Rhododendron Archives
Insects and diseases that can affect Rhododendron (Rhododendron).
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Azalea and Rhododoendron Diseases
Informational table showing disease name, symptoms, pathogen/cause, and management of Azalea and Rhododendron diseases.
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Azalea Bark Scale
The adult female azalea bark scale is dark red with short legs and antennae and long, sucking mouth-parts.
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Black Vine Weevil
The black vine weevil is a serious pest in nurseries and established landscape plantings.
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Botryosphaeria Canker
The fungus Botryosphaeria can cause a branch dieback on many woody ornamentals. Cankers girdle and kill twigs and branches of species such as horsechestnut, redbud, dogwood, beech, walnut, tulip poplar, sweetgum, crabapple, pine, oak, rhododendron, azalea, rose, willow, elm, and yew. Small black fungal fruiting structures which contain fungal spores develop in the canker.
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Phytophthora Root Rot and Crown Dieback
Fungus-like organisms belonging to the genus Phytophthora are soil- or plant-borne and all are plant pathogens.
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Rhododendron and Azalea Care
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Rhododendron Borer
The rhododendron borer is one of the smallest clearwing borers found in Pennsylvania.
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Rhododendron Lace Bug
Twenty-eight lace bug species have been recorded in Pennsylvania, but only a few are key pests of ornamental evergreen plants like azalea and rhododendron.
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Rhododendron Tip Midge
The rhododendron tip midge is a light-brown, 1.25-mm-long fly.
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Southern Red Mite
The female adult is about 0.38 mm long and resembles a small spider.
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Whitefly
Whiteflies are white insects with pale yellow bodies that are approximately 2 mm long.