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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.
Botrytis leaf and petal blight Botrytis cinerea Botryotinia fuckeliana [teleomorph] Bud and twig blight Pycnostysanus azaleae = Briosia azaleae. Cercospora leaf spot Pseudocercospora handelii = Cercospora handelii. Chrysomyxa leaf rust Chrysomyxa ledi var. rhododendri Chrysomyxa piperiana Chrysomyxa roanensis. Clitocybe root rot (mushroom root rot)
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.
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.
Brown leaf tips can be a sign the leaves are drying out and the plant needs more humidity. Fix It: Spritz your peace lily’s leaves with water once a week. Put the peace lily in a bathroom where ...
The solution: You can remove old, yellow peace lily leaves with scissors or by pinching them off the plant with your fingers. This improves the look of your peace lily and redirects the plant’s ...
In warm weather, the leaf has a flat oblong shape. As the temperature of the leaf drops, the blade curls inward, giving the leaf a tubular, cigar-like shape. Research on Rhododendron leaf thermotropism suggests that the curling response might help prevent damage to cell membranes caused by rapid thawing after a freeze.
The leaves can be poisonous. Leaves are sclerophyllous, simple, alternate, and oblong (10 to 30 cm long, 5 to 8 cm wide). It retains its waxy, deep-green leaves for up to 8 years, but once shed are slow to decompose. It produces large, showy, white to purple flowers each June and July. [3] Bark of Rhododendron maximum