One potential Rhododendron problem is that the leaves are turning yellow. Dieback is a difficult Rhododendron disease to control. PLANT HEALTH. ... disease free rhododendrons that are grown in the open. Rhododendron diseases. Rhododendron Expert Glendoick's Ken Cox discusses Rhododendron Problems, Pests & Diseases. CLIENT CENTRED VETERINARY EXCELLENCE 09 298 8575 enquiries@fvs.co.nz Rhododendron are appealing and colourful shrubs that are available in a wide range of sizes, leaf textures and forms and in shades of pink, red, white, yellow and blue. Epsom Salts* According to the American Rhododendron Society, if the plant has older leaves that have turned yellow between green veins, you likely have a Magnesium deficiency.Sprinkle some Epsom Salts* around the plant to correct the issue.. Iron Sulfate*. common rhododendron symptoms caused by environmental stress factors, insects and diseases are discussed here. YELLOWING OF LEAVES AND NATURAL LEAF FALL IN AUTUMN Rhododendrons, although evergreen plants, do lose some of their leaves. Most varieties hold their leaves for two years and then in the third year, as summer progresses and autumn nears, the lower leaves drop off the stems. The Finest Rhododendrons from around the world available from our online store to the whole of New Zealand. They wont tolerate deep and dry shade and poor drainage/heavy clay soil. A few of the plant toxicities we encounter in New Zealand including rhododendron, buxus, macrocarpa, ryegrass, acorns and ragwort. Leaf gall is a common springtime Rhododendron disease, but it is not particularly serious. Throughout the year, fungal spots (Cercospora species, Septoria species, Phyllosticta species and Colletotrichum species) of various colors appear on azalea and rhododendron leaves.The diseases caused are usually minor, only affecting the aesthetic value of the plant. Brown Spots Scattered brown spots may also appear on the leaf blades of rhododendron during the winter. Infected branches should be pruned well below the discolored wood, then disposed of. If the same symptom appears in new leaves, then it is likely … Rhododendron hybrids considered to have some resistance include Boursault, Cunningham's White, English Roseum, Lebar's Red, Roseum Elegans, and Roseum 2. Botrytis blight: Small, water-soaked lesions develop on … Rhododendrons are quite easy to grow as long as you have well drained but moist acidic soil. Finally, if you create the right conditions most rhododendrons will be subject to fungus diseases. The … Rhododendrons (including deciduous azaleas) may be attacked by several diseases, causing unsightly foliage or a lack of flowers. These low maintenance plants have transformed thousands of gardens for New Zealand homes. One common cause is rhododendron ... Pests and diseases: Usually hardy and easy care, they can be affected by Aphids and Mites which are easily sprayed for. And they wont grow in areas with chalky/limey soil unless in raised beds. You can have a garden that you can manage, and everyone can enjoy. Cases of severe infection may result in early leaf drop, reducing the general health of the plant. No chemicals adequately control this disease. These are usually reflections of poor health in the root system or in the branch. Generally, the conditions will have one of the above three points going for it. Planting in a southern exposure without any protection from the sun nearly guarantees plant death. In general rhododendrons in extreme climates benefit from filtered light and partial shade. As you travel around New Zealand you will notice rhododendrons growing in certain environments that you might not recognise as being particularly textbook conditions. 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