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| Tissue proliferation
Rhododendron
Disease
Armillaria root rot
Botrytis shoot blight
Gray blight
Leaf spot
Lime-induced chlorosis
Marginal leaf necrosis
Physiological leaf spot
Phytophthora blight
Phytophthora root rot
Powdery mildew
Ramorum leaf and shoot blight (Sudden oak death)
Rust
Salt injury
Sunburn
Tissue proliferation
Insect
Aphids
Azalea bark scale
Caterpillars
Lecanium scale
Rhododendron lace bug
Rhododendron whitefly
Root weevils
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Caption: Rhododendron tissue proliferation
Photo by: R.S. Byther
Rhododendron : Tissue proliferation
(revision date: 4/23/2014)
Use Integrated Pest Management (IPM) for successful plant problem management.
Biology
There is no known cause of tissue proliferation, but it is currently believed to be a genetic abnormality. A swollen area or gall develops at the base of the trunk or (more rarely) on a shoot. Otherwise, the plants appear to be healthy. Numerous small sprouts may develop from the swollen area, which may deteriorate after several years. Plants may break at the site of the swelling. Tissue proliferation is apparently noninfectious, and does not seem to be spread by grafting. Tissue proliferation is also occasionally observed on azaleas.
Management Options
Non-Chemical Management
Give plants proper cultural care to maintain good health.
Do not force into accelerated growth.
Select non-chemical management options as your first choice!
Chemical Management
IMPORTANT:
Visit Home and Garden Fact Sheets for more information on using pesticides
None recommended
Images
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Caption: Rhododendron tissue proliferation
Photo by: R.S. Byther