A few to watch for include: Leaf Spot Fungus: This is characterized by red to brown colored round spots on the leaves. Page last updated: Monday, 9 June 2014 - 9:36am. The wings are highly sculptured, giving them a lacy appearance. Rhododendron shrubs are susceptible to many different diseases, both fungal and viral in nature. Look for a fungicide at your local nursery. The Rhododendron genus encompasses a wide range of shrub species, including azaleas. Rust – Yellow Markings on Azaleas. Rhododendron usually refers to evergreen plants with large, leathery leaves. Please note: This content may be out of date and is currently under review. The name Azalea is used to refer to evergreen Oriental species and hybrids, as well as deciduous native plants. Of all the azalea health problems that you may encounter, fungal diseases are probably the most common. Azalea plants are members of the Rhododendron species, and sometimes the names are used interchangeably. Other Azalea Problems. Powdery Mildew Azalea Lace Bug: Azalea lace bug (Stephanitis pyrioides) is a major pest of azaleas in South Carolina.Lace bug adults are about ⅛-inch long. Look for tiny, round, yellow spots on the upper surfaces of leaves, and orange colored pustules on the undersides. Extension service websites with advice on dealing with insects and diseases: Consult these sites for photos of insect and disease problems. Azaleas are perennial members of the Rhododendron genus, commonly grown for their showy, spring blooming flowers. Admin March 10, 2020. Normally this problem strikes during late summer. Most diseases dont warrant chemical treatment, except for in cases of severe infection. Azalea diseases pictures. Avoid treating the azalea for rust without making sure it is infected. Insecticidal Soap As An Azalea Lace Bug Control by Stanton A. Gill & Michael J. Raupp Root Weevils: Troublesome Rhododendron Pests by Hank Helm Thrip Information by UC Davis IPM. If azalea foliage or flowers are being spoiled by lace bug or petal blight, preventative action – taken at the right time of year – can ease the problem. This condition is caused by a fungus called Botryosphaeria dothidea. The most common rhododendron disease is stem dieback, which is characterized by death of the branches, in an otherwise healthy plant. It has been observed that the inner parts of the bark of the dying branches develop a reddish brown discoloration. Under severe conditions, the … For this one check the soil conditions, Dry, Wrong Ph, Low on nutrients then your Azalea is stressed and probably has a fungal disease. Azalea pests and diseases. Fungal Diseases in Azaleas. Rhododendron spp.. Anthracnose – Leafspot and Dieback (fungus – Glomerella cingulata): Symptoms on leaves are characterized by numerous small, round spots on both leaf surfaces.The spots are light to rusty-brown with a definite margin. herald spring with a profusion of flowers in U.S. Department of Agriculture plant hardiness zones 5 through 9. Like any plant in the garden, azaleas are susceptible to a range of specific diseases which may mar the beauty of the plant. Fungi on Azaleas. Azaleas (Rhododendron spp.) Identify symptoms of the disease on the azalea to make sure the infection is present. If the foliage looks,’Rusty’, yellow to orange / red markings then you have Azalea Rust. Leaf rust is a common azalea fungal disease that, though rarely serious, causes unattractive foliage spots. The adults also have some dark markings on the back and wings. With insects and diseases: Consult these sites for photos of insect and disease problems by death of disease... 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