Maintain good air circulation. Rhododendrons grow best in soil that is consistently moist but never soggy. You must have JavaScript enabled in your browser to utilize the functionality of this website. Faint yellow areas form on expanded leaves. Mulch to retain moisture and provide protection. Waterlogged roots suffocate and shut down, leaving no avenue to replace water lost to drying winds and sunlight. Compare these symptoms to those of Botryosphaeria described above because these diseases are readily confused. Spots enlarge rapidly. May 8, 2015 | Gardens. Small tan to black spots form on leaves and expand to engulf the entire leaf. Remove and destroy all galls before they become white with new spores. Properly dispose of the infected plant parts far away from rhododendron shrub. Rake and destroy fallen leaves. Use clean, disinfested tools. As a thank you for joining our campaign, we’ll gift you our brand new eBook,. If many plants had the disease in previous years and galls were too numerous to pick, apply a fungicide. The two primary reasons that rhododendron leaves turn brown are cold weather and rhododendron wilt. Rhododendron hybrids considered to have some resistance include Boursault, Cunningham's White, English Roseum, Lebar's Red, Roseum Elegans, and Roseum 2. Gray fungal growth covers infected petals. Or roots die and plants wilt without having leaf spots form. Space plants to ensure good air circulation and to avoid excessively high humidity. Get notified when we have news, courses, or events of interest to you. Again, there are a number of reasons why you don’t have any buds … Leaves turn brown to black and fall in 3 to 4 days. None are blooming yet. The new spores formed on the surface of the galls are dispersed but do not cause more galls to form during that same season. Apply a fungicide to protect plants. Rake and destroy fallen leaves. Another disease that could cause discoloration such as brown or yellow on the leaves of the rhododendron is phytophthora. The following is a brief introduction to the disease control methods of Rhododendron. At the first sign of brown spots, whether caused by an infection or a physiological problem, remove the affected leaves before the spots spread beyond the initial sites to the rest of the plant. This could happen due to the hot sun or cold winter winds. Especially inspect southern-grown, containerized material before planting. Happy holidays from all of us at Gardening Know How. Dead bark falls off the cankered area. This kind of damage is most likely due to unfavorable environmental and weather conditions. Rough, sunken, dark-brown areas form around wounds or natural openings in the bark. Check with your local Cooperative Extension Office for assistance. The main diseases of Rhododendron are root rot, brown spot and iron deficiency chlorosis. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. White fungal growth forms on the yellow areas of some cultivars while only small dead spots with no fungal growth occur on other cultivars. See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement. Stems have brown spots on which white masses of spores later form. Few (Or No) Flower Buds Form. Roots with few feeder roots die. The former is a naturally occurring phenomenon that takes place as the result of changing weather patterns and doesn't necessarily indicate a dead plant. Rhododendron pests and disease harm plants that are stressed due to environmental conditions or injury. Leaves curl up to protect moisture loss and will eventually die. LEARN HOW TO STOP THE INVASIVE SPOTTED LANTERNFLY, Coronavirus: Information and resources for the Extension Community, Prepared by Gary W. Moorman, Professor of Plant Pathology. The browning, cupping and sectioning also suggests possible herbicide poisoning. Informational table showing disease name, symptoms, pathogen/cause, and management of Azalea and Rhododendron diseases. No obvious fungal fruiting structures are formed. Circular to irregular brown spots up to 1/2 inch in diameter form on leaves, … Underwatering has the same effect. Sign up for our newsletter. Why do we need this? In the top dieback phase, leaves have dark-brown spots. 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