Diagnos rhododendron virus

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Phomopsis Dieback- Phomopsis spp. Phytophthora Dieback- Phytophthora spp. Leaf and Flower Gall- Exobasidium spp. Powdery Mildew- Microsphaera penicillata Sphaerotheca pannosa Erysiphe cruciferarum 6. Leaf Spots- Many different fungi 7. This fact sheet lists the common insect and disease problems that occur on rhododendrons in Connecticut. Common Problems: A. Biotic Problems caused by living agents : 1. Diseases 2. Insects B. Abiotic Problems caused by nonliving agents : 1.

Cultural 2. A new section on virus diseases has been updated to include azalea ringspot disease, Rhododendron virus N, and Rhododendron virus A and related viruses. The section on pest management has been expanded and includes a table that identifies the insecticides and miticides used to manage these pests. A comprehensive index, an appendix that presents an updated list of common plant disease names for rhododendron and azalea, and a glossary of terms are provided as well.

Symptoms Necrotic rings become apparent in 2-year-old leaves. Current-season growth and flowers are unaffected. Concentric rings become more numerous during the growing season. Leaves generally turn red or yellow and fall prematurely from the plant. Remove dead or damaged wood at any time. Pruning to shape the plant or to keep it within bounds should be done after flowering. Deadheading is an important type of pruning. Break out only the spent blooms to avoid damaging the dormant buds. Another form of pruning is called disbudding.

It involves pinching out the terminal leaf bud on new growth, thus awakening dormant buds and causing side branches to appear. Disbudding is done on new growth and can be done again in the fall. Be careful not to break off a flower bud. Disbudding is a useful technique in shaping plants or making them more compact. Rhododendrons are susceptible to a wide variety of pests; however, when properly sited, planted and maintained, pest problems are limited. Following two to three years of establishment, rhododendrons require very little maintenance and are relatively pest free.

When problems do arise, take care of them immediately, before they get out of hand and worsen or spread to other shrubs.

Diseases might include root rot, blight and dieback. A few common insect problems are lace bug, mites and scale. Borers are an occasional, but serious, problem. Homeowners should be on the lookout for this pest. Hybrid rhododendrons are usually considered to be the more adjustable for various garden and climatic situations. The crossing of two or more parents gives us a wide range of adaptability from which to choose. A great number of them are descendants of our southern native Catawba rhododendron R.

The hybrids listed in Table 2 are among those that do well in South Carolina. When you plan to purchase a rhododendron, go to or order from a reliable nursery and buy a named variety.

The shrub should be well-branched, with four or more limbs close to the ground. Look for self-rooted plants; grafts are not desirable here. The native species are suitable in many areas. A variety with R. The following tables contain the names of some of the species and hybrids that do well in South Carolina:.

One of the hardiest native evergreen rhododendrons. Catawba rhododendron or purple laurel or mountain rosebay R. Considered by many to be the finest of all native American shrubs. Rhododendron growers know it for its extreme hardiness and as the parent of our most hardy hybrids. Heat tolerant. Rosebay rhododendron or Great Laurel R. Flowers are smaller than Catawba rhododendron.