This condition is caused by non availability of micronutrients, that are necessary for the healthy growth of these plants. How do I calculate the amount of sod required. Control Phyllosticta leaf spot disease by raking up all fallen leaves and avoiding the use of overhead watering to prevent wetting of the leaves. Such yellowing can be caused by pollutants too. Gardenia flowers exude an aroma fit for the gods - in my opinion their scent is sweeter than the most fragrant rose. The black nymph lace bug also congregates on the leaf's underside, which adds to the black discolouration of the foliage. Aphids are a maximum of 1/8-inch long, pear-shaped, and green, pink, black, dusty gray or white fluffy-coated insects that cluster on leaves, buds, and young stems. The bud eventually falls off and dies without blooming. Treating with a fungicide won't help, but you could try to move the whole plant to higher ground or a raised bed to see if it can recover. Sooty mold on rhododendron foliage is easily rubbed off with your fingers. Aphids, scales, whiteflies and mealybugs produce this sugary, sticky substance. That black substance is probably sooty mold growing on the deposits of honeydew (excrement) left by an insect. Troubleshoot your rhododendron by taking a small cutting to a local Master Gardener for a diagnosis. Examine your plant carefully, using a magnifying glass if necessary to identify the culprit. Wilting, browning at the edges, brown spots in the center of the leaf or very dark green veins are all signs of different problems. 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. black dots (fruiting structures of fungi) are sometimes visible in the center of the spot or in con-centric rings. This issue sponsored by: My rhododendron has a black, sooty substance on its leaves and stems. It is often a homeowners’ first sign of trouble in the landscape. I have noticed on our rhododendron that the leaves are covered in a black substance. Azalea leaves may be slightly more narrow and pointed than rhododendron bush leaves. 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. The best way of controlling sooty mold is to control the insects that produce honeydew. 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. If the roots are mushy and black instead of firm and tan-colored, that means root rot has set in. What is it and how can I correct this problem? These micronutrients include iron, manganese, and zinc. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. The flowers are abundant, showy and vivid. But if left untreated, it will shade the leaves, reduce growth, and invite other unwanted guests to dinner. Apply a fungicide to protect leaves before infection in the spring. Chlorosis is a disease characterized by yellowing of rhododendron leaves. Determining the underlying problem is necessary to restore the rhododendron's health. Later, the buds may turn silvery grey before becoming covered in small black bristles Powdery mildew : On evergreen rhododendrons, actual growth of the fungus on the lower leaf surface can be hard to detect, but infection tends to cause pale green, reddish-purple or yellowish patches on the upper surface More importantly, you need to find the source of the honeydew. and Botryosphaeria dothidea cause the stems and foliage to die. 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