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Diseases and pests of rhododendrons; Images of diseases and pests of rhododendrons This page was last edited on 20 March 2022, at 16:40 (UTC). Text is available ...
Pestalotia rhododendri is a fungal plant pathogen infecting azaleas and rhododendrons. [1] Important diseases: Pestalotiopsis tip blight of conifers, Gray leaf spot Pestalotia is primarily a secondary pathogen. It is saprophytic on dead and dying tissues and is weakly parasitic infecting wounds under moist conditions.
1 Fungal diseases. 2 Nematodes, parasitic. 3 References. Toggle the table of contents. ... This article is a list of diseases of azalea (Rhododendron spp.). Fungal ...
Ovulitis azaleae is a plant pathogen affecting azaleas and rhododendrons. ... List of azalea diseases; List of rhododendron diseases; References. External links
Rhododendron periclymenoides has low levels of toxicity, and all parts of the plant may cause vomiting or diarrhoea if ingested in quantity. [6] The poisons produced by rhododendrons are known as grayanotoxins, which are a class of neurotoxins. These neurotoxins work by blocking the inactivation of sodium channel receptors, causing cell ...
Major diseases include Phytophthora root rot, stem and twig fungal dieback. [60] Rhododendron bud blast, a fungal condition that causes buds to turn brown and dry before they can open, is caused by the fungus Pycnostysanus azaleae, which may be brought to the plant by the rhododendron leafhopper, Graphocephala fennahi. [61]: 562
Another method currently being used is controlling by culling Rhododendrons within diseased regions. [1] In 2008, an infected Rhododendron ponticum was found in Ireland. [3] More studies will need to be conducted in the spread and reproduction of this disease before more advanced chemical management methods become available. [13]
In addition to various Rhododendron species, mad honey can also be made from several other grayanotoxin-containing plants. Honey produced from the nectar of Andromeda polifolia contains high enough levels of grayanotoxin to cause full body paralysis and potentially fatal breathing difficulties due to diaphragm paralysis.