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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.
This article is a list of diseases of rhododendron (Rhododendron spp.). Bacterial diseases. Bacterial diseases; Crown gall Agrobacterium tumefaciens: Fungal diseases
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.
Rhododendron ponticum, called common rhododendron or pontic rhododendron, is a species of flowering plant in the Rhododendron genus of the heath family Ericaceae. It is native to the Iberian Peninsula in southwest Europe and the Caucasus region in northern West Asia .
Rhododendron thomsonii (半圆叶杜鹃) is a rhododendron species native to northern India, Bhutan, Nepal, Sikkim, and southern Tibet in China, where it grows at altitudes of 3,000–4,000 m (9,800–13,100 ft). It is a shrub that grows to 2–4 m in height, with leathery leaves that are oblong-elliptic to ovate or orbicular to obovate, 3–7 ...
Phytophthora ramorum is the oomycete known to cause the disease sudden oak death (SOD).The disease kills oak and other species of trees and has had devastating effects on the oak populations in California and Oregon, as well as being present in Europe.
Rhododendron columbianum is a shrub up to 2 m (6 ft 7 in) tall, spreading by means of underground rhizomes. The evergreen leaves are ovate to lanceolate , fragrant when crushed. Flowers are white to cream, borne in groups of 10 to 35. [ 4 ]
The main differences are the myrtle-leaved rhododendron shrub's smaller dimensions, hairy pedicels and paler flowers. [8] The two species diverged late, in the late Pliocene and/or Pleistocene. [9] The myrtle-leaved rhododendron is an endangered and protected relict species in Bulgaria, which is at the southern limit of its distribution area.