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Compendium of Rhododendron and Azalea Diseases

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Product Description

Fungi are the causative agents of most infectious diseases of rhododendrons and azaleas. Bacteria, viruses, and nematodes have also been implicated as incitants of several diseases recognized on these plants. Infectious disease depends on the interaction of a virulent pathogen, a susceptible host, and a favorable environment. Epidemics occur when all these factors are maximized.

Symptoms of disease vary widely, from rather innocuous blemishes to localized chlorosis or necrosis of plant tissue, to stunting, malformation, and plant death. Correct diagnosis of plant disease depends largely on symptom expression of infected plants.

Because rhododendrons and azaleas are grown for their aesthetic value, disease control is essential to home gardeners and commercial growers.

Contents:  Introduction: Rhododendron & azalea diseases: Infectious agents, Noninfectious agents, Disease control,

Part I. Diseases Caused by Infectious Agents - Diseases caused by fungi: Phytophthora root rot, Armillaria root rot, Phymatotrichum root rot, Pythium & rhizoctonia damping-off & root rot, Botryosphaeria Dieback, Phomopsis Dieback, Phytophthora Dieback, Phytophthora syringae Blight, Other twig blights, Cylindrocladium blight & wilt, Rhizoctonia web blight, Leaf & flower gall, Ovulinia petal blight, Powdery mildew, Leaf spots, Rusts, Diseases caused by bacteria: Crown Gall, by viruses: Rhododendron Necrotic Ringspot, Mosaic & leaf spot, by higher plants: Dodder, by nematodes, by algae: Algal leaf spot & stem infection;

Part II. Insect Pests - Black Vine Weevil & other weevils, Rhododendron Borer, Scale insects & relatives, Other sucking arthropods, Defoiliators, Establishing a pest management program;

Part III. Diseases Caused by Noninfectious Agents - Moisture stress, heat injury & winter injury, Mineral nutrient deficiencies & toxicities, Air pollution injury, Pesticide phytotoxicities;

Part IV. Beneficial Organisms - Micorrhizae,

Aid to Diagnosis, Common names of rhododendron and azalea diseases, Glossary, Index, Color plates.


Duane L Coyier and Martha K Roane, Editors, 1986, 65 p, 80 color plates, b&w photos/illustrations, soft.  $69.00

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