Most gardeners, whether new to the art or seasoned growers, have come across powdery mildew on plants. It is in the soil, but not in a form that rhododendron roots can absorb. Phytophthora thrives in wet soil or poorly drained areas where the plant is installed. When the infestation is severe, it can cause the petal-shaped leaves to drop from the plant. The hardy leaves of the rhododendron can lose their lovely appearance due to several diseases attacking the garden favorite. You can also use products that contain imidacloprid or dinotefuran to spread around the soil to keep creepy crawlers from making purchase in the soil or climbing up the lower branches of the hardy rhododendron or azalea. 10). Gall: the azalea gall fungus produces airborne spores on the white bloom that develops on the galls. Seldom causes enough damage to warrant control. The most frequent problems of rhododendrons mostly fall within nutritional imbalances or insect problems. Mon – Fri | 9am – 5pm, Join the RHS today and support our charity. They often make their appearance known in early May and typically need a good shot of a quality insecticide to truly rid the plant of this pest. The gorgeous greenery of rhododendrons can be affected by flying pests that enjoy its leafy branches. Solve problems. Fungal Diseases. Determining the underlying problem is necessary to restore the rhododendron's health. One of the most common creepy cruds that cause issues with azaleas and rhododendrons is a fungus known as water mold. The main cause of unsightly foliage or a lack of flowers is fungi. You’ve put in the work and waited all year for the blooms to begin on your rhododendron or azalea. Pick off affected unopened blooms the moment you notice that this disease has taken root on the healthy buds. Chemicals: using safely and effectively times, RHS Registered Charity no. You’ll have to evaluate your cultural practices to determine the problem and take appropriate steps for treating yellowing rhododendrons. Signs of rhododendron distress can usually be traced to incorrect culture or siting. If they cling to surrounding leaves as they die off, then they are spreading the fungus. Inclusion of a product does not indicate a recommendation or endorsement by the RHS. From bright pinks to deep golden hues, there are many different rhododendrons and azaleas from which to choose that require a little less maintenance to keep disease and blight far from its foliage and blooms. Various fungi cause branch and twig dieback, collar, root and crown rot and leaf spot diseases on rhododendron plants. Not all rhododendrons are azaleas, but all azaleas are rhododendrons. Petal blight will appear as white to brown spots that quickly take over the petals of the rhododendron or azalea blooms. Even pests like aphids, bark beetles, spider mites, scales, weevils, and caterpillars can attack this plant. This is specifically one of the most common ailments that affect azaleas and rhododendrons. The Royal Horticultural Society is the UK’s leading gardening charity. However, there are a few fungal diseases that crop up. Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners), Chemicals: using a sprayer Unfortunately, there isn’t a specific time period, as fungi will attack at any time of the year. 020 3176 5800 Powdery Mildew Powdery mildew is a common fungal disease that’s easily recognized by the white, powdery spores that cover the leaf surfaces. Common Abiotic (Non-Pathogenic) Problems of Rhododendrons and Azaleas. Inclusion of a product does not indicate a recommendation or endorsement by the RHS. Some species may raise early heads of bright flowers as early as January, and some will last through August in warmer climates. They range from light green to a purplish or reddish color. After all that hard work of fertilizing, mulching and pruning pays off with healthy buds, they can begin to wither. The bud eventually falls off and dies without blooming. The higher the soil's pH is, the less iron is available to the plants. The most significant are powdery mildew and bud blast. Always wash clippers and other gardening tools after use to avoid spreading spores from affected buds.
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