herald spring with a profusion of flowers in U.S. Department of Agriculture plant hardiness zones 5 through 9. By entering your email, you consent to receive communications from Penn State Extension. Azalea Diseases. Issues With Rhododendrons: Dealing With Rhododendron Insect Problems And Diseases. An azalea plant with wilted, drooping foliage may be suffering from root rot (also known as the fungus Phytophthora). Normally this problem strikes during late summer. Among the more common pests in the azalea garden are lace bugs, named for their structured, lacy wings. Apply a fungicidel as blossoms open. Avoid overhead watering. Other diseases of Rhododendron include petal blight, leaf gall, and leaf ing these plants under ideal cultural practices can help prevent most Rhododendron diseases and pests. One of the most common problems with azaleas is the ‘black spots’ that appear on the foliage. Spots enlarge rapidly. Most azalea problems are easier to prevent than to cure. Small tan to black spots form on leaves and expand to engulf the entire leaf. Use clean, disinfested tools. However, there are a limited number of diseases and pests which can damage this member of the rhododendron family and ruin the springtime celebration. White fungal growth forms on the yellow areas of some cultivars while only small dead spots with no fungal growth occur on other cultivars. Disinfest the pruning shears frequently. The azalea is a relatively low-maintenance flowering shrub that produces a beautiful show of color each spring. Pale-white to rust-colored spots form on petals. She writes features and columns on a variety of topics, including the outdoors, faith and health/wellness. Azalea Diseases and Care. If your plant's leaves turn to a dull grey-green color or are covered in a fine webbing, wipe the undersides of several leaves with a sheet of white paper. Treatment involves removing the infected leaves, and changing the mulch around your plants, as this fungus survives the winter in the ground soil. They remain dormant until the following spring. Identifying Azalea Bark Scale. Treatment involves removing the infected leaves, and changing the mulch around your plants, as this fungus survives the winter in the ground soil. The leaves become curled, fleshy, and pale green to white. Fungicide applications to infected plants merely delay eventual death. The name Azalea is used to refer to evergreen Oriental species and hybrids, as well as deciduous native plants. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Blackened branches, covered by a sticky soot and white, cottony fluffs in the crotches of the lower branches are all symptoms of one of the most dreaded of azalea diseases. Fungal Diseases in Azaleas. Roots with few feeder roots die. Space plants to ensure good air circulation and to avoid excessively high humidity. Applications can cease when the leaves reach their full size. Purchase disease-free plants. Infection occurs in the spring. By: Susan Patterson, Master Gardener Printer Friendly Version. View our privacy policy. Chocolate-brown cankers enlarge along the branch more quickly than around its circumference. Stems have brown spots on which white masses of spores later form. The leaves will also have orange gelatinous spots and can become distorted or stunted. These become white due to the formation of spores by the fungus on the surface. Tiny black fungal fruiting structures that pepper the dead bark are most easily seen on the light tan bark. No chemicals adequately control this disease. Faint yellow areas form on expanded leaves. Remove fading flowers and yellowing leaves. Water in a manner that keeps plant surfaces dry. Webbing may develop. Despite the long list of problems listed Azaleas are actually relatively easy to care for and for the most part are disease and pest free. The new spores formed on the surface of the galls are dispersed but do not cause more galls to form during that same season. More on Mildew by Fred Minch Pests Of Rhododendrons by Arthur L. Antonelli Insecticidal Soap As An Azalea Lace Bug Control by Stanton A. Gill & Michael J. Raupp Root … Azalea plants are members of the Rhododendron species, and sometimes the names are used interchangeably. Circular to irregular brown spots up to 1/2 inch in diameter form on leaves, especially lower leaves. Young leaves and flowers become swollen, fleshy, and pale green. Remove severely infected plants. They vary in height and … Rhododendron bushes are similar to azaleas and members of the genus Rhododendron. Follow their label safety precautions such as gloves and other protective measures to avoid personal harm, and follow their label rates of dilution and application to avoid harm to the plants and environment. Rake and destroy fallen leaves. This occurs when the plant is in poorly-drained soil or excessively wet conditions. Avoid late afternoon watering. The following are challenges you can watch for in your plants. Plan the perfect garden with our interactive tool →, hose on lawn image by Coralie Palmeri from, Clemson Cooperative Extension: Azalea and Rhododendron Insects & Pests, Clemson Cooperative Extension: Azalea and Rhododendron Diseases. Gardeners may first notice this problem as leaves turning white and dropping. azalea diseases pictures Diseases & Insects of Azaleas Garden Guides Rhododendrons (including deciduous azaleas) may be attacked by several diseases, causing unsightly foliage or a lack of flowers. A frequent inspection of your plants--including the undersides of leaves--to detect insect activity may catch a small infestation before it becomes a major problem. Apply a fungicide to protect plants. More information on successfully growing azaleas and rhododendrons is available in the fact sheets HGIC 1059, Azalea Care; HGIC 1058, Azalea Planting; and … Maintain good air circulation. This can be prevented by planting in well-drained, well-aerated soil. The adults also have some dark markings on the back and wings. What begins as a "freckled" appearance on blooms can quickly turn to larger, watery spots which cause … Antonelli, et al. Azaleas (Rhododendron spp.) 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. Warning : Horticultural chemicals tend to work because they are harmful. Why do we need this? Following a diagnosis confirming that the plant is infected, remove infected plants. You must have JavaScript enabled in your browser to utilize the functionality of this website. Petal blight is another common problem and affects the flowers on the azalea. No obvious fungal fruiting structures are formed. Common problems of rhododendron bushes can be avoided by providing the best growing environment possible and maintaining a consistent pruning, mulching and … Facebook; Twitter; Google+; Pinterest; Azalea Care. Apply a fungicide to protect plants. Affected leaves eventually turn brown and should be removed and destroyed. Apply a fungicide to protect leaves before infection in the spring. Rhododendrons bloom in late spring and provide a burst of color before summer flowers set in. The azalea is a relatively low-maintenance flowering shrub that produces a beautiful show of color each spring. Shoots die from the tips back as dark-brown cankers form. Many diseases and other problems can be prevented by following the recommended cultural practices for proper planting and care. A healthy environment is the key to preventing diseases, insect and fungal problems. Insectidical soaps and pesticides are helpful for control, and early season control (from March to May) may prevent later problems. If mites are present, there will be red streaks on the paper. Infected leaves may fall. Black branches are the result of mold growing on the honeydew excreted by this azalea pest.

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