Leaves are the best indicators of plant problems. If it is positioned as an understory feature with taller trees, your plant may not be infested itself, but merely be the honeydew recipient of an “abovestory” tree problem. Rhododendron problems such as sooty mold on leaves ruin the display with unsightly black splotches on the foliage. These fungi com-monly enter through wounds. That black substance is probably sooty mold growing on the deposits of honeydew (excrement) left by an insect. It is often a homeowners’ first sign of trouble in the landscape. Rhododendron Black Satin is an evergreen, semi-erect shrub. Your rhododendron leaves are turning brown because they may be suffering from scorched leaves. The watchwords for you are vigilance and diligence to keep the insects from making your plant a five-star restaurant! The sooty mold itself does not injure the plant. Remove and destroy affected leaves. This could happen due to the hot sun or cold winter winds. Follow the control product’s directions for repeat applications. Click cover to read now! To see if you have whiteflies, just shake a branch. Azalea leaves may be slightly more narrow and pointed than rhododendron bush leaves. Determining the underlying problem is necessary to restore the rhododendron's health. Rhododendron leaves are large, lush and green. Cause: The fungi Phyllosticta, Septoria, Pestalotia are com-monly the causal agents of this malady. Learning how to get rid of sooty mold on rhododendrons means getting rid of the pests that contribute to the fungal disease. Such yellowing can be caused by pollutants too. Be sure to consider where your rhododendron is planted. The bud eventually falls off and dies without blooming. Sooty mold on rhododendron foliage is easily rubbed off with your fingers. These micronutrients include iron, manganese, and zinc. These insects are flat, tan-colored discs on foliage... Whiteflies – Whiteflies are very tiny flying insects that rise above the shrub in a cloud when it is shaken. That black substance is probably sooty mold growing on the deposits of honeydew (excrement) left by an insect. How do I calculate the amount of sod required. Mealybugs are soft, oval, 1/10-inch long insects with distinctly segmented pinkish bodies. You can simply wipe off the sooty mold. There are various other rhododendron diseases, like leaf spots, and root and crown rot. The black speckling on the underside of the rhododendron leaf is caused from the excrement of the insect. These notches can be few or in some cases so extensive that the entire leaf edges end up being jagged and very unsightly! What is it and how can I correct this problem? You may be able to remove part of it with a strong spray of water from a hose. Citrus Sooty Mold Info: How To Get Rid Of Sooty Mold On Citrus Trees, Gardening With Foil: How To Recycle Tin Foil In The Garden, Prickly Kale Leaves – Does Kale Have Thorns, Corn Husk Wreath Ideas: How To Make A Corn Husk Wreath, DIY Air Plant Wreaths: Wreath Making With Air Plants, Sod Webworm Lifecycle: Learn About Webworm Lawn Damage And Control, Cold Frame Construction: How To Build A Cold Frame For Gardening, Coral Bead Plant: Information On The Care Of Coral Beads, Hazelnut Growing: How To Grow Filbert And Hazelnut Trees, Thanksgiving Tradition: Turning Homegrown Pumpkins Into Pie, Growing Thanksgiving Dinner – Must Have Turkey Side Dishes, Interesting Uses For Pecans: What To Do With Pecans, The Bountiful Garden: Bringing The Garden To Thanksgiving. Gardenia flowers exude an aroma fit for the gods - in my opinion their scent is sweeter than the most fragrant rose. The leaves could also turn brown because of a lack of water. black dots (fruiting structures of fungi) are sometimes visible in the center of the spot or in con-centric rings. Copyright © 1996-2020 Michigan Gardener. Aphids, scales, whiteflies and mealybugs produce this sugary, sticky substance. If a lot of cold wind blows past your rhododendron in the winter, it will curl its leaves inward so less leaf surface is exposed; the plant’s trying to keep water from evaporating out of its leaves. Phyllosticta leaf spot is a fungal disease that causes small dots of yellowish-tan to brownish spots on the rhododendron’s leaf surfaces. If the roots are mushy and black instead of firm and tan-colored, that means root rot has set in. It is often a homeowners’ first sign of trouble in the landscape. Examine your plant carefully, using a magnifying glass if necessary to identify the culprit. All rights reserved. Rhododendrons are at their best in spring when they produce large clusters of showy flowers against a backdrop of glossy green foliage. The winged adults are visible and will temporarily fly away. Necrotic Ring Spot. It isn’t a life-threatening condition for the plant, but it … Chlorosis is a disease characterized by yellowing of rhododendron leaves. As soon as you notice the black fungus on rhododendron shrubs, check the leaves carefully to determine which insect is responsible and treat it appropriately. The flowers are abundant, showy and vivid. The symptoms of bud blast on rhododendrons start with the bud turning a silvery grey color before growing black bristles. Pests and diseases are some other reasons for the browning of the leaves. Small, sucking insects such as scale, whiteflies and aphids secrete a sweet sticky substance called honeydew as they feed. and Botryosphaeria dothidea cause the stems and foliage to die. They make an excellent accent plant for your home. Gardenias are my favorite flowering shrub. I always plant my gardenias near a window or door so I can enjoy the fragrant flowers even while I am inside. The leaves are small and dense. Apply a fungicide to protect leaves before infection in the spring. Troubleshoot your rhododendron by taking a small cutting to a local Master Gardener for a diagnosis. Usually the damage is aesthetic and plant health is not in jeopardy. Rhododendron problems like sooty mold don’t have to be an issue. But if left untreated, it will shade the leaves, reduce growth, and invite other unwanted guests to dinner. The fungal infections Phytophthora spp. Although the sooty mold fungus grows on the surface of the leaves and rarely causes permanent damage, it can seriously impact the appearance of the rhododendrons. … Here’s how to help: Whenever the temperature gets above freezing, give your rhododendron a slow and steady trickle of water until the soil feels damp 8-10 inches down. 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