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White rot Botryosphaeria dothidea ... Viral diseases; Apple chlorotic leafspot genus Trichovirus, ... Hollow apple High temperature Internal bark necrosis = measles
The spots can then produce pycnidia which can separate this species of fungus from other possible leaf fungi. [1] Canker. On twigs, branches and trunks B. obtusa can infect where there has been a winter injury or fire blight cankers. Slightly sunken reddish/brown spots appear on the infected areas of bark. These then enlarge to form cankers ...
Botryosphaeria stevensii (Apple sphaeropsis) is a fungal plant pathogen that causes cankers on several tree species including apple and juniper as well as causing cankers on grape vines. [3] It causes branch dieback, possibly affecting a large portion of the tree canopy, and if severe it can kill entire plants. [4]
White rot, or "Bot rot", of apple is one of the many plant diseases that have been attributed to B. dothidea. [8] Recent analysis has confirmed the presence of B. dothidea, along with other Botryosphaeria species, on Malus sp.. [9]
The bracket fungus Fistulina hepatica is one of many that cause heart rot.. Heart rot is caused by fungi entering the trunk of the tree through wounds in the bark.These wounds are areas of the tree where bare wood is exposed and usually, a result of improper pruning, fire damage, dead branches, insects, or even animal damage.
Pages in category "Apple tree diseases" The following 47 pages are in this category, out of 47 total. This list may not reflect recent changes. * List of apple ...
The fungus attacks susceptible cultivars using a chemical toxin. [1] Affected plants exhibit circular spots on the leaves that enlarge as the disease advances. Normally, hyphae cannot adhere to the surface of the host, but under moist conditions light-grey mycelium might be present on the surface. [ 3 ]
The fungus grows as a thick, yellow crust on the underside of damaged apple tree branches, with dimensions of 3–20 cm (1–8 in) wide by 5–20 cm (2–8 in) long. The tightly-packed teeth are 5–12 mm (0.2–0.5 in) long and have tapered tips.