If the foliage looks,’Rusty’, yellow to orange / red markings then you have Azalea Rust. Azaleas are perennial members of the Rhododendron genus, commonly grown for their showy, spring blooming flowers. Leaf rust is a common azalea fungal disease that, though rarely serious, causes unattractive foliage spots. The Rhododendron genus encompasses a wide range of shrub species, including azaleas. Rust – Yellow Markings on Azaleas. Extension service websites with advice on dealing with insects and diseases: Consult these sites for photos of insect and disease problems. Please note: This content may be out of date and is currently under review. Normally this problem strikes during late summer. It has been observed that the inner parts of the bark of the dying branches develop a reddish brown discoloration. The most common rhododendron disease is stem dieback, which is characterized by death of the branches, in an otherwise healthy plant. The wings are highly sculptured, giving them a lacy appearance. 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. Avoid treating the azalea for rust without making sure it is infected. This condition is caused by a fungus called Botryosphaeria dothidea. Rhododendron shrubs are susceptible to many different diseases, both fungal and viral in nature. 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. Azalea diseases pictures. Admin March 10, 2020. Like any plant in the garden, azaleas are susceptible to a range of specific diseases which may mar the beauty of the plant. herald spring with a profusion of flowers in U.S. Department of Agriculture plant hardiness zones 5 through 9. A few to watch for include: Leaf Spot Fungus: This is characterized by red to brown colored round spots on the leaves. Other Azalea Problems. The adults also have some dark markings on the back and wings. 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. Fungal Diseases in Azaleas. The name Azalea is used to refer to evergreen Oriental species and hybrids, as well as deciduous native plants. 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. Azaleas (Rhododendron spp.) Page last updated: Monday, 9 June 2014 - 9:36am. Under severe conditions, the … Of all the azalea health problems that you may encounter, fungal diseases are probably the most common. Rhododendron usually refers to evergreen plants with large, leathery leaves. 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