9). The plants are members of the Rhododendron genus, and many species grow in U.S. Department of Agriculture plant hardiness zones 8 to 10. The foliage remains deep green through the winter. And the sweet fragrance of the flowers is a bonus. Banks and Slopes, Cottage/Informal, Beds and borders, Wallside and trellises. Mother Nature may seem cruel but Phytophthora dieback is her efficient method of winnowing out the weakest and least adapted plants. Insectidical soaps and pesticides are helpful for control, and early season control (from March to May) may prevent later problems. As soon as you notice leaves with rust, remove them from the plant. These pathogens thrive in moist and warm conditions. The spores of these diseases need a moist environment in which to prosper. Azalea leaf gall (Exobasidium japonicum) Leaf spots (predominantly Colletotrichum gloeosporioides, but occasionally other fungi) Rust (Chrysomyxa rhododendri) They are also attacked by more generalist diseases such as; Honey fungus (Armillaria spp.) Plants die rapidly. She has a Bachelor of Arts in philosophy and is an avid gardener and sports fan. Lace bug adults are about ⅛-inch long. Read label directions beforehand so you know how much water to add to the concentrate, if necessary. Root Rot Thick, curled leaves. Diseases includ canker, crown rot, root rot, leaf spot, rust, and powdery mildew. The spores from the pustules spread easily to other leaves on the shrub, especially in damp or wet conditions. Collect clippings in the tarp and add to a garbage bag. If there are just a few insects, remove by hand. https://homeguides.sfgate.com/azalea-care-rust-treatment-25809.html I would recommend it for any fungal problem listed on the label. The adults also have some dark markings on the back and wings. However, the fungal disease rust can mar the appearance of deciduous azaleas and damage leaves. A: Azaleas drop old leaves, but also can drop leaves if the plants are stressed. It is found almost wherever azaleas are grown. Key Points. Circular yellow flecks appear on the upper side of affected leaves, and patches of rust-colored spores grow on the under sides of the leaves. On average, rhododendrons are larger shrubs than azalea plants, and they have larger leaves. Clemson Cooperative Extension; Azalea Care; Debbie Shaughnessy, et al. In moist, humid climates, azalea shrubs fill the yard with blossoms from spring to autumn. I have scores of azaleas (different colors) - perhaps 60+ years old - and have noticed many, many of them have some kind of fungus on them which appears to be killing the branches, and sometimes the entire plant. Rust: This is a fungal disease that appears as yellow, orange, red, or brown raised bumps or blisters on the undersides of leaves. Rust spores travel to other plants via air currents and water splashes. Now they are slowly dying. Commonly, these foliage diseases contribute to leaves turning brown and premature leaf drop. Brown spots on Azalea leaves are common yet treatable. Leaf rust is a common azalea fungal disease that, though. If you do not want to deal with the rust problems, buy cultivars of azaleas that are resistant to the disease such as “Gibraltar,” “Balzac” and "Red Letter.” Species and cultivars that are highly susceptible to rust include pinxterbloom (R. nudiflorum), plumleaf (R. prunifolum), swamp (R. viscosum), “Klondyke,” “Ilan Primrose,” “Ilam Peachy Keen", “Rufus,” “Llam Pink William,” and “Sunrise.” Avoid planting azaleas near other plants that are susceptible to rust. Some leaf gall-causing diseases include azalea leaf gall, camellia leaf gall, and even some rust pathogens. The types that infect azaleas include Pucciniastrum myrtilli (P. vaccinii) and Pucciniastrum vaccinii. Affected leaves may also curl up and drop. If infected foliage is left wet overnight, the spores in the pustules spread to other parts of the plant, or to new plants altogether by air currents or splashing water, thus increasing infection. If a leaf has brown areas with white spots, it probably has a local fungal infection of Pestalotia leaf spot. Rust can also attack turf. In many cases it is Lace Bug, you can barely see them, but if you take the time to look at the underside of the foliage you can see little black spots. The larvae of the caterpillars then curl the leaf tip over and web it into place. They MUST have acid soil with a Ph of 5.0 to 6.5. fungus or mold on azalea bushes. Cultivation. Of the six rusts in North America, the hemlock-blueberry rust, Puccininastrum vaccinii, is the most common rust infecting deciduous azaleas in Maryland.It is only sporadically severe. Two have become entirely discolored with what I assume to be Azalea Rust. Forward/Disclaimer. Q: Before Ike, my mature azaleas dropped leaves. Spots may become tan in the center and may have a yellow halo. This is seldom controlled with fungicides and is best mitigated by good sanitation and avoiding excessive moisture. Rust spots on azalea leaves. Mites are another common foe of the azalea, and like their friends, … On the underside, pustules containing orange-red spores develop. Gardeners may first notice this problem as leaves turning white and dropping. Signs of Azalea Leaf Gall. Avoid treating the azalea for rust without making sure it is infected. Adopt proper cultural practices to keep the disease from developing on your azaleas in the first place. Of all the azalea diseases, rust is perhaps one of the more troublesome, because the fungus that causes the disease can rapidly reproduce. There are a number of different Rhododendron diseases, with the most serious being root rot and dieback of the branches. Rust fungus grows within the leaf so there is usually a copy of the spores on the underside of the leaf as well. Rust on azalea. Water spurs the growth of pustules, and as long as leaves are wet, new pustules will appear until they cover the surface of the leaf’s underside. Chemical controls may Rust fungus can overwinter in fallen leaves and infect plants when the weather warms up in the spring. Within the rhododendrons, themselves, leaf-size comparisons are used to make a further division between large-leaf and small-leaf types. Dispose of severely infected plants. This plant has purple triangular-shaped foliage, making it an ideal choice for containers, borders or as an indoor plant. Azalea Lace Bug: Azalea lace bug (Stephanitis pyrioides) is a major pest of azaleas in South Carolina. Cylindrocladium scoparium: Rake and destroy fallen leaves. Azalea leaf miner (Caloptilia azalaella) Caterpillars feeding inside azalea and rhododendron leaves cause angular areas of leaf damage which then go brown. Brown spots on Azalea leaves are commonly caused by a … They do NOT like clay soils. ; March 2001. Leaf Rust. Knot the garbage bag firmly before disposing. Rhododendron and azalea shrub bushes in garden use, closeups of flowers, different varieties, lots of colors, pink, red, blue, white, yellow, orange, in spring, fall, summer, pruning, plant habits, autumn foliage colors, new spring growth examples, shade garden uses, with spring bulbs and more. They conjure up lovely images for me. The shrub has a slow growth rate and typically doesn’t require much pruning. Further details on rust diseases It shows up as a scattering of orange, yellow or red spots on foliage. Here is a fact sheet from the University of Maryland about diseases and insects of azaleas and rhododendron. Causes of rust spots on leaves: Rust is caused by a group of fungi from the Pucciniales order. Azalea Leafminers – This azalea plant pest generally “mines” between the upper and lower surfaces of leaves causing brown blisters or yellowing on the leaves. Clean any foliage debris from around plants, as the fallen leaves may also be infected. However, azaleas are susceptible to a variety of fungal diseases including leaf spot and rust. Identify symptoms of the disease on the azalea to make sure the infection is present. Phytophthora on Azaleas and Rhododendrons. Why Are the Leaves on My Begonia Wilting?→. Look for tiny, round, yellow spots on the upper surfaces of leaves, and orange colored pustules on the undersides. What are Mites and How to Get Rid of Them. The wings are highly sculptured, giving them a lacy appearance. 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