A few common insect problems are lace bug, mites and scale. Few diseases of rhododendrons are also prevalent. ... Phytophthora root rot and top dieback: Plants are stunted and wilted. Keep these flowering plants in acidic, well-drained soil with a pH of 4.5 to 6.0. More information on rhododendron diseases and insects is available in the fact sheets HGIC 2050, Azalea & Rhododendron Diseases, and HGIC 2051, Azalea & Rhododendron Insect Pests. Even pests like aphids, bark beetles, spider mites, scales, weevils, and caterpillars can attack this plant. Rhododendrons are lovely plants with enchanting blooms that range from dark red to lavender. The symptoms are (usually) a sudden collapse during the growing season, usually of the whole plant or … Common problems of rhododendron bushes can be avoided by providing the best growing environment possible and maintaining a consistent pruning, mulching and fertilizing program. Unfortunately, these plants are attacked by two very widespread and serious disease complexes: root rot and dieback. Prevent rhododendron root rot by following proper care requirements for your plants. The most common cause is the disease Phytophthora cinnamomi. Proper use of fungicides. Some of the most common dangers to your rhododendron include aphids, root rot and Japanese beetles. ... rhododendrons), symptoms nos. Root rots must be managed early in the disease if the losses are to be avoided. New leaves may even emerge completely yellow. DEAR LOIS: It appears your rhododendron is afflicted with phytophthora root rot, caused by an oomycete, which is an organism similar to a fungus. Proper diagnosis of the cause of the root rot. Phythopthora and other serious fungal diseases Root rot/wilt. Management In Established Plants Is Based On. Rhododendron hybrids considered to have some resistance include Boursault, Cunningham's White, English Roseum, Lebar's Red, Roseum Elegans, and Roseum 2. There are various other rhododendron diseases, like leaf spots, and root and crown rot. Rhododendron pests and disease harm plants that are stressed due to environmental conditions or injury. Leaves yellow, and the entire plant eventually dies. Homeowners should be on the lookout for this pest. The plants are able to survive and bloom for many years. The following is a brief introduction to the disease control methods of Rhododendron. Phytophthora cinnamoni is a root disease which is usually fatal and often kills a plant extremely quickly. Diseases of Rhododendrons. Rhododendrons thrive in filtered sunlight and experience damage by full sun exposure; plants in decline or stressed plants are more susceptible to diseases like root rot. Rhododendron grows weak, leaves wilt, dry and die directly when it is seriously ill. How can a flower lover bear to see such a situation? The main diseases of Rhododendron are root rot, brown spot and iron deficiency chlorosis. Diseases might include root rot, blight and dieback. PHYTOPHTHORA ROOT ROT AND DIEBACK OF RHODODENDRONS AND AZALEAS IN THE MIDWEST Species of Rhododendron, which include azaleas as well as rhodo dendrons, are colorful flowering shrubs tha t are be autiful a dditions to any landscape. No chemicals adequately control this disease. These include: Chlorosis – Chlorosis, an iron deficiency, is common in rhododendrons and causes leaves to turn from a rich dark green to a light green or even yellow. Growth of infected plants slows as compared to healthy plants. While leaf spots can be controlled with a fungicide, root and crown rot can be prevented to some extent by planting rhododendrons in well drained soil. 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