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Here's how to diagnose and correct the problem. ... Why Your Rhododendron's Leaves Are Rolling Up and Wilting (And What to Do About It) April 23, 2021 at 12:03 PM.
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
The primary symptom of P. ramorum on Rhododendron are leaf spots that expand into lesions. The lesions pierce through the plant tissue so that the spots are the same on both the top and bottom of the leaf. The lesions are usually triangular in shape and extend along the midvein. They can appear anywhere water collects on the surface of the leaf.
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 ...
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.
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.
Too much sunlight can also be a problem; it can cause leaves at the top of the plant to turn yellow or brown with sunscald. The solution: Peace lilies grow best in bright, ...