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Apple scab is a common disease of plants in the rose family that is caused by the ascomycete fungus Venturia inaequalis. [1] While this disease affects several plant genera, including Sorbus, Cotoneaster, and Pyrus, it is most commonly associated with the infection of Malus trees, including species of flowering crabapple, as well as cultivated apple.
Fungal diseases; Alternaria blotch Alternaria mali = A. alternata apple pathotype Alternaria rot Alternaria alternata: American brown rot Monilinia fructicola:
Cedar apple rust is caused by the fungi Gymnosporangium or more specifically Gymnosporangium juniperi-virginianae that spend part of their life cycles on Eastern Red Cedars growing near orchards. The complex disease cycle of cedar apple rust, alternating between two host plants, was first delineated by Anders Sandøe Ørsted .
Apple Scab, NYS IPM Tree Fruit Crops Fact Sheet Series (Revised), Wayne Wilcox Venturia inaequalis : Tom Volk's Fungus of the Month, September 2002 [4] Apple and Pear Scab, Keepers Nursery [5]
It can prevent damaged tree limbs from harming other branches and increase airflow between branches, reducing potential fungal diseases, says Eric North, program manager of urban forestry and ISA ...
Gymnosporangium is a genus of heteroecious plant-pathogenic fungi which alternately infect members of the family Cupressaceae, primarily species in the genus Juniperus (), and members of the family Rosaceae in the subfamily Amygdaloideae (apples, pears, quinces, shadbush, hawthorns, rowans and their relatives).
Apple trees are susceptible to fungal and bacterial diseases, and to damage by insect pests. Many commercial orchards pursue a program of chemical sprays to maintain high fruit quality, tree health, and high yields.
P. washingtonensis is a weak canker pathogen to apple trees, but while commercial trees in orchards don't seem to be at risk, crabapple pollinators can be susceptible. [3] The fungus causes small black dots (fruiting bodies) to form on infected twigs and tree branches.