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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.
The disease is capable of killing some hosts, such as rhododendron, but most survive. Disease progression on these species is not well documented. Redwoods symptoms show purple lesions on sprouts and needle discoloration and cankers on small branches, which can lead to sprout mortality.
Rhododendron ponticum showing classic symptoms of Phytophthora kernoviae in the UK. Phytophthora (from Greek φυτόν (phytón), "plant" and φθορά (phthorá), "destruction"; "the plant-destroyer") is a genus of plant-damaging oomycetes (water molds), whose member species cause economic losses on crops worldwide, as well as environmental damage in natural ecosystems.
Leather rot of strawberry is an additional disease affecting strawberry plants, with P. cactorum being the causal agent. Symptoms of this disease include brown patches or green patches with a brown border in immature fruit, with infected mature fruit displaying a purple to brown color, and becoming hard, leathery, or even mummified.
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 ...
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 ...
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.