as possible to reduce the risk of infection. You can also choose rust-resistant varieties of hawthorn trees, which are less likely to be affected by the disease.

If you do notice symptoms of Cedar Hawthorn Rust Disease on your trees, there are several fungicides available that can help control the spread of the disease. These fungicides should be applied in the early spring, before the telia appear on cedar trees.

In addition to fungicides, you can also try removing infected leaves and fruit from your trees, and pruning any infected branches. This can help reduce the spread of the disease and give your trees a chance to recover.

Cedar Hawthorn Rust Disease is a serious threat to your landscape, but with early detection and proper treatment, you can protect your trees and prevent the spread of the disease. If you suspect that your trees may be infected with Cedar Hawthorn Rust Disease, contact a professional arborist or horticulturist for advice on the best course of action.

Cedar Hawthorn Rust Disease on Cedar tree

Cedar Hawthorn Rust Disease on Hawthorn tree

Cedar, Hawthorn, Plant Diseases, Fungal Diseases, Horticulture, Arboriculture