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Botryosphaeria obtusa is a plant pathogen that causes frogeye leaf spot, black rot and cankers on many plant species. [1] On the leaf it is referred to as frogeye leaf spot; this phase typically affects tree and shrubs. In fruit such as the apple, cranberry and quince, it is referred to as black rot, and in twigs and trunks it causes cankers. [1]
Bitter rot of apple management begins with good horticultural practices that includes the planting of trees that are less susceptible to bitter rot, the removal of infected fruit, dead twigs, and cankers during the dormant season, good horticultural practices to maintain the health and vigor of the tree, and training and pruning the tree to ...
Fungal diseases; Alternaria blotch Alternaria mali = A. alternata apple pathotype Alternaria rot Alternaria alternata: American brown rot Monilinia fructicola: Anthracnose canker and bull's-eye rot Pezicula malicorticus Cryptosporiopsis curvispora [anamorph] Apple scab: Venturia inaequalis Spilocaea pomi [anamorph] Apple ring rot and canker
Apple trees are susceptible to many diseases, and because pruning involves leaving open wounds from branch cuts, it's best to do so when the trees are dormant, says Ferguson.
It is a weak orchard pathogen and a cause of rubbery rot, also known as speck rot, in postharvest apples. First described in North Germany, it affects several apple varieties, including commercially important Jonagold and Elstar. Losses caused by P. washingtonensis during storage are usually below 1% but can reach 5–10% of apples. [2]
Cadophora malorum is a saprophytic plant pathogen that causes side rot in apple [3] and pear [4] and can also cause disease on asparagus [5] and kiwifruit. [6] C. malorum has been found parasitizing shrimp and other fungal species in the extreme environments of the Mid-Atlantic Ridge, and can be categorized as a halophilic psychrotrophic fungus [7] and a marine fungus.
Similarly to apple trees, crown rots of strawberries caused by P. cactorum can be partially diagnosed by cutting the crown of the plant and observing brown vascular tissues, and root rots by brown or black stunted roots. [7] Leather rot of strawberry is an additional disease affecting strawberry plants, with P. cactorum being the causal agent ...
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