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Fungal diseases; Armillaria root rot. Shoestring root rot Armillaria mellea Rhizomorpha subcorticalis [anamorph] Botryosphaeria dieback Botryosphaeria dothidea Fusicoccum aesculi [anamorph] Botrytis leaf and petal blight Botrytis cinerea Botryotinia fuckeliana [teleomorph] Bud and twig blight Pycnostysanus azaleae = Briosia azaleae. Cercospora ...
1 Fungal diseases. 2 Nematodes, parasitic. ... This article is a list of diseases of azalea (Rhododendron spp.). Fungal diseases ... Cercospora leaf spot
On the shrubs of Rhododendron, the disease starts with the blackening of the leaf petiole sometimes extending to the base of the leaf, affecting old and young leaves equally. [5] In addition to this darkening lesion on the stem, leaves can get severe enough lesions to become necrotic and cause entire leaf death. These lesions begin as a ...
Why Your Rhododendron's Leaves Are Rolling Up and Wilting (And What to Do About It) April 23, 2021 at 12:03 PM. Droopy or curled up foliage on this shrub is a sure sign your plant isn't happy ...
Azalea leafy gall can be particularly destructive to azalea leaves during the early spring. Hand picking infected leaves is the recommended method of control. [4] They can also be subject to Phytophthora root rot in moist, hot conditions. [5] Azaleas share the economically important disease Phytophthora cinnamomi with more than 3000 other plants.
Caused by the Ovulinia azaleae fungus, the disease develops during periods of moist weather at flowering time. Early- and late-flowering cultivars or species tend to escape the disease. The fungus overwinters as sclerotia on diseased petals adhering to plants, on the soil surface, or in leaf mulch under the bushes. [4]
Rhododendron periclymenoides is susceptible to problems caused by both insects and disease. Common insects which cause damage to R. periclymenoides are aphids, nematodes, borers, lace bug, mites and whitefly. Common diseases include crown and root rot, leaf spot and powdery mildew.
Ovulitis azaleae is a plant pathogen affecting azaleas and rhododendrons. ... List of azalea diseases; List of rhododendron diseases; References. External links